Within 24 hours
New York DOH Approval Status
24-hour urine. Refrigerate during collection. Also acceptable: Random urine.
Adjust pH to 1 by adding 6M HCl (approximately 10 mL HCl/24-hour specimen based on normal adult output of 1000-2000 mL/24 hours. Pediatric specimens will require less than 10 mL to reach the correct pH). Record total volume and collection time interval on transport tube and test request form.
Transfer 4 mL aliquot of urine from a well-mixed 24-hour collection to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Specimens containing preservatives other than HCl. Specimen submitted in metal containers.
Ambient: 3 days (if acidified); Refrigerated: 2 weeks; Frozen: 1 year
Effective August 15, 2011
Per 24h calculations are provided to aid interpretation for collections with a duration of 24 hours and an average daily urine volume. For specimens with notable deviations in collection time or volume, ratios of analytes to a corresponding urine creatinine concentration may assist in result interpretation.
|Component Test Code*||Component Chart Name||LOINC|
|0020207||Creatinine, Urine - per volume||2161-8|
|0020208||Creatinine, Urine - per 24h||2162-6|
|0020211||Magnesium, Urine - per volume||19124-7|
|0020212||Magnesium, Urine per 24h||24447-5|
- Magnesium/Creatinine, Random, Urine