C61660Level 7
Calcium Cation
**Semantic type:** Element, Ion, or Isotope
**Definition:** The metabolically-active portion of calcium, not bound to proteins, circulating in the blood.
**Synonyms:** - CA+2 - CALCIUM CATION - Ca++ - Ca2+ - Ca2+ - Ca2+ - Calcium 2+ - Calcium Ion - Free Calcium - Ionized Calcium
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