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Free ionized calcium (Ca²⁺)
- Target
- Ca²⁺
- Molecular classification
- Other (elemental ion; not a receptor, enzyme, transporter, or classic drug target)
01
Overview
Free ionized calcium (Ca²⁺) is the physiologically active fraction of calcium in blood and tissues, constituting roughly half of serum calcium; it is not bound to proteins and is available to participate directly in vital biological processes. Free ionized calcium is essential for muscle contraction, blood coagulation, neural transmission, bone mineralization, signal transduction, and hormone secretion. Its homeostasis is tightly regulated by hormones, especially parathyroid hormone and vitamin D. Deviations from normal ionized calcium levels can result in serious clinical consequences, including tetany, arrhythmias, neurological dysfunction, and tissue calcification. Ionized calcium is measured directly in blood tests to diagnose and monitor conditions affecting calcium metabolism.
- Other names
- Ionized calciumfree calciumCa²⁺unbound calcium
02
Mechanism of action
Supplements: Increase circulating free calcium directly Vitamin D analogs: Enhance gut absorption of calcium Calcitonin: Decrease serum calcium by enhancing renal excretion and inhibiting bone resorption Bisphosphonates: Inhibit bone resorption, reducing calcium release Parathyroid hormone analogs: Stimulate bone resorption and renal reabsorption
03
Biological functions
Signal transduction (second messenger in intracellular pathways)Muscle contraction (skeletal, smooth, cardiac)Blood coagulation (co-factor for enzymes in the clotting cascade)Neuromuscular transmissionBone mineralization and homeostasisHormone secretion (second messenger)Cell division and proliferation (calcium signaling)Metabolic enzyme regulation (cofactor)
04
Disease associations
Cardiovascular disease (arrhythmias, contractility disorders)Cancer (as a consequence of malignancy—paraneoplastic hypercalcemia, e.g., lymphoma)Renal disease (disrupted calcium homeostasis)Endocrine disorders (hyperparathyroidism, hypoparathyroidism)Neurological disorders (tetany, excitotoxicity)Other (bone disease: osteoporosis, osteomalacia)
05
Safety considerations
Hypercalcemia: Cardiac arrhythmias, neuropsychiatric symptoms, renal impairment, tissue calcificationHypocalcemia: Tetany, muscle spasms, seizures, cardiac dysfunctionMonitoring issues: Ionized calcium measurement can be technically challenging and affected by pre-analytical factors (sample handling, pH changes, etc.)
06
Interacting drugs
Calcium supplements (calcium chloride, calcium gluconate)
4 more in the full profile.
07
Biomarkers
Ionized calcium level (direct biomarker of calcium homeostasis)Parathyroid hormone (regulator and indirect marker of calcium homeostasis)Vitamin D statusSerum total calcium (less specific than ionized calcium)
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