Can the date of last menstrual period be trusted in the first trimester? Comparisons of gestational age measures from a prospective cohort study in six low-income to middle-income countries.

BMJ Open · 2023 · PMC10514667 · PMID 37730415

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20 Limitations of our study include the following: first, we focused on first trimester registrations because there is an increasing trend for women to register for antenatal care early in pregnancy, and USG dating in the first trimester is more accurate than later in pregnancy.

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