Labcorp cystatin c

Use. Since it is formed at a constant rate and freely filtered by the healthy kidney, cystatin C is a good marker of renal function. Serum concentrations of cystatin C are almost totally dependent on glomerular filtration rate (GFR). 1,2 A reduction in GFR causes a rise in the concentration of cystatin C.

Labcorp cystatin c. Cystatin C inversely correlates with the glomerular filtration rate (GFR), that is, elevated levels of cystatin C indicate decreased GFR. Cystatin C may provide more accurate assessment of GFR for very obese, older adults, or malnourished patients than creatinine. Cystatin C equation does not require patient ethnic data and can be used for ...

Recognizing that race is a social and not a biological construct, healthcare professionals and the public have called for removal of race in clinical algorithms. In response, the National Kidney Foundation and the American Society of Nephrology created the Task Force on Reassessing the Inclusion of …

The eGFR is an index of how well the kidneys are functioning. This can be calculated using serum creatinine (eGFRcreat) or serum Cystatin C (eGFRcys). While an eGFRcreat sees more use due to its measurement in common lab screening tests like the Kidney Profile, there are individuals where an eGFRcys may be more reliable, such as in those with:1,2.A new eGFR equation, the CKD-EPI 2021 eGFR creatinine-cystatin C equation without a race variable, was recommended for clinical use. 5,6 More recently, the Chronic Kidney Disease Prognosis Consortium reported that the use of the new eGFR creatinine-cystatin C equation had significantly greater discrimination of risk of kidney failure with ...What is the cystatin C test? The cystatin C test is a type of blood test to see how well your kidneys are working. Cystatin C is a protein made by cells in your …Cystatin C with Glomerular Filtration Rate, Estimated (eGFR) - Cystatin C is a non-glycosylated, low molecular weight (13,250 kD) cysteine proteinase inhibitor that is produced by all nucleated cells and found in body fluids, including serum. Since it is formed at a constant rate and freely filtered by the kidneys, its serum concentration is inversely …Webinar developed for health professionals Cystatin C is a protein used as a biomarker for kidney function. A cystatin C test may be ordered as an alternative to a serum creatinine or urine albumin test. Measurement of serum cystatin C is gaining a greater role in the estimation of kidney function, especially with growing scrutiny of the inclusion of race modifiers in the creatinine-based eGFR ...

Cystatin C inversely correlates with the glomerular filtration rate (GFR), that is, elevated levels of cystatin C indicate decreased GFR. Cystatin C may provide more accurate assessment of GFR for very obese, older adults, or malnourished patients than creatinine. Cystatin C equation does not require patient ethnic data and can be used for ... Cystatin C has been shown to be a reliable and accurate marker of kidney function across diverse populations. The 2012 Kidney Disease Improving Global Outcomes (KDIGO) guidelines recommended using cystatin C to confirm the diagnosis of chronic kidney disease (CKD) determined by creatinine-based estimated glomerular filtration …By using AccuDraw ® you understand that the tool provides guidance on the optimal draw for an adult patient of normal weight, on the day such guidance is issued. Specific instructions regarding the collection, handling, or shipping of specimens may vary from day-to-day, and should only be used on the day provided.Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate. 1 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio. 2,3 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood.Cystatin C is not a better estimator of GFR than plasma creatinine in the general population. Kidney Int 2010; 78: 1305-11. Grewel GS, Blake GM. Reference data for 51Cr-EDTA measurements of the GFR derived from live …Respective creatinine-based and cystatin C-based stages are shown in Fig 2 for all patients (Fig 2A) and subsets with borderline-high eGFRs (Fig 2B, within 5 mL/min/1.73 m 2 of an earlier stage) and borderline-low eGFRs (Fig 2C, within 5 mL/min/1.73 m 2 of a later stage). Of all patients, the percentages that were changed to a later stage ...Purpose of review: The goal of this update is to raise awareness of clinical scenarios where cystatin C has clear and immediate benefits as an alternative glomerular filtration rate (GFR) biomarker to supplement creatinine. An additional goal is to focus the estimated GFR (eGFR) controversy onto medication prescribing for agents with narrow therapeutic …

