A blood test performed to identify antigen–antibody reactions is:
A) sedimentation rate.
B) hematocrit.
C) immunoglobulins.
D) antinuclear antibodies.
D
Explanation:
A) A sedimentation rate tests the rate at which RBCs settle in a tube.
B) Hematocrit tests the percent of RBCs in a sample of blood.
C) The immunoglobulins test determines the presence of specific immunoglobulins.
D) Correct.
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Fill in the blank(s) with correct word
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A. 
B. 
C. 
D. 