Gynaecology & Obstetrics Single best prognostic indicator of successful treatment with single-dose Methotrexate is A Gestational sac size B Serum b-hCG level C Absence of fetal cardiac activity D Pain abdomen 💡 Explanation Single best prognostic indicator of successful treatment with single-dose Methotrexate is ✓ Correct Answer: B. Serum b-hCG level