Home
HelpTest ID RPHOC Phosphorus, Random, Urine
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic, 5-mL tube
Specimen Volume: 4 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Secondary ID
610829Useful For
Evaluation of hypo- or hyperphosphatemic states
Evaluation of patients with nephrolithiasis
Specimen Type
UrineSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 14 days |
| Frozen | 30 days | |
| Ambient | 7 days |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Reference Values
No established reference values
Random urine phosphorus may be interpreted in conjunction with serum phosphorus, using both values to calculate fractional excretion of chloride.
The calculation for fractional excretion (FE) of phosphorus is
FE(P)= ([P(urine) X Creat(serum)]/[P(serum) X Creat(urine)])X100
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84105
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 3 daysForms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.