Feb 5, 2018




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry


Creatinine (CRET) Chemistry Lab Test

Name: Creatinine

Test Name: Creatinine

Health Link Test Code: CRET

LIS Test Code: CRET

CPT Code(s): 82565

Test Component:

Creatinine and estimated Glomerular Filtration Rate (e-GFR)- calculated for adult outpatients

Included In: Basic Metabolic Panel, Comprehensive Metabolic Panel, and Creatinine Clearance Package

Methodology: Enzymatic

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Green cap with yellow ring (PST)

Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: 1 mL

Pediatric Collection Volume: 0.4 mL

Stability Ambient:

7 days

Stability Refridgerated:

7 days

Stability Frozen:

3 months

Sample Analyzed: Plasma or serum

Testing Volume: 0.5 mL

Pediatric Testing Volume: 0.2 mL

Specimen Processing:

Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Refrigerate.

Specimen Transport:

Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.






 0 days-1 month  0.30-0.90  0.30-0.90
 2 months-2 years  0.15-0.40  0.15-0.40
 3 years-6 years  0.25-0.50  0.25-0.50
 7 years-10 years  0.30-0.65  0.30-0.65
 11 years-14 years  0.40-0.80  0.40-0.80
 15 years and up







 18 years and up:  60-120 mL/min/1.73 sqm
 e-GFR Interpretive Statement:
   Chronic kidney disease:  e-GFR < 60 mL/min/1.73 sqm
   Kidney failure:  e-GFR < 15 mL/min/1.73 sqm


 * For African-Americans multiply reported e-GFR result by 1.159.


Interpretation Type: Reference Interval

Test Limitations:

Very rarely unreliable results (i.e. pseudohypercreatininemia) secondary to occurrence of monoclonal protein have been described in patients affected by Waldenstrom's macroglobulinemia (only IgM type) or by monoclonal gammopathy of unknown significance (IgG or IgM).

Additional Information:

Estimated Glomerular Filtration Rate calculation uses the CKD-EPI National Kidney Foundation calculation for IDMS creatinine methods. See the following website for this calculation:  http://www.kidney.org/professionals