Enter the measured potassium level and the measured sodium level into the calculator to determine the corrected potassium level. This calculator can also evaluate any of the variables given the others are known.

Corrected Potassium Formula

The following formula is used to calculate the corrected potassium level.

CP = K + 0.6 * (4.0 - Na)


  • CP is the corrected potassium level (mmol/L) K is the measured potassium level (mmol/L) Na is the measured sodium level (mmol/L)

To calculate the corrected potassium level, subtract the measured sodium level from 4.0. Multiply the result by 0.6. Add the measured potassium level to this result.

What is a Corrected Potassium?

Corrected Potassium is a calculated value used in medical practice to estimate the actual potassium level in a patient’s blood when the patient has a high blood glucose level. High blood glucose can cause a shift of potassium from inside the cells to the blood, resulting in a falsely elevated blood potassium level. The corrected potassium level gives a more accurate reflection of the body’s potassium status, helping to guide treatment decisions.

How to Calculate Corrected Potassium?

The following steps outline how to calculate the Corrected Potassium (CP) using the given formula:

  1. First, determine the measured potassium level (K) in mmol/L.
  2. Next, determine the measured sodium level (Na) in mmol/L.
  3. Next, substitute the values of K and Na into the formula: CP = K + 0.6 * (4.0 – Na).
  4. Finally, calculate the Corrected Potassium (CP) using the formula.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge:

Measured potassium level (K) = 3.5 mmol/L

Measured sodium level (Na) = 140 mmol/L