Why does testing for hCG (human chorionic gonadotropin)work as a pregnancy test early in pregnancy but not late inpregnancy? What is the function of hCG in pregnancy?

Basic Clinical Laboratory Techniques 6E
6th Edition
ISBN:9781133893943
Author:ESTRIDGE
Publisher:ESTRIDGE
Chapter4: Basic Immunology And Immunohematology
Section4.4: Tests For Human Chorionic Gonadotropin
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Why does testing for hCG (human chorionic gonadotropin)
work as a pregnancy test early in pregnancy but not late in
pregnancy? What is the function of hCG in pregnancy?

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