Nyberg D A, Filly R A, Laing F C, Mack L A, Zarutskie P W
J Ultrasound Med. 1987 Mar;6(3):145-50. doi: 10.7863/jum.1987.6.3.145.
Pelvic sonograms were correlated with simultaneous human chorionic gonadotropin (HCG) determinations in 150 women with early intrauterine pregnancy (N = 76) and ectopic pregnancy (N = 74). Of the 76 patients with intrauterine pregnancy (IUP), 55 had HCG levels exceeding 1,800 mIU/ml (Second International Standard), and in each case a gestational sac was identified. In comparison, 35 of 74 (47%) patients with ectopic pregnancy had HCG levels of 1,800 mIU/ml or more, and no case demonstrated a gestational sac. Although six patients (8%) with ectopic pregnancy demonstrated a "pseudogestational sac," no case was confused with a true gestational sac. We conclude that, when the HCG level exceeds 1,800 mIU/ml, an intrauterine gestational sac is normally detected and its absence is evidence for an ectopic pregnancy.
对150例早期宫内妊娠（n = 76）和异位妊娠（n = 74）的女性进行盆腔超声检查，并同时测定人绒毛膜促性腺激素（HCG）。在76例宫内妊娠（IUP）患者中，55例的HCG水平超过1800 mIU/ml（第二国际标准），且每例均发现了妊娠囊。相比之下，74例异位妊娠患者中有35例（47%）的HCG水平达到或超过1800 mIU/ml，且无一例显示有妊娠囊。虽然6例（8%）异位妊娠患者显示有“假妊娠囊”，但无一例与真正的妊娠囊相混淆。我们得出结论，当HCG水平超过1800 mIU/ml时，通常可检测到宫内妊娠囊，未检测到则为异位妊娠的证据。
