Potassium CPT: 84132

Expected Turnaround Time

Within 1 day

Specimen Requirements


Serum (preferred) or plasma.


1 mL

Minimum Volume

0.5 mL


Red-top tube, gel-barrier tube, or green-top (heparin) tube.


Separate serum or plasma from cells within 45 minutes of collection; avoid hemolysis.

Storage Instructions

Maintain specimen at room temperature or refrigerate.

Stability Requirements

Temperature Period
Room Temperature 14 days
Refrigerated 14 days
Frozen 14 days
Freeze/thaw/ cycles Stable x 3

Patient Information

To determine whether your potassium level is within normal limits; to help evaluate electrolyte balance; to help determine the cause of and monitor treatment for illnesses associated with abnormal potassium levels in the body.

When you have symptoms such as muscle weakness and/or irregular heart beat (cardiac arrhythmia) or when an electrolyte imbalance is suspected; at regular intervals when you are taking a medication and/or have a disease or condition, such as high blood pressure (hypertension) or kidney disease, that can affect your potassium level; as part of a routine medical exam.

A blood sample drawn from a vein in your arm; sometimes a random or 24-hour urine sample.