Hypocalcaemia (low calcium) is also seen due to poor absorption of vitamin D and calcium, and secondary to low protein binding of calcium.
低血钙有时也会发生，因为维生素D和钙质的吸收不良和低蛋白结合钙。
英语百科
Plasma protein binding
A drug's efficiency may be affected by the degree to which it binds to the proteins within blood plasma. The less bound a drug is, the more efficiently it can traverse cell membranes or diffuse. Common blood proteins that drugs bind to are human serum albumin, lipoprotein, glycoprotein, and α, β‚ and γ globulins.