What is the difference between type and screen and crossmatch in blood banking?

• A. Type and screen identifies ABO/Rh and antibodies; crossmatch tests donor blood compatibility; crossmatch is done when transfusion is anticipated
• B. Type and screen only identifies blood type; crossmatch tests antibody presence
• C. Crossmatch identifies ABO/Rh; type and screen tests donor cells
• D. Type and screen is not used unless there is bleeding

Answer: (A)

The basic idea is two-step safety before giving blood. First, type and screen determines the patient’s blood type (ABO and Rh) and looks for any antibodies in the patient’s plasma that could react with donor red cells. This step tells you what kinds of donor blood to avoid and flags potential incompatibilities early.

Second, crossmatching tests a specific donor blood unit against the patient’s blood. It checks whether the donor’s red cells will react with the patient’s antibodies. A compatible crossmatch means that unit can be safely transfused.

So, type and screen identifies the patient’s ABO/Rh and any antibodies, while the crossmatch confirms that a chosen donor unit is compatible with the patient before transfusion. This process is done when transfusion is planned; in emergencies, different facilitation steps may be used, but the principle remains: screen for antibodies and then verify compatibility with a matched donor unit.

Why the other statements don’t fit: type and screen is not only about blood type and does not test donor cells; it also screens for antibodies, not just type. Crossmatch is about donor–recipient compatibility, not simply identifying antibodies in general. And type and screen is used in preparation for potential transfusion, not only when bleeding occurs.