What is measured to assess calcium status in the blood?

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Calcium status in the blood is determined by measuring the calcium level in serum. This blood test directly assesses how much calcium is circulating, which helps detect hypo- or hypercalcemia. Imaging methods like radiographs or CT scans look at bone structure and anatomy, not the amount of calcium in the blood, so they don’t reflect current calcium status. When testing, you’ll see total serum calcium, which includes calcium bound to proteins and free ionized calcium; because albumin levels can affect the total value, sometimes the ionized (free) calcium portion is considered for a more accurate assessment. In short, the essential measure for calcium status is a serum calcium test.