Gynaecology & Obstetrics Related to calcium metabolism, which of the following does not occur during pregnancy A Total serum calcium levels fall. B 80% of fetal calcium deposition occurs in third trimester. C Fetal skeleton excretes approximately 30g of calcium by term. D Serum ionized calcium levels fall. 💡 Explanation Related to calcium metabolism, which of the following does not occur during pregnancy ✓ Correct Answer: D. Serum ionized calcium levels fall.