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In rare cases, the date of coitus is known, and this may be useful in calculating the length of pregnancy.

For related information, see Medscape's Pregnancy Resource Center.

The fallacy in this assumption is that the time of ovulation varies greatly in relation to the menstrual cycle, both from cycle to cycle and individual to individual.Basing GA on the LMP tends to result in an overestimation.The estimation of pregnancy dates is important for the mother, who wants to know when to expect the birth of her baby, and for her health care providers, so they may choose the times at which to perform various screening tests and assessments,such as serum screening, assessment of maturity, and induction of labor for postdate pregnancies.The 3 basic methods used to help estimate gestational age (GA) are menstrual history, clinical examination, and ultrasonography.Size can be misleading in the presence of multiple pregnancy, uterine fibroids, or a full bladder.

Tape measurement of the symphysis-fundus height may be useful up to 28-30 weeks' gestation, beyond which it becomes too inaccurate for dating.In normal pregnancies, the length of gestation is minimally affected by maternal characteristics.However, obese women are significantly more likely to go post-term.The date of the first documented positive pregnancy test and the beta-human chorionic gonadotropin (b HCG) level may help ascertain the minimum gestational age.In women who conceived following assisted reproduction techniques, the date of embryo transfer is known and may date the pregnancy accurately.In patients who have had ovulation induction, calculate GA from the day of human chorionic gonadotropin administration.