Creatinine

Test Code

38448

CPT Codes
82565<br>Limited Access Code

Preferred Specimen

1 mL plasma collected in a plasma separator tube

Minimum Volume

0.5 mL

Instructions

Centrifuge plasma specimens within 1 hour of collection, transfer plasma to a sterile, plastic screw-capped vial(s), ship at room temperature.

Transport Container

Sterile, plastic screw-cap vial

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

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

Unspun plasma separator tube; Unspun green-top tube (heparinized plasma not separated from cells); Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate; Grossly icteric; Anticoagulants other than heparin

Methodology
Spectrophotometry

Setup Schedule

Set up: Daily; Report available: 1-2 days

Reference Range

Age	Male (mg/dL)	Female (mg/dL)
0-2 days	0.79-1.58	0.79-1.58
3-27 years	0.35-1.23	0.35-1.23
1 month-9 years	0.20-0.73	0.20-0.73
10-12 years	0.30-0.78	0.30-0.78
13-15 years	0.40-1.05	0.40-1.00
16-17 years	0.60-1.20	0.50-1.00
18-19 years	0.60-1.24	0.50-0.96
20-29 years	0.60-1.24	0.50-0.96
30-39 years	0.60-1.26	0.50-0.97
40-49 years	0.60-1.29	0.50-0.99
50-59 years	0.70-1.30	0.50-1.03
60-69 years	0.70-1.35	0.50-1.05
70-79 years	0.70-1.28	0.60-1.00
> or = 80 years	0.70-1.22	0.60-0.95

Clinical Significance

Serum creatinine is useful in the evaluation of kidney function and in monitoring renal dialysis. A serum creatinine result within the reference range does not rule out renal function impairment: serum creatinine is not sensitive to early renal damage, since it varies with age, gender, and ethnic background. The impact of these variables can be reduced by an estimation of the glomerular filtration rate, using an equation that includes serum creatinine, age, and gender.

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.