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Phosphorus, 24 hour (or timed) urine

Item Value
Approval req'd? Yes, if testing is requested between midnight and 8:00 AM.
Available Stat? No
Test code PO4U
Test group Phosphorus
Performed by Parnassus Chemistry
In House Availability Test available 7 days per week from 8:00 AM to midnight only.
Method Spectrophotometric (molybdate)
Collection Instructions Refrigerate container during collection period.

Note that the minimum acceptable time period for a 'timed' collection is 6 hours.

Results of collections of less than 24 hour duration will be adjusted to reflect a '24 hour collection'. The limited time of collection as well as the need to adjust the values to be comparable to the '24 hour' normal ranges will inherently affect the accuracy of the results.
Container type 24 hour urine collection container

Click here for Urine Preservative Requirements
Amount to Collect Entire urine output for collection period
Sample type Timed urine collection
Preferred volume 1 mL urine
Min. Volume 0.5 mL urine
UCSF Rejection Criteria Container not refrigerated during collection.
Processing notes Aliquot 1 mL and add 1 drop of 6N HCl to acidify.
Units mg/D
Normal range 400-1300 mg/D
Synonyms PO4
Stability Refrigerated 2 days
Turn around times 4-18 hours
Additional information To convert mg/dL to mmol/L (SI units) multiply by 0.323.

Output varies wit diet

Results of collections of less than 24 hour duration will be adjusted to reflect a '24 hour collection'. The limited time of collection as well as the need to adjust the values to be comparable to the '24 hour' normal ranges will inherently affect the accuracy of the results.
Last Updated 1/14/2015 10:08:54 AM
Entry Number 741
Lab Procedure Link Click here for Procedure
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