Why do you correct sodium for glucose?

Hyperglycemia causes osmotic water shifts from cells into the extracellular space, diluting serum sodium. The corrected sodium formula adjusts for this effect: for every 100 mg/dL glucose above 100, sodium is corrected upward by 1.6–2.4 mEq/L. This reveals the true sodium status to guide treatment.

What is the transtubular potassium gradient?

The TTKG estimates renal potassium excretion and helps determine whether hypokalemia or hyperkalemia is caused by renal or extrarenal mechanisms. A TTKG >7 in hyperkalemia suggests appropriate renal response, while TTKG <7 suggests impaired renal potassium excretion.

When are these calculators most useful?

These calculators are most useful in acute care settings when managing electrolyte derangements, diabetic emergencies (DKA, HHS), and complex fluid/electrolyte disorders. They provide quick calculations that would otherwise require manual math at the bedside.

Hematology Calculators

Q: When are these calculators most useful?

These calculators are most useful in acute care settings when managing electrolyte derangements, diabetic emergencies (DKA, HHS), and complex fluid/electrolyte disorders. They provide quick calculations that would otherwise require manual math at the bedside.

Hematology tools for corrected sodium in hyperglycemia, transtubular potassium gradient, and related electrolyte calculations relevant to blood disorders and transfusion medicine.

This category currently includes 2 tools, including 4T Score (HIT) and Revised Geneva.

These resources are built for clinicians, trainees, and medically informed patients who need fast bedside calculations. Use the results as decision support and pair them with full clinical context and local guidelines.

All Hematology Tools (2)

4T Score (HIT)

Calculate the 4T score for heparin-induced thrombocytopenia (HIT) pretest probability. Score ≤3: >99% NPV for HIT. Intermediate/High (≥4): stop heparin, start alternative anticoagulation.

Revised Geneva

Calculate the Revised Geneva Score to estimate clinical probability of pulmonary embolism.

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