Creatinine, Fluid

Diagnostic Use

Creatinine is a waste product produced by skeletal muscle tissue. Creatinine is usually measured in the plasma as a biomarker of renal function.

Creatinine may occasionally be measured in body fluid to assess for the presence of urine in the fluid.

Department

Core Biochemistry

Delphic Registration Code

FLUD

Synonyms

Fluid Crn

Turnaround Time

8 hours

Test Code

3678

Specimen Type

• Fluid

Specimen Requirements

Tube/Container Type:

Preferred

• Pottle

Preferred Sample Volume (ml)

5.0

Additional Specimen Information

Viscous samples are unsuitable for analysis

Aliquot Instructions

Minimum Volume (ml)

0.1

Transport to Lab

Ambient (8 - 24 degrees Celsius)

Interpretation

The creatinine concentration in urine is usually an order of magnitude greater than elsewhere in the body (millimolar vs micromolar quantities).  Therefore creatinine concentration may be measured in an unspecified body fluid to see if the fluid contains urine, which may indicate that the source of the fluid is in communication with the urinary tract.

Please note that the creatinine assay has not been validated for measurement on body fluid specimens. Results must be interpreted with caution.

Reference Intervals

N/A

Test Method

Enzymatic spectrophotometry on a Beckman Coulter AU5822 analyser using Beckman Coulter reagents.

Non-Funded Test Cost

$4.38 (Exclusive of GST)

Billing Code

3678

Contact Information

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