Calculate glomerular filtration rate in patients for whom serum creatinine may be misleading, such as the very obese, elderly, or malnourished patients.
Within 24 hours
Serum Separator Tube (SST), Plasma Separator Tube (PST), or Green (Lithium or Sodium Heparin).
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)
Grossly hemolyzed specimens.
After separation from cells: Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 3 months
Effective May 20, 2019
|Cystatin C||0.5 - 1.2 mg/L|
|eGFR by Cystatin C||
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.
|Component Test Code*||Component Chart Name||LOINC|