What is the definition of hypocalcemia?

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Multiple Choice

What is the definition of hypocalcemia?

Explanation:
Hypocalcemia means the blood calcium level is below the normal lower limit. In most labs, total calcium normally ranges from about 8.5 to 10.5 mg/dL, so a value below roughly 8.5 mg/dL defines hypocalcemia. This threshold reflects the point where calcium-dependent processes, like nerve and muscle excitability and cardiac conduction, can be affected. It’s important to consider albumin, because total calcium depends on albumin binding. If albumin is low, total calcium may be low even with normal physiologically active ionized calcium. In that situation, measure ionized calcium or use a corrected calcium calculation (approximately measured calcium + 0.8 × [4 − albumin in g/dL]) to avoid misclassification.

Hypocalcemia means the blood calcium level is below the normal lower limit. In most labs, total calcium normally ranges from about 8.5 to 10.5 mg/dL, so a value below roughly 8.5 mg/dL defines hypocalcemia. This threshold reflects the point where calcium-dependent processes, like nerve and muscle excitability and cardiac conduction, can be affected. It’s important to consider albumin, because total calcium depends on albumin binding. If albumin is low, total calcium may be low even with normal physiologically active ionized calcium. In that situation, measure ionized calcium or use a corrected calcium calculation (approximately measured calcium + 0.8 × [4 − albumin in g/dL]) to avoid misclassification.

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