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Page JM, The risk of stillbirth and infant death by each additional week of expectant management in twin pregnancies. Risk of late-preterm stillbirth and neonatal morbidity for monochorionic and dichorionic twins. The gestational age should ,therefore, be at least 10 to 12 weeks if fetal heart tone are heard. Kramer MS, Mc Lean FH, Boyd ME, Usher RH: The validity of gestational age estimation by menstrual dating in term, preterm and postterm gestations. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination.
Number 9, October 1999 (replaces Technical Bulletin Number 188, January 1994). Time of implantation of the conceptus and loss of pregnancy. Daily immunoactive and bioactive human chorionic gonadotropin profiles in periimplantation urine samples. The gestational age would, therefore, be at least 3 to 4 weeks at the time of a reliable h CG pregnancy test. Twins When a twin pregnancy is the result of in vitro fertilization determination of gestational age should be made from the date of embryo transfer. Clinical management guidelines for obstetricians-gynecologists. Number 55, September 2004 (replaces practice pattern number 6, October 1997).