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Test 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, U

Specimen Type

Urine

Specimen Minimum Volume

1 mL

Specimen 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 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

MCHS- Mankato

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

Report Available

Same day/1 to 2 days