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Human chorionic gonadotropin (HCG), the biologic marker on which pregnancy tests are based, can be detected in the BLOOD as early as which nber of DAYS after the last menstrual period?

  • A. 15
  • B. 10
  • C. 20
  • D. 5
Correct Answer: B

Rationale: Human chorionic gonadotropin (HCG) can be detected in the blood as early as 10 days after the last menstrual period. This hormone is produced by the placenta shortly after the embryo attaches to the uterine lining. Pregnancy tests detect HCG levels to determine pregnancy status, and the hormone can be detected earlier in the blood compared to urine tests. Detecting HCG in the blood at around 10 days post ovulation is often the earliest point when a blood test can confirm pregnancy.