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Potassium - Blood

Source Blood
Mnemonic K
Specimen Requirements

1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections

Specimen Handling MUST be centrifuged within 2 hours of collection to ensure accurate results.
Additional Information
Testing Location Chemistry-All Sites
Rural: CRL
Testing Frequency Daily
Alternate Name(s) K
Reference Interval

Less than 29 days

3.5 - 6.0 mmol/L

29 - 364 days

3.5 - 5.5 mmol/L

1 – 150 years

3.5 - 5.0 mmol/L

Click here for critical values.

Note: Potassium concentration is 0.2 to 0.5 mmol/L higher in serum (gold top).