Clinical Significance. Cystatin C with Glomerular Filtration Rate, Estimated (eGFR) - Cystatin C is a non-glycosylated, low molecular weight (13,250 kD) cysteine proteinase inhibitor that is produced by all nucleated cells and found in body fluids, including serum. Since it is formed at a constant rate and freely filtered by the kidneys, its ...Labcorp is a leading provider of medical laboratory services, offering a wide range of tests and screenings to help individuals maintain their health and well-being. Labcorp has nu...Cystatin-based - Estimating Glomerular Filtration Rate in Kidney Transplantation: A Comparison between Serum Creatinine and Cystatin C-Based Methods, J Am Soc Nephrol 16: 3763–3770, 2005. This study demonstrates a comparison between the cystatin C–based prediction equations of Le Bricon, Filler, Hoek, and Larsson with the conventional ...Labcorp Oklahoma, Inc. Test Directory. Home; Test Directory; Cystatin C with Estimated GFR; ... Print Test Information . Cystatin C with Estimated GFR. Order Name CYSTC Revision Date 12/05/2019. Test Name Methodology LOINC Code; Cystatin C with Estimated GFR SPECIMEN REQUIREMENTS; Specimen: Specimen Volume (min) …

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A well-designed menu is another way to tempt your customers, take a look at these menu maker options for your restaurant to make that happen. Restaurant menus A well-designed resta...Cystatin C. ORDER CODE: CYSTC. tabs. false. « Back To Search. ORDERING. SPECIMEN. PROCESSING. RESULTS. Test Code. SHC TEST CODE, LPCH TEST CODE. LABCYSTC ...Creatinine and cystatin C are endogenous markers used in the estimation of GFR 3. Creatinine is a convenient and inexpensive marker for GFR but is affected by age, gender, exercise, muscle mass, and diet 4. One of the most widely used assessment methods for GFR is the 24-hour creatinine clearance (CrCl).Dec 26, 2023 · Stage 3b CKD (eGFR 30-44 mL/min): This stage is marked by moderate to severe loss of kidney function. Symptoms like fatigue, poor appetite and high blood pressure may begin to appear at this stage. Stage 4 CKD (eGFR 15-29 mL/min): At this stage, there is severe loss of kidney function and typically more pronounced symptoms.

Limitations. With reduced renal blood flow, creatinine rises less quickly than urea nitrogen. Concentration of creatinine only becomes abnormal when about half or more of the nephrons have stopped functioning in chronic progressive renal disease. Antibiotics containing cephalosporin lead to significant false-positive values if samples are drawn ... Your Cystatin c level of 1.37 is a High Cystatin c level. High Cystatin c levels could indicate health issues. Typically, levels between 0.62 mg/L to 1.03 mg/L suggest no concerns. However, deviations from this range warrant prompt medical attention. Consulting a doctor for abnormal levels is advisable. Making an appointment with LabCorp online is a simple and convenient way to get the medical testing you need. Whether you’re looking for a routine checkup or need to get tested for...Creatinine and cystatin C are endogenous markers used in the estimation of GFR 3. Creatinine is a convenient and inexpensive marker for GFR but is affected by age, gender, exercise, muscle mass, and diet 4. One of the most widely used assessment methods for GFR is the 24-hour creatinine clearance (CrCl).Cystatin C and creatinine were available in 1966 patients at randomization. Median (interquartile range) eGFR difference was -0.7 (-6.4-4.8) mL/min/1.73 m2. Compared to creatinine, creatinine-cystatin led to a substantial reclassification of chronic kidney disease stages. Overall, 212 (11%) and 355 (18%) patients were reallocated to a …Calculate glomerular filtration rate in patients for whom serum creatinine may be misleading, such as the very obese, elderly, or malnourished patients. ||Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.4 mL) …LabCorp: $169 21-Hydroxylase Antibody. Adrenal 21 Hydroxylase Autoantibodies ... Cystatin C . Quest: N/A LabCorp: $119 Quest: $65 LabCorp: $69 Cytomegalovirus (CMV ... This is a single-marker test measuring cystatin C. Alternative Testing Options To The Top Vibrant America & Vibrant Wellness Tests Starting Feb. 1st 2024, Vibrant is closing off all partnerships and moving in a different strategic direction. An estimated 37 million adults have CKD but nearly 90% are unaware. < 30% with diabetes & only 10% with hypertension receive guideline-concordant assessment. CKD is a disease multiplier - nearly 50% with CKD die from CVD before reaching ESRD. Adverse outcomes: heart failure, coronary artery disease & premature cardiovascular death.This is a single-marker test measuring cystatin C. Please be advised that Boston Heart Diagnostics policy states that practitioners cannot order labs on themselves or their immediate family members. Sample Report. Patient Collection Instructions. Cystatin C. Estimated Glomerular Filtration Rate. This is a single-marker test measuring cystatin C.Calculate glomerular filtration rate in patients for whom serum creatinine may be misleading, such as the very obese, elderly, or malnourished patients. ||Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.4 mL) …Your Cystatin c level of 1.37 is a High Cystatin c level. High Cystatin c levels could indicate health issues. Typically, levels between 0.62 mg/L to 1.03 mg/L suggest no concerns. However, deviations from this range warrant prompt medical attention.

