Question

question 10
2 points
which of the following is a test to determine a patients blood type by mixing the patients red blood cells with antisera?
a precipitation reaction
b neutralization reaction
c passive agglutination reaction
d direct agglutination reaction
e immunofluorescence

Explanation:

Blood typing mixes patient red blood cells (with surface antigens) directly with antisera (specific antibodies). This causes clumping (agglutination) if antigens match antibodies—direct agglutination. Other options don’t fit: precipitation involves soluble antigens; neutralization blocks toxins; passive agglutination uses carrier particles; immunofluorescence uses fluorescent labels.

Answer:

D. direct agglutination reaction