Question

Sodium oxalate prevents clotting of blood in vitro by
removing which of the following factor?
(1) l
(2) VIII
(3) X
(4) IV​

Answer 1

Explanation:

Sodium oxalate (like citrates) can be used to remove calcium ions (Ca

2+

$$2+) from the blood plasma. The oxalate prevents clotting by forming insoluble calcium salts, thus removing ionic calcium (or cations).