Sign in →

Test Code CRGFB Creatinine, Serum/Plasma, w/ GFR

Additional Codes

EPIC:  LAB30113

Methodology

Enzymatic. (Isotope Dilution Mass Spectrometry (IDMS) Traceable Creatinine Standardization)

Includes calculated glomerular filtration rate (GFR) calculation

 

Used in the diagnosis and treatment of renal diseases, in monitoring renal dialysis, and as a calculation basis for measuring other urine analytes.

Performing Laboratory

St. Joseph Hospital

Specimen Requirements

Submit only 1 of the following specimens:

Preferred:  Plasma
Draw blood in a light green-top (lithium heparin gel) tube(s). Spin down, separate plasma from cells within 2 hours of draw, and send 1 mL of lithium heparin plasma refrigerated.

Note:  1. Indicate plasma on request form.

2. Label specimen appropriately (plasma).

Alternate:  Serum

Draw blood in a plain, red-top tube(s) or a serum gel tube(s). Spin down, separate serum from cells within 2 hours of draw, and send 1 mL of serum refrigerated.

Note:  1. Indicate serum on request form.

2. Label specimen appropriately (serum).

Reference Values

Males:  0.67 - 1.17 mg/dL

Females:  0.51 - 0.95 mg/dL

 

GFR:  > 60 mL/min

 

Critical value:  > 4.0 mg/dL (males and females; outpatients only)

Day(s) Test Set Up

Monday through Sunday

Available STAT

Test Classification and CPT Coding

82565