Serologic Testing to Diagnose Pregnancy

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Known antibodies against the beta chain of the HCG in the urine react with the HCG. Red latex particles are attached to these antibodies. Known antibodies against the alpha chain of the HCG are fixed to the membrane above and below the printed blue "minus" sign. As the HCG molecules with bound antibody and red latex move across the membrane with the urine, the alpha chain of the HCGs bind to the fixed antibodies on the membrane creating the "plus" sign.

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Updated: Nov. 15, 2006
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