The equation to correct sodium in hyperglycemia is [(Glucose-100) * 0.016 ] + Na. This is because serum Na concentration falls in proportion to the dilution of the ECF, declining 1.6 mEq/ L for every 100 mg/dL increment in the plasma glucose level above normal.
First, take the patient's glucose value, and subtract 100.
Multiply the value against 0.016.
Add the value to the patient's given sodium level. This will give the corrected sodium level.
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