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Orderable Name CSTCE Cystatin C with Estimated Glomerular Filtration Rate (eGFR), Serum

Additional Codes

CNE Order Code: CSTCE


Specimen Required


Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged and serum aliquoted into a plastic vial within 2 hours of collection.


Useful For

Assessing kidney function in patients suspected of having kidney disease

 

Monitoring treatment response in patients with kidney disease

 

An index of glomerular filtration rate (GFR), especially in patients where serum creatinine may be misleading (eg, very obese, older adults, or malnourished patients)

 

Calculation of Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) cystatin C estimated GFR for patients where serum creatinine may be misleading (eg, very obese, older adults, or malnourished patients)

Method Name

Immunoturbidimetric

Specimen Type

Serum

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  7 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus Reject

Reference Values

CYSTATIN C:

18-49 years: 0.63-1.03 mg/L

≥50 years: 0.67-1.21 mg/L

0-17 years: Reference values have not been established. Refer to estimated glomerular filtration rate (eGFR).

 

ESTIMATED GFR:

>60 mL/min/BSA (body surface area)

Adult eGFR: Estimated GFR calculated using CKD-EPI Cystatin C equation.(1)

Pediatric eGFR: Estimated GFR calculated using Schwartz Cystatin C equation.(12)

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 to 3 days

CPT Code Information

82610

Forms

If not ordering electronically, complete, print, and send one of the following forms with the specimen:

-General Test Request (T239)

-Cardiovascular Test Request Form (T724)

-Renal Diagnostics Test Request (T830)