Send on ice.
Fresh random urine. No preservative.
Alkalinise dropwise with 5M NaOH to pH 8-9.Centrifuge specimen and analyse immediately if possible - or store frozen.
Urine must be alkalinised to pH 8-9. Send frozen
Mon - Sun, 24hrs
< 3 mg/L
When rhabdomyolysis is suspected, the risk of acute kidney injury (AKI) increases when myoglobin is detectable in urine, especially in the presence of aciduria and hypovolemia. A cut-off for AKI is not well defined but levels above 20 mg/l correlate with a significantly increased risk for AKI. Serum myoglobin seems to be a better marker for predicting AKI in the setting of rhabdomyolysis.
The test may help to predict the risk of acute kidney injury but is only one factor.
CK may be a better predictor of risk of acute kidney injury.