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2. The predictive value of hCG beta subunit levels in pregnancies achieved by in vitro fertilization and embryo transfer: an international collaborative study. Confino E, Demir RH, Friberg J, Gleicher N. Fertil Steril; 1986 Apr; 45(4):526-31. PubMed ID: 2420652 [Abstract] [Full Text] [Related]
3. Doubling time of human chorionic gonadotropin (hCG) in early normal pregnancy: relationship to hCG concentration and gestational age. Fritz MA, Guo SM. Fertil Steril; 1987 Apr; 47(4):584-9. PubMed ID: 2436952 [Abstract] [Full Text] [Related]
4. Predictive value of human chorionic gonadotrophin in the outcome of early pregnancy after in-vitro fertilization and spontaneous conception. Zegers-Hochschild F, Altieri E, Fabres C, Fernández E, Mackenna A, Orihuela P. Hum Reprod; 1994 Aug; 9(8):1550-5. PubMed ID: 7527424 [Abstract] [Full Text] [Related]
7. Serial transvaginal ultrasound scans and beta-human chorionic gonadotropin levels in early singleton and multiple pregnancies. Keith SC, London SN, Weitzman GA, O'Brien TJ, Miller MM. Fertil Steril; 1993 May; 59(5):1007-10. PubMed ID: 7683615 [Abstract] [Full Text] [Related]
13. Improved sensitivity and specificity of a single measurement of serum progesterone over serial quantitative beta-human chorionic gonadotrophin in screening for ectopic pregnancy. Stovall TG, Ling FW, Andersen RN, Buster JE. Hum Reprod; 1992 May; 7(5):723-5. PubMed ID: 1379268 [Abstract] [Full Text] [Related]
14. The efficacy of early pregnancy monitoring with serial chorionic gonadotropin determinations and real-time sonography in an infertility population. Pittaway DE, Wentz AC, Maxson WS, Herbert C, Daniell J, Fleischer AC. Fertil Steril; 1985 Aug; 44(2):190-4. PubMed ID: 2410301 [Abstract] [Full Text] [Related]
17. Further observations on the doubling time of human chorionic gonadotropin in early asymptomatic pregnancies. Kadar N, Freedman M, Zacher M. Fertil Steril; 1990 Nov; 54(5):783-7. PubMed ID: 2226912 [Abstract] [Full Text] [Related]