CREATININE CLEARANCE

Mnemonic

CREATCU

Synonym

UCRC - Urine Creatinine Clearance

Includes

Serum Creatinine, Urine Creatinine

Specimen Collection Requirements

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube, AND Urine, 20.0 mL aliquot of a 12 or 24 hour urine collection.

Handling

Allow serum to clot completely at room temperature (minimum: 30 minutes). Preferably, separate serum or plasma from cells before transport. Urine: 12 or 24 hour collection container refrigerated (2-8°C). Submit patient’s height, weight and total volume of a 12 or 24 hour collection in the requisition.

Preferred Volume

1.0 mL serum or plasma AND 20.0 mL aliquot of urine

Minimum Volume

0.5 mL serum or plasma AND 2.0 mL aliquot of urine

Transport

Refrigerated (2-8°C)

Rejection Criteria

Serum or Plasma: grossly hemolyzed specimens

Stability

SERUM OR PLASMA: Lithium heparin tubes (PST) are stable up to 7 days refrigerated on the primary spun gel tube AFTER SEPARATION FROM CELLS: Ambient (20-25°C): 24 hours; Refrigerated (2-8°C): 7 days; Frozen (at or below -20°C): 1 month. URINE: Ambient (20-25°C): 2 days; Refrigerated (2-8°C): 6 days; Frozen (at or below -20°C): 1 month

Testing Information

Performed

7 days/week

Method

Colorimetry

Referral Lab

Samaritan Health Services Laboratories

Reference Values

Reference Values

Age, weight and sex adjusted ranges. Corrected for body surface area.
MALE: 80-110mL/min/1.732
FEMALE: 80-110 mL/min/1.732

CPT Codes

82575

Last Updated: Thursday, January 5, 2017 03:42:05 AM