Corrected Sodium for Glucose Calculator

How it is calculated

Both formulas add a fixed amount of sodium for every 100 mg/dL by which glucose exceeds 100 mg/dL: Nacorr = Nameas + k × (glucose − 100) / 100. Na is in mEq/L (numerically the same as mmol/L) and glucose in mg/dL. The Katz line uses k = 1.6, the Hillier line uses k = 2.4. If you choose mmol/L for glucose, the tool first multiplies by 18.0182 to get mg/dL. Results are rounded to one decimal. The 'correction' figure shown is the Katz adjustment only. Glucose below 100 mg/dL gives a small negative correction. Sodium outside 80–200 and glucose of zero or above 3000 mg/dL return no result.

Common mistakes

• Entering glucose in mmol/L while the unit is set to mg/dL. A reading of 33 mg/dL is treated as extremely low glucose and gives a negative correction, whereas 33 mmol/L is about 600 mg/dL.
• Treating the corrected value as a replacement for the lab result. It is an estimate of what sodium would be at normal glucose, not a measurement.
• Expecting Katz and Hillier to agree. At glucose near 100 mg/dL they match, but the gap grows with every extra 100 mg/dL.
• Reading the 'correction' line as the combined effect of both formulas. It is the Katz adjustment only; the Hillier adjustment is 1.5 times larger.
• Converting glucose to mg/dL by hand and then leaving the unit on mmol/L, so the value is multiplied by 18 twice.