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Test Code CRCL Creatinine Clearance

Specimen Type

24-hour urine and blood

Collection Volume

Entire urine collection, 5 mL blood

Minimum Collection Volume

Entire urine collection, 0.6 mL blood (Green microtainer )

Collection Instructions

Instruct the patient to void at 8:00 AM and discard the specimen. Then collect all urine, including the final specimen, voided at the end of the 24-hour collection period, i.e., 8:00 AM the next morning. Keep specimen on ice during collection. Screw the lid on securely. Specimens should be transported promptly to the Clinical Laboratory. Contatiner must be labelled with patient’s full name, room number, date and time for a 24-hour collection. A blood sample for creatinine is also required within 72 hours of urine collection.

Rejection Criteria

Incomplete 24 hour urine collection; No height and/or weight indicated; No blood sample within 72 hours of urine collection.

Specimen Storage and Stability

Refrigerate specimen

Turn Around Time

24 hours routine

Lab Department

Chemistry

Alias

Creatinine, Serum, Creatinine, Urine; Creatinine Clearance; 24 Hour Creatinine Clearance;

Ordering Info

NOTE: Serum and Urine are required. Serum must be drawn within 72 hours of urine collection.

EPIC Code

LAB384

Acceptable Collection Container

SST, GRN-PST,R-NoGel , G-NoGel plus a 24 hour urine container

Patient Preparation

Avoid cephalosporins. Have patient drink water before the clearance has begun, and continue good hydration throughout the clearance. If possible, drugs should be stopped beforehand.

Day(s) and Time(s) Performed

Monday through Sunday, 24 hours