In this review and update, we summarize the overall literature on cystatin C, critically evaluate recent high-impact studies, highlight the role of cystatin C in recent kidney disease guidelines, and suggest a practical approach for clinicians to incorporate cystatin C into practice. We conclude by addressing frequently asked questions related ...

However, an analysis of data from Labcorp suggests that the number of cystatin C tests increased between 2012 and 2019 , but cystatin C tests are still orders of magnitude less common than creatinine tests, he noted. For example, in 2018, laboratories conducted approximately 110,000 cystatin C tests compared with about 39 million …Cystatin C is produced by all nucleated cells; hence, it is less affected by muscle 4 than creatinine and is freely filtered by the glomeruli. 5. Although differences in associations of serum creatinine and cystatin C with clinical outcomes are fairly well understood, differences within individuals have been less studied.As of 2015, LabCorp customers can find the nearest company location by using the Find a Lab tool found on the company’s website. The LabCorp Find a Lab tool uses the customer’s add...Nov 9, 2021 ... Cystatin C is a relatively small protein that is filtered from the blood by the kidneys and broken down at a constant rate. A cystatin C ...Labcorp Cystatin C Brochure. Combined Cystatin C and Creatinine eGFR - For Improved CKD Diagnosis and Management. Peer-Reviewed Publication in Diabetes Care . Chronic Kidney Disease Testing Among At-Risk Adults in the U.S. Remains Low: Real-World Evidence From a National Laboratory Database.eGFR Calculator. Glomerular filtration rate (GFR) is the best overall index of kidney function. Normal GFR varies according to age, sex, and body size, and declines with age. The National Kidney Foundation (NKF) and the American Society of Nephrology (ASN) convened a Task Force in 2021 to focus on the use of race when estimating GFR.Measurement of serum creatinine and cystatin C are more convenient and rapid tests for evaluating kidney function. Especially for within-individual monitoring, both are reliable …Get ratings and reviews for the top 12 foundation companies in Union City, CA. Helping you find the best foundation companies for the job. Expert Advice On Improving Your Home All ...

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Cystatin C is considered to be a preferred, unbiased marker to serum creatinine for estimating GFR and is independent of diet, protein intake, ethnicity, sex, physical activity …Set up: Mon-Sat; Report available: 1-3 days. Reference Range. See Laboratory Report. Clinical Significance. Cystatin C is a non-glycosylated, low …Stage 3b CKD (eGFR 30-44 mL/min): This stage is marked by moderate to severe loss of kidney function. Symptoms like fatigue, poor appetite and high blood pressure may begin to appear at this stage. Stage 4 CKD (eGFR 15-29 mL/min): At this stage, there is severe loss of kidney function and typically more pronounced symptoms.Cystatin C (component) Stores: EconoLabs, LifeExtension, RequestATest, Walk-In Lab Components: Cystatin C 20 laboratory tests found. $148.00 ... We would like to show you a description here but the site won’t allow us. Cystatin C inversely correlates with the glomerular filtration rate (GFR), that is, elevated levels of cystatin C indicate decreased GFR. Cystatin C may provide more accurate assessment of GFR for very obese, older adults, or malnourished patients than creatinine. Cystatin C equation does not require patient ethnic data and can be used for ... Cystatin C (CYSC) analysis Assay. ... Labcorp is a leading global life sciences company that includes contract research and developmental services to the ... Labcorp exam details for Cystatin CENTURY. Clients & Individuals (Press Type or Space to Go to Landing Page or Press Down till expand Menu) Patients & People expand menuBlood should be collected in a blue-top tube containing 3.2% buffered sodium citrate. 1 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio. 2,3 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood.Labcorp is dedicated to helping increase patient and provider awareness about chronic kidney disease. Working with the National Kidney Foundation, we believe testing as early as possible can help inform treatment decisions—helping slow or stop the progression of the disease and reducing the likelihood of cardiovascular and kidney complications. ….

