QTc Correction
QTc Correction - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
Open the QTc Correction → Runs in your browser. No signup, no tracking.
What this is
Compute corrected QT interval using four published formulas - Bazett, Fridericia, Framingham, and Hodges - side by side. Bazett is the historical default; Fridericia is preferred at heart rates outside 60-100 bpm; Framingham and Hodges are linear alternatives that avoid Bazett's overcorrection at high rates. Enter a QT in milliseconds and a heart rate, and Sophie Well returns all four QTc values rounded to the nearest millisecond.
When to use it
Use this when reading an ECG and the machine-printed QTc looks suspect, when reviewing a patient on QT-prolonging medications, or when you want to compare formulas before documenting a single value. The result is reference math only; sustained QTc above 500 ms or any clinically driven QTc concern warrants direct ECG review and pharmacy or cardiology consult.
References
Bazett 1920; Fridericia 1920; Sagie (Framingham) 1992; Hodges 1983. All four formulas reported side by side.
Worked example: All four formulas ~400 ms
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.