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Order Code CRETR Creatinine, Random, Urine


Specimen Required


Only orderable as part of a profile. For more information see orderable test ID.

 

Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Container/Tube: Plastic, 5-mL tube

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.


Useful For

Normalization of urinary analytes to account for the variation in urinary concentrations between individuals when using random urine collections

Method Name

Only orderable as part of a profile. For more information see orderable test ID.

Enzymatic Colorimetric Assay

Reporting Name

Creatinine, Random, U

Specimen Type

Urine

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 30 days
  Frozen  30 days
  Ambient  14 days

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability

Reference Values

Only orderable as part of a profile. For more information see orderable test ID.

 

≥18 years old: 16-326 mg/dL

Reference values have not been established for patients who are younger than 18 years of age.

Method Description

The enzymatic method is based on the determination of sarcosine from creatinine with the aid of creatininase, creatinase, and sarcosine oxidase. The liberated hydrogen peroxide is measured via a modified Trinder reaction using a colorimetric indicator. Optimization of the buffer system and the colorimetric indicator enables the creatinine concentration to be quantified both precisely and specifically.(Package insert: Creatinine plus ver 2. Roche Diagnostics; V15.0, 03/2019)

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

82570

Day(s) Performed

Monday through Sunday