Wells Score (PE)
Pre-test probability
Clinician mode
Caution
0
PE unlikely — do D-dimer
- In pregnancy: D-dimer unreliable — image (V/Q preferred if normal CXR, else CTPA).
- Empirical LMWH if imaging delayed >24 h and no bleeding risk.
Reference range
>4 = PE likely · ≤4 = PE unlikely (two-level Wells)
Common pitfalls
- Not validated in pregnancy — image if any suspicion.
- D-dimer unreliable in pregnancy.