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 7 tools, including 4T Score (HIT), Revised Geneva, and Padua Score.

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 (7)

4T Score (HIT)

Score HIT pretest probability with the validated 4T tool. Score ≤3: >99% NPV — HIT unlikely. Score ≥4: stop heparin and switch anticoagulants. Free clinical calculator.

Revised Geneva

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

Padua Score

Estimate venous thromboembolism risk in hospitalized medical patients using the Padua Prediction Score.

DIC Score

Estimate overt disseminated intravascular coagulation probability using the ISTH scoring framework.

NLR Ratio

Calculate NLR from absolute neutrophil and lymphocyte counts as an inflammatory and prognostic marker.

Mentzer Index

Calculate the Mentzer Index (MCV/RBC) to help screen iron deficiency anemia versus thalassemia trait in microcytosis.

PLR Ratio

Calculate PLR from platelet and absolute lymphocyte counts as an adjunct inflammatory marker.

Frequently Asked Questions

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