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Lab Dept:
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Urine/Stool
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Test Name:
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CREATININE, TIMED URINE
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General Information
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Lab Order Codes:
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CR24
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Synonyms:
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Creatinine Quantitative Urine; Creatinine, 24 hour urine
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CPT Codes:
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82570 – Creatinine, other source
81050 – Volume measurement for timed collection, each
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Test Includes:
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Urine creatinine concentrations in mg/dL and mg/specimen
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Logistics
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Test Indications:
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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.
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Lab Testing Sections:
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Chemistry
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Phone Numbers:
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MIN Lab: 612-813-6280
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STP Lab: 651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 day
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Special Instructions:
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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.
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Specimen
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Specimen Type:
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Urine, timed collection
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Container:
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Plastic leakproof container (No preservative). Urine GUARD® collection container is preferred for a timed urine sample.
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Draw Volume:
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Submit an entire 24-hour urine collection
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Processed Volume:
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Minimum: 0.5 mL urine
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Collection:
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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.
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Special Processing:
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N/A
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Patient Preparation:
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None
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Sample Rejection:
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Mislabled or unlabeled specimens
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Interpretive
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Reference Range:
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Age
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Concentration mg/collection
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3 – 8 years
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110 – 680 mg/collection
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9 – 12 years
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170 – 1410 mg/collection
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13 – 17 years
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290 – 1870 mg/collection
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>17 years
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630 – 2500 mg/collection
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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.
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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Enzymatic, correlated to IDMS traceable
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References:
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EZCR Flex® reagent cartridge insert sheet PN 717270.003, issue date 2011-03-07 Rev C
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Clinical Significance, Dade Behring Inc., Glasgow Business Community, Mailbox 531, P.O. Box 6101, Newark, Delaware 19714
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Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition
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Pediatric Reference Intervals, Sixth Edition, AACC Press, Washington DC, 2007
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Biorad LiquichekÔ Unassayed Chemistry Control (Human) product insert, Irvine, CA
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Biorad Liquichekä Urine Chemistry Control Product insert, Bio-Rad Laboratories, Irvine, CA 92618
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Updates:
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2/4/2013: Method update, previously listed as Alkaline Picrate/Kinetic
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