| Laboratory: | Clinical Biochemistry |
| Test Name: |
URIC ACID - (U)
Test Code:
UAU
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| Clinical Information: |
Uric acid is the final product of purine metabolism. Urine uric acid excretion is used in the assessment and management of patients with kidney stones, particularly uric acid stones.
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| Collection Devices: |
Preferred Device:
Collect 24 h urine without preservative. Refrigerate until analysis. Uric acid cannot be performed on the same 24h collection as tests requiring pH adjustment to ≤2 (Calcium Oxalate, Phosphate, HVA, VMA, 5-HIAA).
Random urines acceptable ONLY for pediatric endocrinology, pediatric nephrology and pediatric urology. |
| Specimen Required: |
Urine: 24.0 hrs
Pediatric Urine: 24.0 hrs
An entire 24 hr urine collection is required. Please see patient collection brochure (PB110-50-01) for urine collection procedure. Stability 4 days at room temperature (when NaOH added to collection) |
| Referral: |
Urine: 3.0 mL
24h collection: Measure and record volume; save an aliquot of urine for urine creatinine and then pH the remaining entire 24h collection to > 8.0 with 1M NaOH. Send aliquots (3mL) to the referral lab. Refrigerate until analysis.
Random collection: save an aliquot of urine for urine creatinine and then add NaOH to the remaining random urine sample to pH>8. Send aliquots to the referral lab. Refrigerate until analysis. |
| Requisition: | |
| Reference Values: |
24 h: 1.5 - 4.5 mmol/d (mmol/d x 0.17 = mg/d)
Random: < 12 mo: < 1.5 mmol/mmol creatinine 1 - 3 y: < 1.3 3 - 5 y: < 1.0 5 - 10 y: < 0.6 > 10 y: < 0.4 |
| Availability: |
24hr Urine: Weekdays.....Random Urine: Weekdays for pediatric endocrinology, pediatric nephrology & pediatric urology.
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| See Also: | |
| More Information: |
See SOP 110-50-01, JA110-50-01A, JA110-50-01B.
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