Under Article Text revised title to Lab: Cystatin C Measurement. Formatting and punctuation were corrected throughout the article. 10/29/2020. R2. Under CMS National Coverage Policy added regulation CMS Internet-Only Manual, Pub 100-02, Medicare Benefit Policy Manual, Chapter 15, §80.0, §80.1.1, and §80.1.2.Cystatin C has been proposed as a useful biomarker of early impaired kidney function and a predictor of mortality risk. The present study is to investigate the association between serum Cystatin C and the severity of coronary artery lesions, Gensini score (GS), and the risk of coronary artery disease (CAD).A total of 682 CAD patients (230 females, …Labcorp is proud to offer the CKD-EPI eGFR creatinine-cystatin C (eGFRcr-cys) calculation without race that has been shown to more accurately estimate measured …Protein:creatinine ratio in a first-morning or random untimed "spot" urine specimen is recommended testing to ascertain chronic kidney disease. 1 It is also used to evaluate nephrotic syndromes; work up other renal diseases, including malignant hypertension, glomerulonephritis, Goodpasture syndrome, cryoglobulinemia, toxemia of pregnancy, drug ...Cystatin C test cost max is in EconoLabs (Cystatin C) with price $250.00. This laboratory test is available in 4 online lab test stores. pH Urine-Color Appearance WBC Esterase Protein Glucose Ketones Occult Blood Bilirubin Urobilinogen,Semi-Qn Nitrite, Urine Microscopic Examination WBC RBC Epithelial Cells (non renal) Epithelial Cells (renal ...This is a single-marker test measuring cystatin C. Alternative Testing Options To The Top Vibrant America & Vibrant Wellness Tests Starting Feb. 1st 2024, Vibrant is closing off all partnerships and moving in a different strategic direction.His estimated glomerular filtration rate (eGFR) was calculated using 3 equations that incorporated creatinine (eGFRcr), cystatin C (eGFRcys), and both creatinine and cystatin C (eGFRcr-cys), as shown in Table 2. An 80-year-old man with type 2 diabetes and hypertension was referred to the nephrology clinic for persistent hyperkalemia.Use. Test for acute myocardial infarct and for skeletal muscular damage; elevated in some patients with myxedema (hypothyroidism), malignant hyperthermia syndrome, and muscular dystrophy. CK is a marker for Duchenne muscular dystrophy, with elevations of 20 to 200 times normal. 1 CK is increased in female carriers of this X-linked disease, and ...Creatinine and cystatin C are endogenous markers used in the estimation of GFR 3. Creatinine is a convenient and inexpensive marker for GFR but is affected by age, gender, exercise, muscle mass, and diet 4. One of the most widely used assessment methods for GFR is the 24-hour creatinine clearance (CrCl).A new eGFR equation, the CKD-EPI 2021 eGFR creatinine-cystatin C equation without a race variable, was recommended for clinical use. 5,6 More recently, the Chronic Kidney Disease Prognosis Consortium reported that the use of the new eGFR creatinine-cystatin C equation had significantly greater discrimination of risk of kidney failure with ... Labcorp cystatin c, If kidney function declines, the blood concentration rises. Cystatin C is a small protein that is produced by all cells that contain a nucleus (i.e. the majority of cells in the body). In healthy people, it is produced and destroyed at a constant rate and is found in a variety of body fluids such as blood, spinal fluid, and breast ..., Dec 26, 2023 · Stage 3b CKD (eGFR 30-44 mL/min): This stage is marked by moderate to severe loss of kidney function. Symptoms like fatigue, poor appetite and high blood pressure may begin to appear at this stage. Stage 4 CKD (eGFR 15-29 mL/min): At this stage, there is severe loss of kidney function and typically more pronounced symptoms. , Results for legacy customers who used Gold Connect in the past. Login >. , For IndividualsPatient PortalGet test results, change lab appointments and pay bills. Login > For Healthcare ProfessionalsLabcorp LinkOrder tests, get collection details and view clinical decision-making insights. Login > , Specialty Oncology & Genetics Portals ..., Apr 21, 2023 · The renal handling of cystatin C differs from creatinine. While both are freely filtered by glomeruli, once it is