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Test Code U24 Creat Urine 24 Hour, Creatinine

Patient Preparation

No special patient preparation required

Special Collection Instructions

Specimen must be received with the following information included:

  • Total volume of collection
  • Start date and time
  • Stop date and time

Collection Method

24 hour urine collection

Minimum Volume

  • Adults: 0.4 ml
  • Pediatric: 0.25 ml

Container

24 hour urine container

Preferred Specimen

24 hour urine container

Acceptable Specimens

24 hour urine container

Reference or Target Ranges

Female 720 – 1510 mg/24 hour
Male 980 – 2200 mg/24 hour

Reportable Units

mg/24 hour period

Critical Value

Not defined for this assay

Reasons for Rejection

 


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Hemolysis Threshold 500 mg/dL
Icterus Threshold 10 mg/dL
Lipemia Threshold 500 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type, collection information not provided

Specimen Stability

 


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Ambient 2 days
Refrigerated (4°C to 8°C) 6 days
Frozen(-40°C to 0°C) 6 months

Performance Information

 


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Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availabilty Yes
Performing Bench UH Chemistry
Methodology/Method Description Siemens Atellica – Colorimetric Assay

Additional Information/Important Notes

The laboratory computer system cannot extrapolate a 24 hour urine result with data from a timed urine specimen that is not 24 hours. If a timed urine specimen is submitted that is not 24 hours and the physician insists that it be tested, cancel the 24 hour urine order and reorder the test as for a random urine. Enter the urine creatinine result in mg/dL and add the comment: "This urine specimen was collected over a period of _ hours with a total volume of _ mL. Since the collection period is not 24 hours, automatic extrapolation to 24 hour reports is not avaliable. Clinical correlation and/or manual calculation of extrapolated 24 hour excretion level is required. (Enter the collection period in the first blank and the total volume in the second blank.)

CPT Codes

81050;82570