Normal calcium range?

• A. 9-10.5
• B. 8-9
• C. 10-11.5
• D. 11-12

Answer: (A)

Normal blood calcium is typically described as total calcium in the 9 to 10.5 mg/dL range. This reflects the balance of hormones that keep calcium available for nerves, muscles, and bones. The 9–10.5 range is the standard value you’ll see for total calcium on exams, so it fits as the correct choice. The other ranges sit outside what's usually considered normal: 8–9 is more indicative of hypocalcemia and 10–11.5 or 11–12 suggest higher calcium levels. Keep in mind that total calcium can be affected by albumin levels; with low albumin, total calcium can appear low even if the active ionized calcium is normal, so sometimes we correct for albumin or measure ionized calcium when precision is needed.