86170:CITRIC ACID, 24-HOUR URINE
Author PeaceHealth Laboratories
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| Alias Names: |
Citrate Urine |
| Methodology: |
Enzymatic |
| Edit Date: |
9/22/2008 |
| Performed: |
Daily |
| Released: |
24 hours after setup at PeaceHealth Laboratories’ reference lab. |
| CPT Code: |
82507-90 |
| Specimen Collection Details |
| Collection: |
24-hour urine in acid-washed container with 10 mL 6 M hydrochloric acid (HCl) added at start of collection. Specimen must be refrigerated during collection. Also acceptable; Random specimen acidified with 6M HCl. Preservative can be added at end of collection only if specimen has been refrigerated entire time. |
| Handling: |
Adjust pH to less than or equal to 2.0 with 6M HCl. Aliquot into a clean, dry plastic container. Refrigerate or freeze. |
| Stability: |
Specimen stable 8 hours ambient, 7 days refrigerated, or indefinitely if frozen. |
| Standard Volume: |
4 mL aliquot from a 24-hour urine collection or total random collection. |
| Minimum Volume: |
0.5 mL aliquot from a 24-hour urine collection. |
| Transport: |
Refrigerated; or if frozen, on dry ice. |
| Rejection Criteria: |
Specimen containing drug that causes alkalemia or acidemia. |
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Citric Acid |
≥ 18 years |
320-1240 mg/d |
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Citric Acid/Creatinine Ratio |
≥ 1 year |
≥ 150 mg/g |
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