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Test Code LAB2018 Uric Acid and Creatinine Ratio, Urine

Clinical System Name

Urine Uric Acid, Creatinine and Ratio Panel 

Synonyms

U Uric/Cr

Sample Requirements

Specimen:  Urine

Container(s): Sterile screw-capped container, Clean container also acceptable.

Preferred Vol: 5 mL

Minimum Vol: 2 mL

Note: Timed collection is preferred. Deliver labeled container to clinical lab upon completion.

 

Processing Instructions

Reject due to: 

Spin: N

Aliquot: N

Temp: 2-8 C

Storage location: CPA refrigerator, FrigB bucket.

Off-site collection: Timed collection is preferred. Send original container refrigerated.

Stability

 

Specimen Type Temperature Time
Urine RT

≤ 24 H
  Refrigerated

≤ 5 D
  Frozen

≤ 180 D

 

Availability

STAT Performed TAT
N M - F, day shift 1 -3 d

 

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Chemistry

Location: Chem East

Phone Number: 206-987-2617

CPT Codes

84560, 82570

Methodology

Method:  Spectrophotometric, Rate methods by Vitros 4600

Analytical Volume:  0.05 mL supernatant

Reference Range

 

Urine Uric Acid/Creatinine Range AGE RATIO
  0-12 months <2.8
  1 year - 2 years <2.0
  3 years - 5 years <1.8
  6 years - 8 years <1.5
  9 years - 11 years <1.2
  = or > 12 years <0.8

 

 

Patients with Lesch-Nyhan typically have urine uric acid/creatinine ratio >2.0. Kaufman etal. J Pediatr. 73:583, 1968