The biologic error in gestational length related to the use of the first day of last menstrual period as a proxy for the start of pregnancy.

Abstract

OBJECTIVE In a large unselected population of normal spontaneous pregnancies, to estimate the biologic variation of the interval from the first day of the last menstrual period to start of pregnancy, and the biologic variation of gestational length to delivery; and to estimate the random error of routine ultrasound assessment of gestational age in mid… (More)

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@article{Nakling2005TheBE, title={The biologic error in gestational length related to the use of the first day of last menstrual period as a proxy for the start of pregnancy.}, author={Jakob Nakling and Harald Buhaug and Bjorn Backe}, journal={Early human development}, year={2005}, volume={81 10}, pages={833-9} }