filtered, cystatin C, unlike creatinine, is reabsorbed and metabolized by the proximal renal tubules. Thus, under normal conditions, cystatin C does not enter the final excreted urine to any significant degree. , Published September 23, 2021. N Engl J Med 2021;385: 1737 - 1749. DOI: 10.1056/NEJMoa2102953. VOL. 385 NO. 19. Abstract. Background. Current equations …, 0095229. Cystatin C, Serum with Reflex to Estimated Glomerular Filtration Rate (eGFR) CYSTAT C. Choose the Right Test. ARUP Consult® assists with test selection and …, Cystatin C (mg/L). Logistics. Test Indications: An index of glomerular filtration rate, especially in patients where serum. creatinine may be misleading (eg, very obese, elderly, or malnourished. patients). Assessing renal function in patients suspected of having., Methods: We diluted cystatin C ERM-DA471/IFCC (5.48 mg/L) into buffer and compared results with predicted ones. We then updated the cystatin C application on our BN II nephelometer to provide results based on pre-IFCC and IFCC calibrations of CKiD specimens simultaneously. We assayed 51 previously analyzed sera and 62 fresh additional specimens., Cystatin C has been shown to be a reliable and accurate marker of kidney function across diverse populations. The 2012 Kidney Disease Improving Global Outcomes (KDIGO) guidelines recommended using cystatin C to confirm the diagnosis of chronic kidney disease (CKD) determined by creatinine-based estimated glomerular filtration rate (eGFR) and to ..., His estimated glomerular filtration rate (eGFR) was calculated using 3 equations that incorporated creatinine (eGFRcr), cystatin C (eGFRcys), and both creatinine and cystatin C (eGFRcr-cys), as shown in Table 2. An 80-year-old man with type 2 diabetes and hypertension was referred to the nephrology clinic for persistent hyperkalemia., An estimated 37 million adults have CKD but nearly 90% are unaware. < 30% with diabetes & only 10% with hypertension receive guideline-concordant assessment. CKD is a disease multiplier - nearly 50% with CKD die from CVD before reaching ESRD. Adverse outcomes: heart failure, coronary artery disease & premature cardiovascular death., The consequences of subclinical thyroid disease (serum TSH 0.1−0.45 μIU/mL or 4.5−10.0 μIU/mL) are minimal and current guidelines recommend against routine treatment of patients with TSH levels in these ranges, but thyroid function tests should be repeated at 6- to 12-month intervals to monitor TSH levels; 8 however, treatment of subclinical …, In addition, Labcorp is also enhancing test panels that provide convenient combinations of current test offerings to include an updated eGFR calculation, using both creatinine and cystatin C. Those profiles will be available during the second quarter of 2022 and should better help health care professionals make better decisions for the patients ..., Cystatin C Test Normal Range. The normal range of cystatin C is around 0.62 – 1.15 mg/L. Values can vary between laboratories. Generally, higher cystatin C levels point to poor kidney function . Advantages and Disadvantages over Creatinine Pros. Cystatin C can be used as a replacement for blood creatinine for the assessment of kidney function., The accuracy of GFR equations that use cystatin C (eGFRcys) or creatinine-cystatin C (eGFRcr-cys) is not well studied in these populations. Study Design. A systematic review of original articles identified from PubMed and expert sources. Two reviewers screened articles independently and identified those meeting inclusion criteria., Cystatin C is produced by all nucleated cells; hence, it is less affected by muscle 4 than creatinine and is freely filtered by the glomeruli. 