Alvarado Score
Appendicitis likelihood (MANTRELS)
Clinician mode
Low risk
0
Unlikely
- In women of reproductive age: always βHCG + pelvic US to exclude ectopic/adnexal pathology.
- US then MRI preferred in pregnancy — avoid CT if possible.
Reference range
Unlikely 0–3 · Equivocal 4–6 · Likely 7–10 (MANTRELS)
Common pitfalls
- Sensitivity ~68% for women — always image if unclear.
- βHCG + pelvic US in reproductive-age women.