Home
HelpTest Code LAB383 Creatinine Clearance - Blood and 24 Hour Urine
Department
CHEMISTRY
Collection Requirements
Blood specimen and 24 hour urine specimen.
Must submit patient’s height and weight, either on 24 hour collection form or on specimen label.
Urine collections less than 24 hours must have length of collection documented on 24 hour urine collection form.
Do not add preservatives to the collection container. Keep the container on ice or refrigerated during collection.
A blood specimen should be collected during the 24hr urine collection period but is acceptable if collected within 48 hrs of urine completion.
Primary Collection Container
Green PST (Lithium Heparin)
24 HR Urine container
Alternate Collection Container
Green Microtainer PST
Transport
Refrigerated
Preferred Transport Temperature
Refrigerated
Processing
Blood: Centrifuge and refrigerate gel tube.
Urine: Refrigerate until processed, measure total volume, aliquot, centrifuge and refrigerate.
Note total volume on the label.
Stability
Blood:
Refrigerated: 48 hours
Urine:
Ambient: 4 hours
Refrigerated: 4 days
Minimum Testing Volume
Plasma: 0.1 mL
Urine: 1.0 mL
Reference Range
0 min-10 yrs 50 -90 ml cleared/min
10 yrs-70 yrs 85 -125 ml cleared/min
70 yrs-150 yrs 30- 95 ml cleared/min
Methodology
Refer to individual methods
Performed
Sunday – Saturday
Reported
As completed
CPT Codes
82575
Unacceptable Conditions
Urine specimen must be 24 hour collection.
Blood specimen collected more than 48 hrs after urine collection is complete.