Test Details

Mnemonic

UCI24

Ordering Code

1005020

CPT-4 Code(s)

82507, 82570

Specimen Information

Collect

24 hour urine. The bladder must be emptied at the time the collection is to begin and this urine is discarded. Thereafter all urine must be collected until the end of the scheduled time and kept refrigerated during collection.
Collect urine with 10 grams of boric acid at the start of collection. Refrigerate urine during collection (critical). Mix the collection well before checking the pH and ensure boric acid tablet is well dissolved. pH should be between 4-7.
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Specimen Preparation

Send 25.0 mL urine refrigerated in a screw-capped plastic urine container. Record total volume on requisition and specimen label.
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Alternate Specimen

Refrigerate urine during collection (critical) and add 10 grams of boric acid to the entire collection within 4 hours of completing. Mix the collection well before checking the pH and ensure that boric acid tablet is well dissolved. pH should be between 4 - 7. Record total volume on both the requisition and specimen label. Send 25.0 mL aliquot refrigerated in a screw-capped plastic urine container.
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Minimum Volume

10.0 mL
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Transport Temperature

Refrigerated
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Rejection Criteria

Samples with incorrect pH
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Stability

Room temperature: Unacceptable
Refrigerated: 14 days
Frozen: 60 days
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Methodology

Spectrophotometry
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Reference Range

Citrate 24 hr Urine: 280 - 1240 mg/24 hr
Creatinine 24 hr Urine: Males: 1 - 2 g/24 hr
Females: 0.8 - 1.8 g/24 hr
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Performing Laboratory

Warde Medical Laboratory
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