5. Although differences in associations of serum creatinine and cystatin C with clinical outcomes are fairly well understood, differences within individuals have been less studied., Cystatin-C-based eGFR is biased by numerous chronic kidney disease (CKD)-associated risk factors, including BMI, hypertension and C-reactive protein level. Although cystatin C is a better ..., Cystatin C (mg/L). Logistics. Test Indications: An index of glomerular filtration rate, especially in patients where serum. creatinine may be misleading (eg, very obese, elderly, or malnourished. patients). Assessing renal function in patients suspected of having., With the recent advances in technology, electronic access to health records has become the new standard for both patients and doctors alike. LabCorp patient portal allows electroni..., LabCorp is one of the largest clinical laboratory networks in the United States, offering a wide range of medical testing services. To make it convenient for patients to access the..., Abstract. Purpose of review: The goal of this update is to raise awareness of clinical scenarios where cystatin C has clear and immediate benefits as an alternative glomerular filtration rate (GFR) biomarker to supplement creatinine. An additional goal is to focus the estimated GFR (eGFR) controversy onto medication prescribing for agents with ... , Vacutainer® gray-top urine culture transport tube with preservative (preferred). If less than 4 mL of urine is collected, usually from pediatric and geriatric patients or from a catheter, submit refrigerated in a sterile, screw cap container or tube. Do not submit low volume urine specimens in underfilled gray top tubes., As of 2015, LabCorp customers can find the nearest company location by using the Find a Lab tool found on the company’s website. The LabCorp Find a Lab tool uses the customer’s add..., Use of cystatin C in addition to creatinine to estimate glomerular filtration rate (estimated glomerular filtration rate based on cystatin C [eGFRcys] and estimated glomerular filtration rate based on creatinine [eGFRcr], respectively) is increasing. When eGFRcr and eGFRcys are discordant, it is not known which is more accurate, leading to uncertainty in clinical decision making., Here's how you should interview the company interviewing you. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners. I agree to Money's Te..., Use of cystatin C in addition to creatinine to estimate glomerular filtration rate (estimated glomerular filtration rate based on cystatin C [eGFRcys] and estimated glomerular filtration rate based on creatinine [eGFRcr], respectively) is increasing. When eGFRcr and eGFRcys are discordant, it is not known which is more accurate, leading to uncertainty in clinical decision making., Respective creatinine-based and cystatin C-based stages are shown in Fig 2 for all patients (Fig 2A) and subsets with borderline-high eGFRs (Fig 2B, within 5 mL/min/1.73 m 2 of an earlier stage) and borderline-low eGFRs (Fig 2C, within 5 mL/min/1.73 m 2 of a later stage). Of all patients, the percentages that were changed to …, May serve as a reasonable alternative to the multivariate cystatin C equation when there is a concern about one of the major variables (height, Scr, or cystatin C.) In most cases, the Bedside Schwartz equation [0.413*(ht/cm/Scr)] allows rapid and reasonably accurate estimation of GFR for clinical use in children with CKD., Cystatin C is a highly sensitive and specific marker of glomerular filtration rate (renal function). Cystatin C is independent of muscle mass, age, and body mass index. Cystatin C is also used to assess renal allograft function. CPT Code(s) 82610: Lab Section: Immunology - Serology Test Directory Service provided by Labcorp Oklahoma, Inc., Conclusions: Higher creatinine-to-cystatin-C ratios indicate better health status and are strongly associated with lower mortality risk regardless of the kidney function level, and …, In this cross-sectional study, we looked into the relation between serum Cystatin C levels and cognition in a group of U.S. older adults. Method: The data of this study were from the National Health and Nutrition Examination Survey (NHANES) 1999-2002. A total of 4,832 older adults aged ≥60 who met the inclusion criteria were included., CYSTATIN C. Test ID: Q0283. CPT code: 82610. LOINC: 33863-2. Specimen Type: red gel. Frequency: Mon – Fri; analytic time 2 days. Instructions: Overnight fasting preferred. Refrigerated serum from SST 1.0mL (0.5 mL min) Separate serum or plasma from cells ASAP or w/in 2 hours of collection. Text: Cystatin C is a highly sensitive and specific ..., Cystatin C is a marker of renal function that is not affected by muscle mass and nutrition. Learn how to collect, store, and send serum or plasma samples for this test, and see the …