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HelpTest Code RKUR Potassium, 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.
Useful For
Determining the cause for hyper- or hypokalemia using a random urine specimen
Method Name
Potentiometric, Indirect Ion-Selective Electrode (ISE)
Reporting Name
Potassium, Random, USpecimen Type
UrineSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| 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 potassium may be interpreted in conjunction with serum potassium, using both values to calculate fractional excretion of potassium.
The calculation for fractional excretion (FE) of potassium (K) is
FE(K)= ([K(urine) X Creat(serum)]/[K(serum) X Creat(urine)]) X 100
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84133
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RKUR | Potassium, Random, U | 2828-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| RKUR | Potassium, Random, U | 2828-2 |
Day(s) Performed
Monday through Sunday