They began to notice a pattern of fluctuations throughout a woman's 28 day menstrual cycle and saw a sharp spike in the level of HCG (human chorionic gonadotropin) in pregnant women, and nowhere else.

他们开始注意到女性28天的月经周期中有一种波动模式，孕妇的 HCG（人绒性腺激素）水平急剧上升，而其他人则不会。

AFP, though, can be elevated by other conditions as well, so in order to get a more exact diagnosis, additional blood tests for human chorionic gonadotropin, or HCG, inhibin A, and estriol, as well as an ultrasound are usually done.

但甲胎蛋白也会由不少其它原因而升高，所以为了得到更准确的诊断，还需检查人绒性腺激素（HCG）、抑制素A、雌三醇水平，或作超声检查。

This can also be done prenatally by testing fetal DNA obtained through either chorionic villus sampling or amniocentesis.

这可以在产前通过检测胎儿DNA完成，如绒绒取样或羊穿刺术。

So, for example, a pinealoma may lead to increased secretion of the hormone beta human chorionic gonadotropin that can cause an early onset of puberty.

比如，松果体瘤可能导致β人绒性腺激素分泌增加，可引起青春期发育提前。