Clinics and Departments

Laboratory Services

Lab Dept:

Urine/Stool

Test Name:

CREATININE, TIMED URINE

General Information

Lab Order Codes:

CR24

Synonyms:

Creatinine Quantitative Urine; Creatinine, 24 hour urine

CPT Codes:

82570 – Creatinine, other source
81050 – Volume measurement for timed collection, each

Test Includes:

Urine creatinine concentrations in mg/dL and mg/specimen

Logistics

Test Indications:

Creatinine is a high energy compound used in the metabolic processes of muscle contraction. A portion of the free creatine in muscle spontaneously and irreversibly converts to creatinine. Creatinine is present in all body fluids and secretions. It is freely filtered by the kidney glomeruli and is measured to assess kidney function.

Lab Testing Sections:

Chemistry

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 day

Special Instructions:

Submit an entire 24-hour urine collection. No preservative. Refrigerate specimen during and after collection.

Note: Starting and ending times of collection are required for a timed urine collection and must be documented electronically or on the proper request form.

Specimen

Specimen Type:

Urine, timed collection

Container:

Plastic leakproof container (No preservative). Urine GUARD® collection container is preferred for a timed urine sample.

Draw Volume:

Submit an entire 24-hour urine collection

Processed Volume:

Minimum: 0.5 mL urine

Collection:

For timed urine collections, empty the bladder, discard the voided sample, and note the start time. Collect all urine voided for the specified time period. At the end of the period, note the finishing time, add the last voided sample to the container by emptying the bladder. Bring the refrigerated container to the lab. Make sure all specimens submitted to the laboratory are properly labeled with the patient’s name, medical record number and date of birth.

Special Processing:

N/A

Patient Preparation:

None

Sample Rejection:

Mislabled or unlabeled specimens

Interpretive

Reference Range:

Age

Concentration mg/collection

3 – 8 years

110 – 680 mg/collection

9 – 12 years

170 – 1410 mg/collection

13 – 17 years

290 – 1870 mg/collection

>17 years

630 – 2500 mg/collection

Note: The reference values are for a 24 hour collection. Specimens collected for other than a 24-hour time period have no reference values established.

Critical Values:

N/A

Limitations:

N/A

Methodology:

Enzymatic, correlated to IDMS traceable

References:

EZCR Flex® reagent cartridge insert sheet PN 717270.003, issue date 2011-03-07 Rev C

Clinical Significance, Dade Behring Inc., Glasgow Business Community, Mailbox 531, P.O. Box 6101, Newark, Delaware 19714

Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition

Pediatric Reference Intervals, Sixth Edition, AACC Press, Washington DC, 2007

Biorad LiquichekÔ Unassayed Chemistry Control (Human) product insert, Irvine, CA

Biorad Liquichekä Urine Chemistry Control Product insert, Bio-Rad Laboratories, Irvine, CA 92618

Updates:

2/4/2013: Method update, previously listed as Alkaline Picrate/Kinetic



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