Anatomy During the active phase of labor the minimum effective dilatation of cervix in primigravida should be at the rate of A 0.5 cm/hr B 1cm/hr C 1.5 cm/hr D 2 cm/ hr 💡 Explanation During the active phase of labor the minimum effective dilatation of cervix in primigravida should be at the rate of ✓ Correct Answer: B. 1cm/hr