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Test Code LAB712 Creatinine, Urine, 24 Hour

Performing Laboratory

St. Louis Children's Hospital Laboratory - Chemistry

Specimen Requirements

Patient Preparation: None

Collection Container/Tube:

Preferred: Plain, brown 24-hour urine collection container without preservatives

Specimen Collection Volume: Entire urine specimen collected over 24 hour period.

Submission Container/Tube: If specimen is coming from outside facility, mix well and measure total volume before making aliquot with a minimum of 1.0 mL of urine into a plastic screw-capped tube for transport labeling with volume and duration times or send entire 24-hr urine jug.

Special Instructions: 

  1. Refrigerate specimen during collection
  2. Note collection start and stop dates and times on collection container
  3. Call lab at 314-454-4268 to obtain 24-hour collection jug if needed
  4. Follow instructions on "Urine Collection"

 

Sample Rejection

Mislabled or unlabeled specimens

Logistics

Test Availability: Monday-Sunday

Cut-off time: None, performed as received

Turnaround Time: Same Day; 2 hours from receipt in performing lab

Reference Values

Reference Interval: 

<18 years: No reference values established                                   
≥ 18 years:  
   Female: 0.6-1.5 g/24H
   Male: 0.8-2.2 g/24H

Critical Value: None established

 

Methodology

Enzymatic Colorimetric

Limitations

  • NA

Additional Information

FOR SLCH CORE LABORATORY USE ONLY

Lab Processing Instructions: Mix well and measure total volume collected. Centrifuge an aliquot of the urine to clear any precipatates aliquoting cleared urine into a Roche false-bottom tube for testing.

Processed Volume: minimum 0.3 mL urine

Specimen Stability Information

Specimen Type Temperature    Time
urine (without preservative)     Ambient 2 days  
  Refrigerated     3 days   
  Frozen  6 months         

 

NOTE: 

  • Total volume of specimen collected and collection duration period is required. Note this information on the aliquot container label and into LIS system.
  • if collection duration is <18 hours or >30 hours cancel the 24Hr orderable and reorder test using the Timed orderable

 

Test Classification and CPT Code

82570

LOINC

Creat 24Ur:   2162-6

Volume Ur:    19153-6

Duration:       13362-9

Last Reviewed

07/2025