Creatinine Clearance

Specimen Required

Urine in a 24 hour urine container and collect blood in One Lithium Heparin separator or one SST/gel tube (a serum creatinine must be performed to calculate the clearance).

Specimen Minimum Volume

submit entire 24 hour collection

Specimen Stability Information

Keep specimen refrigerated during collection and transport as soon as possible to the Laboratory.

Special Instructions

– Please write the patient’s height and weight on the request form. n- A creatinine clearance can be performed on any timed collection; however, a 24 hour collection is recommended. n- Collecting a 24 hour urine sample: n 1. To start the collection, empty bladder and discard this specimen. This will be the start of the collection period. Write the date and time on the collection container. n 2. DO NOT VOID directly into the container. Void into a clean container and then pour the specimen into the 24 container. Keep the container refrigerated during the collection period. n 3. At precisely the same time that the collection was started 24 hours earlier, empty bladder one final time and add this specimen to the 24 hour collection container. n 4. Deliver container to the Laboratory.

Performing Laboratory

As Ordered. Turn around time is 4 hours.

Reference Values

71-151 mL/min for a 24 hour collection