Beta-2-microglobulin urine

Patient should empty bladder then drink a large glass of water.

Collect urine 1 h later and deliver promptly to the laboratory.

Immunoassay.

< 0.2 mg/L.

< 30 mg/mol creatinine.

Ancillary test, of limited clinical utility, in the investigation of renal tubulo-interstitial disorders.

Elevated levels may help to define the degree of tubular dysfunction.