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Mayo Clinic Laboratories

Test Code OS,OSU OSMOLALITY SERUM/URINE

Performing Laboratory

Helen Keller Laboratory

Specimen Container:

Red top tube or Serum Separator Tube for serum specimens

Urine cup for urine specimens

Specimen Requirements

Required: Serum or Urine

1 mL (pediatric:  0.2 mL) of serum or urine

Reference Intervals:

Serum: 280 – 295 Mosm/kg

Urine: 500-800 mOsm/kg

Day(s) Testing is Performed

Monday-Sunday

CPT Code

Urine: 83935

Serum: 83930