What is the purpose of using a saline control in the crossmatching procedure for blood transfusion?

A To detect the presence of antibodies against red blood cell antigens
B To verify the compatibility of the donor and recipient blood
C To determine the suitability of the blood for transfusion
D To check for bacterial contamination of the blood sample
The saline control is used to verify the compatibility of the donor and recipient blood by checking for any adverse reactions between the two.
American Association of Blood Banks (AABB) guidelines
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Easy MEDICAL Confidence: high