Calcium ion (clotting factor IV) (Ca2+)

Calcium ion (clotting factor IV) is not a protein or traditional receptor, but rather an essential cofactor orchestrating multiple steps in the coagulation cascade. Ca2+ enables gamma-carboxylated coagulation factors (e.g., factors II, VII, IX, X) and membrane surfaces (phosphatidylserine on activated platelets) to bind each other, localize to damaged vasculature, and form the protein complexes necessary for progressive thrombin generation and fibrin formation. Without Ca2+, secondary hemostasis fails and stable clot formation is impossible. To summarize, "clotting promotion via Ca2+" is not a precise drug target, but a description of calcium’s biochemical necessity in normal and abnormal coagulation. The only direct clinical interventions relate to calcium’s removal (anticoagulation of blood samples, transfusion protocols) or supportive management of calcium balance, not to drugs selectively targeting a “receptor” or molecular target in the classic sense.

Other names

CalciumCa2+Clotting factor IV

Chelators stop clotting by binding free Ca2+ and preventing its biological function in the cascade