Perc
Result
Perc — free online calculator.
Formula
- Perc calculates its result from Age ≥50 (0/1), HR ≥100 (0/1), O2 sat <95% (0/1), Unilateral leg swelling (0/1), Hemoptysis (0/1), Recent surgery/trauma (0/1), Prior PE/DVT (0/1), Estrogen use (0/1). It uses the formula PERC: if ALL 8 criteria absent in low pre-test probability → PE excluded without D-dimer (Kline 2004). Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Age ≥50, HR ≥100, O2 sat <95%, Unilateral leg swelling, Hemoptysis, Recent surgery/trauma, Prior PE/DVT, Estrogen use. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Perc
- Age ≥50: 0 0/1
- HR ≥100: 0 0/1
- O2 sat <95%: 0 0/1
- Unilateral leg swelling: 0 0/1
- Hemoptysis: 0 0/1
- Recent surgery/trauma: 0 0/1
- Prior PE/DVT: 0 0/1
- Estrogen use: 0 0/1
Using Age ≥50 (0/1) = 0, HR ≥100 (0/1) = 0, O2 sat <95% (0/1) = 0, Unilateral leg swelling (0/1) = 0, Hemoptysis (0/1) = 0, Recent surgery/trauma (0/1) = 0, Prior PE/DVT (0/1) = 0, Estrogen use (0/1) = 0, the calculated result is PERC count: 0 | All criteria absent: Yes.
Sample result: Calculating…
Frequently asked questions
What does the Perc calculate?
Perc — free online calculator.
Which values should I enter?
Enter Age ≥50, HR ≥100, O2 sat <95%, Unilateral leg swelling, Hemoptysis, Recent surgery/trauma, Prior PE/DVT, Estrogen use using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: PERC: if ALL 8 criteria absent in low pre-test probability → PE excluded without D-dimer (Kline 2004).
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.