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Gloassary term:

Serum Ca2+

Serum Ca2+ refers to the concentration of ionised calcium in the blood, representing the biologically active form essential for cellular functions like muscle contraction and neurotransmission. Clinically, measuring serum Ca2+ is crucial for diagnosing and managing disorders of calcium metabolism, such as hypocalcaemia or hypercalcaemia. Abnormal levels can cause cardiac arrhythmias or neuromuscular symptoms.

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