Calculadora de Na corrigido

The corrected sodium calculator is a clinical tool used to adjust serum sodium levels in patients with hyperglycemia. When blood glucose is elevated, it draws water into the extracellular space, diluting sodium and causing a falsely low measurement. The correction is made using Katz's formula: Na_corr = measured Na + 2.4 × (glucose − 100) / 100. This calculation estimates the sodium level the patient would have if glucose were normal, allowing a more accurate assessment of fluid and electrolyte balance.

This tool is useful in emergency situations such as diabetic ketoacidosis, hyperosmolar hyperglycemic state, or in patients with decompensated diabetes. Doctors, nurses, and medical students can use it to interpret lab results and guide decisions about fluid and electrolyte replacement. Correction is particularly important because a normal or high corrected sodium may indicate dehydration, while a low value suggests true hyponatremia requiring specific treatment.

To use the calculator, enter the measured sodium (in mEq/L) and glucose (in mg/dL). The result is the corrected sodium, which should be interpreted alongside the clinical context. Caveats: the formula assumes glucose is above 100 mg/dL and is most accurate for values between 100 and 400 mg/dL. For very high glucose, the correction may be less precise. Also, the formula does not apply to other causes of hyponatremia, such as diuretic use or heart failure. Always consult a healthcare professional.