How much HCG should be taken to rule out ectopic pregnancy?

If HCG is greater than 15000IU/L, ectopic pregnancy can be ruled out with a high probability.

HCG determines whether ectopic pregnancy is excluded:

HCG refers to human chorionic gonadotropin, which can be measured in the mother's serum on the first day after the fertilized egg is implanted. It reaches a peak at 8-10 weeks of pregnancy, then drops rapidly and disappears within 2 weeks after delivery. The function of HCG is to maintain the life of the menstrual corpus luteum, grow the menstrual corpus luteum into the pregnancy corpus luteum, and increase the secretion of steroids to maintain pregnancy. It promotes the aromatization of androgens to estrogens and stimulates the formation of progesterone. HCG can also inhibit the stimulating effect of phytohemagglutinin on lymphocytes. Chorionic gonadotropin can be adsorbed on the surface of trophoblasts to prevent trophoblasts from being attacked by maternal lymphocytes. It stimulates the secretion of testosterone in the fetal testicles and promotes male fetal sexual differentiation. It can bind to the TSH receptors of maternal thyroid cells and stimulate thyroid activity. The HCG value of normal pregnancy blood sampling generally doubles every two days. In the fourth week of pregnancy, most HCG values ​​will be higher than 15000IU/L. It is highly likely that ectopic pregnancy can be ruled out, but in the end, it is still necessary to rely on B-ultrasound to find the specific location of the embryo.

Notes on HCG testing:

One week before the blood HCG test, pay attention to making reasonable work and rest arrangements, ensure adequate sleep, avoid overwork, and avoid staying up late for long periods of time.