Creatinine
Order Code: URCRT
Order Form: Laboratory Requisition
Specimen:
Urine, Random
Collection Medium:
Red top tube
Alternate Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
3.0 mL urine, random sample; no preservatives.
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
Units are mg/dL.
No established reference range for random urine creatinine measurement. See "Comments" for discussion of urine protein/creatinine ratio.
Comments:
The urine protein/creatinine ratio is automatically calculated if a urine protein and urine creatinine are ordered on the same specimen. The urine protein/creatinine ratio allows for an estimation of proteinuria based on a single random urine collection. A 24 hour urine protein determination remains the recommended true measure of proteinuria. The reference range for the urine protein/creatinine ratio is < 0.2 for 2 years or older. Reference range for the ratio is not established for children less than 2 years old. References: Morgenstern BZ, Butini L, Wollan P, et al. Am J Kid Dis 2003 Apr;41(4):760-766 National Kidney Foundation: Am J Kid Dis 2002;39:S93-S102 (suppl1) Wilson DM, Anderson RL. Am J Clin Pathol 1993;100:419-424
Test Limitations:
Contamination of urine with menstrual blood, prostatic secretions, or semen may result in increased urine protein levels. Vigorous exercise in healthy individuals may result in increased urine protein levels. Intraindividual variability in creatinine clearance can be due to diet (e.g., amount of ingested meat) and total skeletal muscle mass.
Sample Processing:
Submit urine in leak-proof plastic container.
Sample Storage:
Refrigerate.
Transport Instructions:
Place specimen into zip-lock type bag, seal bag.
Place requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.
CPT Code:
82570
 
See Additional Information:
Urine Tests Requiring no Preservatives