Ordering Recommendation

Calculate glomerular filtration rate in patients for whom serum creatinine may be misleading, such as the very obese, elderly, or malnourished patients.

Mnemonic
CYSTAT C
Methodology

Quantitative Nephelometry

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Serum Separator Tube (SST), Plasma Separator Tube (PST), or Green (Lithium or Sodium Heparin).

Specimen Preparation

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)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Grossly hemolyzed specimens.

Remarks
Stability

After separation from cells: Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 3 months

Reference Interval

Effective May 20, 2019

Test Number
Components
Reference Interval
  Cystatin C 0.5 - 1.2 mg/L
  eGFR by Cystatin C
Age
Reference Interval
17 years or less Calculation not reported
18 years and greater Stage Description eGFR Range (mL/min/BSA)
1 Normal or increased eGFR 90 or greater
2 Mildly decreased eGFR 60 - 89
3 Moderately decreased eGFR 30 - 59
4 Severely decreased eGFR 15 - 29
5 Kidney Failure Less than 15

Interpretive Data



Compliance Category

FDA

Note

If the patient's age is either unknown or is 18 years or greater, then Cystatin C Reflex will be added at no additional charge.

Hotline History
N/A
CPT Codes

82610

Components
Component Test Code* Component Chart Name LOINC
0095228 Cystatin C 33863-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
Cystatin C, Serum with Reflex to Estimated Glomerular Filtration Rate (eGFR)