Creatinine, Serum

Test Code

CREAT

Alias/See Also

Epic: LAB66

Preferred Specimen

Specimen Type: Serum
Collection Container: Serum gel
Specimen Volume: 3 mL

Minimum Volume

0.10 mL

Other Acceptable Specimens

Specimen Type: Plasma
Collection Container: Green top (Lithium heparin)

Instructions

Centrifuge and separate cells after clot formation and within 4 hours of collection

Transport Container

Plastic vial

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 3 months

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Unlabeled, mislabeled, wrong tube type, QNS, hemolysis

Methodology

Kinetic Alkaline Picrate (Jaffe Reaction).

Setup Schedule

Daily

Report Available

Same day

Limitations

For serum, hemolysis increase results by up to 4%. Bilirubin may decrease results by 2%. Intralipid can increase results by up to 6%.

Reference Range

0-7 days	0.6-11.1 mg/dL
7 days-1 month	0.3-0.7 mg/dL
1 month-1 year	0.2-0.4 mg/dL
1-18 years	0.3-1.0 mg/dL
18-150 years	Male:	0.7-1.3 g/dL
	Female:	0.6-1.0 g/dL

Clinical Significance

Creatinine is eliminated from blood by glomerular filtration. Reduced renal function results in an increased serum creatinine concentration. Measurement of serum creatinine is used to diagnose and monitor acute and chronic renal disease and estimate glomerular filtration rate.

Performing Laboratory

Inova Laboratories

2832 Juniper Street

Fairfax, VA 22031

Last Updated: March 6, 2023
Last Review: N. Wolford, March 6, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.