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  Pregnancy tests: Explanation
How do pregnancy tests work?

Pregnancy tests look for a special hormone (hCG) in the urine or blood that is only present when a woman is pregnant. After the fertilized egg is implanted in the uterus, the placenta begins to develope and excretes hCG. The test will bind the hormone from the urine or blood to an antibody, which finally, in connection with an indicator, displays the result on a display.

See also:

Pregnancy tests - Accuracy

Pregnancy tests - Factors influencing

Pregnancy tests - Types


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