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Creatinine - Blood

Source Blood
 
Mnemonic CREA
 
Specimen Requirements

1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL heparinized plasma or serum

Minimum Whole Blood Volumes for Micro-Collections using Microtainers
 
Specimen Handling
Additional Information

Glomerular filtration rate (GFR) is the best indicator of kidney function and, in adults, can be easily and accurately estimated using the modified MDRD GFR equation. This formula uses the patient's age and sex with the measured blood creatinine value to accurately estimate GFR, allowing patients with earlier stages of kidney disease to be identified.

Creatinine laboratory reports for all adult outpatients will include a report of GFR estimated by the MDRD equation.

The calibration of the creatinine method used is IDMS-traceable.

 

Testing Location Chemistry-All Sites
Testing Frequency Daily

 
Alternate Name(s)
Reference Interval

Age

Male

Female

Units

1 d-5 years

20-60

20-60

µmol/L

6-12 years

30-70

30-70

µmol/L

13-14 years

40-85

40-85

µmol/L

15-150 years

50-120

35-100

µmol/L

Click here for critical values.