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22. [All rules have exceptions. Ectopic pregnancy in spite of negative HCG]. Flam F; Lundberg S Lakartidningen; 1999 Mar; 96(10):1195. PubMed ID: 10193125 [No Abstract] [Full Text] [Related]
23. Tubal ectopic pregnancy: diagnosis and management. Nama V; Manyonda I Arch Gynecol Obstet; 2009 Apr; 279(4):443-53. PubMed ID: 18665380 [TBL] [Abstract][Full Text] [Related]
24. [Tubal pregnancies: early pregnancy factor, progesterone, beta-HCG and vaginal sonography as differential diagnostic parameters]. Mesrogli M; Degenhardt F; Maas DH; Klaus I; Busche M; Schneider J Z Geburtshilfe Perinatol; 1988; 192(3):130-2. PubMed ID: 2463715 [TBL] [Abstract][Full Text] [Related]
25. [Determination of hCG with anti-hCG-beta serum sensitized erythrocytes--application to a pregnancy test in the early stage]. Kudo S; Maekawa I Horumon To Rinsho; 1976 Nov; 24(11):1157-60. PubMed ID: 1034516 [No Abstract] [Full Text] [Related]
26. An extra-uterine pregnancy in an ectopic fallopian tube. Knudsen HJ; Clausen IH Zentralbl Gynakol; 1994; 116(9):544-5. PubMed ID: 7975967 [TBL] [Abstract][Full Text] [Related]
27. [The technology of the gravindex immunologic test]. Dimitrov DIa Akush Ginekol (Sofiia); 1974; 13(3):235-6. PubMed ID: 4467742 [No Abstract] [Full Text] [Related]
33. [HGC determination in early pregnancy. Comparative studies on a new latex agglutination test and hemagglutination inhibition test]. Schüler R Fortschr Med; 1974 Sep; 92(26):1033-4. PubMed ID: 4409757 [No Abstract] [Full Text] [Related]
34. [Simplified immunology for the diagnosis of pregnancy]. Vázquez E; Vázquez P Ginecol Obstet Mex; 1978 Jun; 43(260):419-28. PubMed ID: 689434 [TBL] [Abstract][Full Text] [Related]
35. Ectopic pregnancy with undetectable serum and urine beta-hCG levels and detection of beta-hCG in the ectopic trophoblast by immunocytochemical evaluation. Maccato ML; Estrada R; Faro S Obstet Gynecol; 1993 May; 81(5 ( Pt 2)):878-80. PubMed ID: 7682319 [TBL] [Abstract][Full Text] [Related]