Cystatin C with Glomerular Filtration Rate, Estimated (eGFR)

Cystatin C with Glomerular Filtration Rate, Estimated (eGFR)

Test Code

94588
82610
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
94588
82610
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection may be available in your area for purchase through Quest Mobile.

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 serum concentration is inversely correlated with the glomerular filtration rate (GFR); that is,high values indicate low GFRs while lower values indicate higher GFRs, similar to creatinine. The renal handling of cystatin C differs from creatinine. While both are freely filtered by glomeruli, once it is filtered, cystatin C, unlike creatinine, ...

Test Resources

Test Guide

Laboratory Testing for Chronic Kidney Disease Diagnosis and Management

Test Guide

Laboratory Testing for Diabetes Diagnosis and Management

Test Summary

Cystatin C with Glomerular Filtration Rate, Estimated (eGFR)

Test Details

Methodology

Particle Enhanced Turbidimetric Immunoassay (PETIA)

Reference Range(s)

See Laboratory Report

Alternative Name(s)

CysX, CysC

LOINC® Codes, Performing Laboratory

Service Area must be determined

Methodology

Particle Enhanced Turbidimetric Immunoassay (PETIA)

Reference Range(s)

See Laboratory Report

Alternative Name(s)

CysX, CysC
Service Area must be determined

Preferred Specimen(s)

1 mL serum

Minimum Volume

0.5 mL

Transport Container

Transport tube

Transport Temperature

Room temperature

Specimen Stability

  • Room temperature: 14 days
    Refrigerated: 14 days
    Frozen: 30 days

Setup Schedule

Service Area must be determined
1 mL serum
0.5 mL
Transport tube
Room temperature
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 30 days
Service Area must be determined
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection may be available in your area for purchase through Quest Mobile.
Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

The tests listed by specialty and category are a select group of tests offered. For a complete list of Quest Diagnostics tests, please adjust the filter options chosen, or refer to our Directory of Services.

Customize the test information for your Service Area