Ionized calcium normal range is approximately?

Ionized calcium normal range is approximately?

• A. 1.1-1.3 mmol/L
• B. 0.9-1.1 mmol/L
• C. 1.5-1.7 mmol/L
• D. 2.0-2.2 mmol/L

Answer: (A)

Ionized calcium is the physiologically active portion of calcium in the blood, not bound to proteins, and it’s the form that tissues actually respond to. It represents roughly half of the total calcium, with the rest bound to albumin or complexed. Because ionized calcium can shift with changes in pH and albumin, clinicians measure it directly when precise activity is needed. The normal range for ionized calcium is about 1.1 to 1.3 mmol/L, which is roughly 4.4 to 5.2 mg/dL. This range reflects the active calcium level, distinct from total calcium, which is higher because it includes the bound portion.

Ionized calcium is the physiologically active portion of calcium in the blood, not bound to proteins, and it’s the form that tissues actually respond to. It represents roughly half of the total calcium, with the rest bound to albumin or complexed. Because ionized calcium can shift with changes in pH and albumin, clinicians measure it directly when precise activity is needed. The normal range for ionized calcium is about 1.1 to 1.3 mmol/L, which is roughly 4.4 to 5.2 mg/dL. This range reflects the active calcium level, distinct from total calcium, which is higher because it includes the bound portion.