Gynaecology & Obstetrics General ac583282 Target magnesium level when used for eclampsia prophylaxis A 4.8 → 8.4 mg / dL B 2.0 → 4.0 mg / dL C 8.4 → 10.0 mg / dL D None of the above High-Yield Explanation Serum magnesium levels are measured at 4 → 6 hour and adjusted to maintain levels between 4 and 7m Eq / L .