| Methodology: |
Porter-Silber
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| Performed: |
Tue, Fri
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| Reported: |
3-7 days
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| Specimen Required: |
Collect: 24-hour urine. Random specimens are acceptable, but are reported as mg/L and have no reference interval. Specimen must be refrigerated during collection.
Transport: 12 mL urine aliquot from a well-mixed 24-hour collection, frozen. Submit specimen in three ARUP Standard Transport Tubes.
Pediatric Collection/Transport: 5 mL urine aliquot from a well-mixed 24-hour collection, frozen.
Remarks: Specimens refrigerated with preservatives are acceptable. Sample pH must be 5.0 - 7.0. Mix well, add 1 g boric acid/100 mL urine, adjust pH (with boric acid) to 5.0-7.0 and freeze. Record total volume, collection time, and pH on transport tube and test request form.
Unacceptable Conditions: Alkali preservatives (e.g. samples previously preserved with NaOH).
Stability: Ambient: 4 hours with preservative; Refrigerated: 1 week with preservative; Frozen: 1 month
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