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Use our Sodium Glucose Calculator online to find corrected sodium from blood glucose and serum sodium with the accurate Katz formula.
| Term | Meaning |
|---|---|
| Corrected Sodium = Measured Na + 1.6 × ((Glucose − 100) ÷ 100) | Katz correction factor (1.6) for hyperglycemia-induced pseudohyponatremia |
| 100 mg/dL | Reference glucose level used as the correction baseline |
The Sodium Glucose Calculator finds a corrected sodium level. It helps when blood sugar is high. We made this tool so you can do the math with ease.
High blood sugar can pull water from cells into blood. This can make the sodium test seem low. The Katz method adds 1.6 mmol/L for each 100 mg/dL rise in glucose over 100 mg/dL.
Use this formula:
Corrected Sodium = Measured Sodium + 1.6 × ((Glucose − 100) ÷ 100)
Use mmol/L for sodium. Use mg/dL for glucose.
The Katz method uses 1.6. Some other methods use 2.4. So, the result may vary by the method used.
Our tool uses the Katz 1.6 method.
That’s it. The tool does the math for you.
Say your sodium is 130 mmol/L. Your glucose is 600 mg/dL.
First:
600 − 100 = 500
Next:
500 ÷ 100 = 5
Then:
5 × 1.6 = 8
Last:
130 + 8 = 138 mmol/L
So, the corrected sodium is 138 mmol/L.
It is like adding back the part that may look low due to the high sugar effect.
High blood sugar can lower the sodium level by moving water into the blood. A corrected value can help show the sodium level after this effect.
This is a math aid. It is not a full health check. A health care pro should read the full lab data.
Use the tool as a quick guide. Check each value before you run the math. A small input error can change the end result. If the lab sheet shows a unit you do not know, ask a health care pro. Do not guess the unit.
The tool can save time. It can also show each step in a clear way. This helps you see how the end value came from the input. You can check the math at a glance.
The key idea is quite plain. High sugar can shift water. The shift can make the blood test show less sodium than you may expect. The formula adds a set amount to the test value. The size of that add-on is tied to the sugar level.
For each 100 mg/dL above 100, the Katz method adds 1.6 mmol/L. So, if sugar is 200, the add-on is 1.6. If sugar is 300, the add-on is 3.2. If sugar is 400, the add-on is 4.8.
This does not mean the body has made new sodium. It is a math step that helps show what the sodium level may look like after the sugar effect is taken into account.
The same rule can be used by hand. You just need the sodium and glucose values. The online tool saves the time and shows the end value with less work.
Keep in mind that this is a set rule, not a full care plan. Lab data can change for many reasons. Your care team can tell you what the number means for you.
Use clear data. Read the lab line with care. Enter the same units that the tool asks for. This can help cut down on a bad input and a wrong end value. A quick check is worth the few extra secs.
The Sodium Glucose Calculator makes this math quick. Enter sodium and glucose. Then let the tool do the work. The Katz method adds 1.6 mmol/L for each 100 mg/dL rise in glucose over 100 mg/dL.
It finds corrected serum sodium when blood sugar is high.
Corrected Sodium = Measured Sodium + 1.6 × ((Glucose − 100) ÷ 100).
The main formula uses mg/dL.
Yes. Change it to mg/dL first. Multiply mmol/L by 18.
Yes. High glucose can make the added value raise the result.
No. It gives a math result. A health care pro should check the full case.