What is the primary purpose of using a 'parallel test' in blood crossmatching?

A To detect ABO incompatibility
B To identify unexpected antibodies
C To confirm the presence of Rh antibodies
D To verify the compatibility of donor and recipient blood ✓

Explanation

The parallel test is used to verify the compatibility of donor and recipient blood by simultaneously testing the patient's serum against the donor's red cells and the donor's serum against the patient's red cells.

Source

Medical Laboratory Technology textbook
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Medium MEDICAL Confidence: high