Specimen Collection

SPECIMEN: 24 h urine or spot urine sample. No preservative required.

Sample stability:

• 2 days at 15-25 ^o C
• 6 days at 2-8 ^o C
• 3 months at -20 ^o C

Reference Intervals

Endogenous creatinine production is proportional to muscle mass.

Units: mmol/24h

AGE / SEX	creatinine output mmol/24h
0 - 6 months	0.2 - 1.6
6 month - 2 years	0.2 - 2.0
2 - 6 years	0.5 - 6.0
6 - 10 years	1.5 - 12.6
10 - 15 years	2.0 - 20.0
Adult Female	4.0 - 17.0
Adult Male	7.0 - 24.0

Conversion factors: mg/100 mL x 0.0884 = mmol/L
mmol/L x 11.3122 = mg/100 mL

Uncertainty of Measurement: 6%

Turnaround Time: Within 3 hours
Diagnostic Use and Interpretation

1. As part of a Creatinine Clearance test.

2. To assess the completeness of a timed urine collection. For this purpose, the following approximate creatinine excretion rates, related to body weight, may be used:

adult male:	0.20 mmol/kg body weight/24h
adult female:	0.15 mmol/kg body weight/24h
child:	0.10 mmol/kg body weight/24h

Contact Information

Emails to chemicalpathologist@adhb.govt.nz will receive priority attention from the on-call chemical pathologist.

If the query concerns a specific patient please include the NHI number in your email.

If email is not a suitable option, please contact the on-call chemical pathologist via Lablink (Auckland City Hospital ext. 22000 or 09-3078995).

Individual chemical pathologists may be contacted but will not be available at all times.

After-hours : contact Lablink (Auckland City Hospital ext. 22000 or 09-3078995) or hospital operator for on duty staff after hours.

Dr Samarina Musaad (Clinical Lead) : SamarinaM@adhb.govt.nz ext. 22402

Dr Cam Kyle: CampbellK@adhb.govt.nz ext 22052

Dr Weldon Chiu: WeldonC@adhb.govt.nz ext. 23427

Dr Campbell Heron: CHeron@adhb.govt.nz ext. 23427

Dr Sakunthala Jayasinghe: Sakunthala@adhb.govt.nz ext. 23427

Last updated at 15:26:00 06/01/2025