Creatinine, Timed Urine


Sunquest Code:UCRT  
Epic Code:LAB3823Epic Name:Creatinine Timed Urine
Methodology:Bichromatic end point calibrated to IDMS
Turnaround Time:Performed and reported 24 hours/day.
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Urine Collection Procedure



Collection Instructions

Specimen:Urine, timed collection (20 to 28 hours).
Optimal Volume:Submit entire collection; analysis requires 0.2 mL
Container:3 L plastic jug
Collection Instructions:Place specimen on ice or in refrigerator during collection.
Orthostatic Proteinuria Collection Only: Collect two 12 hour collections; one DAY and one NIGHT to diagnose orthostatic proteinuria. Order as two separate collections for their respective times.


Processing and Shipping

Specimen Processing:If two or more containers are received, verify that they are for the same collection time before combining. Mix collection well before aliquot is taken. Centrifuge specimens containing cells or precipitate. Aliquot 5 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:
Stability is 4 days at refrigerated temperature.  
Test Performed at or Referral Lab Chemistry  (Fairview Range - FRMC, UMMC-East Bank, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank)


Interpretive

Reference Range:

0-2 y

8-21 mg/kg/d

3-8 y

0.11-0.68 g/24 hr (110-680 mg/24 h)

9-12 y

0.17-1.41 g/24 hr (170-1410 mg/24 h)

13-17 y

0.29-1.87 g/24 hr (290-1870 mg/24 h)

18 y or older, Female

0.8-1.8 g/24 hr (800-1800 mg/24 h)

18 y or older, Male

1-2 g/24 hr (1000-2000 mg/24 h)

Reference range varies with amount of muscle mass present.

 

Use:Provide an estimate of time for monitoring excretion of other analytes.


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