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25. Commentary on "Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy". Kadar N, DeVore G, Romero R. Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy. Obstet Gynecol 1981;58:156-61. Pitkin RM Obstet Gynecol; 2003 Oct; 102(4):672. PubMed ID: 14550993 [No Abstract] [Full Text] [Related]
26. Intramural pregnancy with negative maternal serum beta-hCG. A case report. Hsieh YY; Chang CC; Tsai HD; Yeh LS; Hsu TY; Yang TC J Reprod Med; 1998 May; 43(5):468-70. PubMed ID: 9610475 [TBL] [Abstract][Full Text] [Related]
28. What is the optimal protocol for diagnosis of ectopic pregnancy? Abrahamson L; Newton W J Fam Pract; 2001 Jul; 50(7):570. PubMed ID: 11485699 [No Abstract] [Full Text] [Related]
30. Diagnosis of ectopic pregnancy by vaginal ultrasonography in combination with a discriminatory serum hCG level of 1000 IU/l (IRP). Soussis I; Dimitry ES; Oskarsson T; Margara R; Winston R Br J Obstet Gynaecol; 1991 Feb; 98(2):233. PubMed ID: 2004066 [No Abstract] [Full Text] [Related]
31. [Diagnosis of early extrauterine pregnancy by hCG determination in serum and Douglas puncture fluid]. Strowitzki T; Korell M; Hepp H Geburtshilfe Frauenheilkd; 1992 Mar; 52(3):182-3; author reply 183-4. PubMed ID: 1597280 [No Abstract] [Full Text] [Related]
32. Short answer question case series: Abnormal first-trimester pregnancy. Sato AK; Jang TB Emerg Med J; 2012 Nov; 29(11):935-7. PubMed ID: 23100475 [No Abstract] [Full Text] [Related]