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Myoglobin, Urine
Test Code661
CPT Codes
83874
Preferred Specimen
4 mL random urine submitted in a myoglobin transport tube
Minimum Volume
4 mL
Instructions
Add exactly 4 mL random urine to a Myoglobin transport tube within one hour of collection. Freeze and ship frozen. (Transport tube, product# 177447, is 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.
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.
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 72 hours
Frozen: 72 hours
Refrigerated: 72 hours
Frozen: 72 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received in a non-Myoglobin transport tube • Specimen received past stability • pH <8.0 • Timed urine • More than 4 mL urine in Myoglobin transport tube • Received room temperature
Methodology
Nephelometry
Setup Schedule
Night
Clinical Significance
The breakdown of skeletal muscle (rhabdomyolysis) releases myoglobin. Very high concentrations of myoglobin may increase the risk of acute renal failure.