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Counter-immunoelectrophoresis is used for the detection of

  • A.Meningococcal antigen
  • B.Hepatitis B surface antigen
  • C.Alpha-fetoprotein
  • D.All of these

Answer: D

Correct answer: All of these

Counter-immunoelectrophoresis drives antigen and antibody towards each other electrophoretically, so a precipitin line forms in minutes instead of the many hours diffusion alone would take. That speed is why it was adopted for urgent diagnoses: meningococcal antigen in cerebrospinal fluid, hepatitis B surface antigen, and alpha-fetoprotein are all standard applications.

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