A rough size of the total body potassium deficit from the serum level, when the low potassium comes from loss. It is an order of magnitude to plan and re-check against, not a replacement dose.
What you enter
Serum potassium (mmol/L or mEq/L)
FORMULADeficit (mmol) = (4.0 - serum K) x 200 to 400; point estimate = (4.0 - serum K) / 0.3 x 100
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