Creatinine Clearance

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Testing Laboratory

Auckland Te Toka Tumai | Auckland Hospital

Department

Chemical Pathology

Delphic Registration Code (Alpha Code)

CRCL

Test Code (Numeric Code)

0225

Laboratory Handling

Phlebotomy

24 h urine collection for creatinine, plus a blood for creatinine (5 mL blood, SST or PST tube) taken within 24h of the start or finish of the urine collection period. Accurate timing of the 24h collection is essential.

Sample Stability

-

Synonyms

kidney Function Test, Renal Clearance, Urine Creatinine Clearance, 24-hour Urine Creatinine.

Turnaround Time

3 hours

Specimen Type

  • 24hr Urine
  • Plasma
  • Serum

Specimen Requirements

Tube/Container Type:

Preferred
  • 24hr Urine Container
  • Lithium Heparin - Non-gel (Green Cap)
  • SST II (Gold Cap)

Paediatric Specimen Requirements

Tube/Container Type:

Preferred
  • 24hr Urine Container
  • Heparin (Microtainer)
Acceptable
  • 24hr Urine Container
  • SST II (Gold Cap)

Additional Specimen Information

SPECIMEN:

24 h urine collection for creatinine, plus a blood for creatinine (5 mL blood, SST or PST tube) taken within 24h of the start or finish of the urine collection period.

Accurate timing of the 24h collection is essential.

How to collect an accurate 24h urine
1. Decide on the START TIME of the collection. It is usually most convenient to start in the morning.

2. At the START TIME the patient empties her / his bladder into the toilet (NOT into the bottle). Note the START TIME and date on the bottle(s).
3. All urine passed after this is collected into the bottle(s). If possible refrigerate the collected urine to prevent bacterial growth.
4. At the END TIME (exactly 24h after the START TIME) the patient empties his / her bladder, into the bottle.

5. Deliver the bottle(s) promptly to the laboratory.

Last updated: 26/03/2026