1Goldstein SR,snyder JR, Watson C,et al. Very early pregnancy detection with endovaginal ultrasound. Obstet Gynecol, 1988,72 (8) :200 ～ 204.
2Barnhart KT, Simhan H, Kamelle SA. Diagnostic accuracy of ultrasound above and below the beta - HCG discriminatory zone. Obstet Gynecol,1999,94( 1 ) :583 ～ 587.
3Spandorfer SD, barnhart KT. Endometrial stripe thickness as a predictor of ectopic pregnancy. Fertil Steril, 1996,66 (9) :474 ～ 477.
4Dart RG, Dart L, Berty G. The predictive value of endometrial stripe thickness in patients with suspected ectopic pregnancy who have an empty uterus at ultrasonography. Acad Emerg Med,1999,58(6) :602 ～608.
5Levgur M ,Tsai T,Kang K,et al. Endometrial stripe thickness in tubal and intrauterine pregnancies. Fertil Steril,2000,74 (5) :889 ～ 891.
6Mehta TS, Levine D, McArdle CR. Lack of sensitivity of endometrial thickness in predicting the presence of an ectopic pregnancy. Jultrasound Med,1999,18(2) :117 ～ 122.
2Florio P,Severi FM,Bocchi C,et al.Single serum activin a testing to predict ectopic pregnancy[J].J Clin Endocrinol Metab,2007,92(5):1748-1753.
3Kirk E,Papageorghiou AT,Van Calster B,et al.The use of serum inhibin A and activin A levels in predicting the outcome of ′pregnancies of unknown location[J].Hum Reprod,2009,24(10):2451-2456.
4Katsikis I,Rousso D,Farmakiotis D,et al.Creatine phosphokinase in ectopic pregnancy revisited:significant diagnostic value of its MB and MM isoenzyme fractions[J].Am J Obstet Gynecol,2006,194(1):86-91.
5Kurzel RB,Mazdisnian F,Paige S,et al.Serum creatine kinase is not a reliable indicator of ectopic pregnancy[J].Int J Fertil Womens Med,2001,46(6):300-303.
6Malatyalioglu E,Ozer S,Kokcu A,et al.CA-125 levels in ruptured and unruptured tubal ectopic pregnancies[J].J Obstet Gynaecol Res,2006,32(4):422-427.
7Madendag Y,Col-Madendag I,Kanat-Pektas M,et al.Predictive power of serum CA-125 and LDH in the outcome of first trimester pregnancies with human chorionic gonadotropin levels below discriminatory zone[J].Arch Gynecol Obstet,2009,279(5):661-666.
8Kirk E,Papageorghiou AT,Condous G,et al.The diagnostic affectiveness of an initial transvaginal scan in detecting ectopic pregnancy[J].Hum Reprod,2007,22(11):2824-2828.
9Thoma ME.Early detection of ectopic pregnancy visualizing the presence of a tubal ring with ultrasonography performed by emergency physicians[J].Am J Emerg Med,2000,18(4):444-448.
10Mehta TS,Levine D,McArdle CR.Lack of sensitivity of endometrial thickness in predicting the presence of an ectopic pregnancy[J].Ultrasound Med,1999,l8(2):117-122.
