Creatinine-Urine, Random

Label Mnemonic:	URCRT
Epic code:	LAB600
Order form:	Laboratory Requisition
Supply order:	Supply Order Form
Billing:	Billing Policies
CPT code:	82570

Specimen(s):

Urine, Random

Collection Medium:

Clear 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. Intra individual variability in creatinine clearance can be due to diet (e.g., amount of ingested meat) and total skeletal muscle mass.

Sample Processing:

Submit in leak-proof container.

Sample Storage:

Refrigerate.

Transport Instructions:

Place labeled specimen into zip-lock type biohazard bag; seal bag.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.

See Additional Information:
Urine Tests Requiring no Preservatives