How do home pregnancy tests detect pregnancy?

Shortly after the fertilized egg attaches to your uterine lining, your body begins to produce the hormone human chorionic gonadotropin (HCG). Home pregnancy tests — available without a prescription at most grocery stores and drugstores — can reliably detect this hormone in your urine one week after a missed period. A more sensitive blood test to detect HCG can be done earlier in the doctor's office.

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Shortly after the fertilized egg attaches to your uterine lining, your body begins to produce the hormone human chorionic gonadotropin (HCG). Home pregnancy tests — available without a prescription at most grocery stores and drugstores — can reliably detect this hormone in your urine one week after a missed period. A more sensitive blood test to detect HCG can be done earlier in the doctor's office.

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