Myoglobin, Urine

Test Code
661

CPT Codes
83874<br /> **This test is not available for New York patient testing. For New York patient testing, please use test code 901534.**

Preferred Specimen
Minimum: 4 mL urine submitted in a Myoglobin Transport tube

Instructions
Add exactly 4 mL random urine to a Myoglobin Transport tube, within 1 hour of collection. Freeze and ship frozen. (Transport tube# 177447 available through Client Supply).

Exactly 4 mL of urine in the Myoglobin Transport tube is required to achieve the required pH of >8.0; more than 4 mL of urine will lower the pH outside acceptable range.

Note: Myoglobin in urine is very unstable unless the pH is between 8.0 and 9.0

Transport Temperature
Frozen

Specimen Stability
Room temperature: Unacceptable
Refrigerated: 72 hours
Frozen: 72 hours

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimen received in a non-Myoglobin Transport tube • More than 4 mL urine in Myoglobin Transport tube • Specimen received room temperature • Specimen received past stability • pH <8.0 • Timed urine

Methodology
Nephelometry

Setup Schedule
Set up: Mon-Sat evening; Report available: 1-2 days

Reference Range
<28 mcg/L

Clinical Significance
The breakdown of skeletal muscle (rhabdomyolysis) releases myoglobin. Very high concentrations of myoglobin may increase the risk of acute renal failure.



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.