Citric Acid, Urine CITU
|Collect||24-hour urine. Random samples are also acceptable. Refrigerate during collection.|
|Transport||4 mL aliquot from a 24-hour or random collection at 2-8°C. (Min: 0.5 mL)|
Adjust pH to less than or equal to 2 by adding 6M HCl. Samples previously preserved with boric acid are acceptable. Record total volume, collection time interval, and pH on transport tube and test request form.
|Stability||Ambient: 8 hours; Refrigerated: 1 week; Frozen: Indefinitely|
|Preferred Specimen Collection Device(s)|