Perc
Perc is a fast, free health calculator. Enter Age ≥ 50, HR ≥ 100 bpm and SpO₂ < 95% to get an instant, accurate result — complete with the formula, a step-by-step worked example, and answers to common questions, all on one page and private to your browser.
Formula
PERC: if ALL 8 criteria absent in low pre-test probability → PE excluded without D-dimer (Kline 2004)
- PERC: if ALL 8 criteria absent in low pre-test probability → PE excluded without D-dimer (Kline 2004) — for clinical reference only.
Perc
Perc calculation.
Frequently asked questions
Is this validated?
Yes, based on published clinical scoring systems. Always confirm with current guidelines.