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.

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.

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