The Complement Fixation Test Uses Red Blood Cells as the Target

question 3

Multiple Choice

The complement fixation test uses red blood cells as the target for complement activation. Test serum containing antibodies is combined with a known amount of antigen in a tube, and then the RBCs and antibodies against the RBCs are added. A positive result for the complement fixation test would be

• A) a line of precipitate near the bottom of the tube.
• B) a cloudy solution in the tube.
• C) a solution that is clear due to precipitation of RBCs.
• D) a fluorescent precipitate.
• E) loss of color in the tube.

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