Re: which is really reliable?

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• In reply to: Carla: "which is really reliable?"

The latter. In women who religiously record their menses as they happen(IOW, know exactly when their last menstrual period was) Only 85% will be accurate as a due date. This is because 15% of women who get pregnant will either have a period the first month they are pregnant or will skip a period the month before they get pregnant. US at less than 12 weeks is accurate to plus or minus 5-10 days depending on how much less than 12 weeks it is done. Most accurate around 7-9 weeks.

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R.Daniel Braun, MD  FACOG   FOG
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• Next message: R. Daniel Braun, MD: "Re: mid cycle bleeding and pain"
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• In reply to: Carla: "which is really reliable?"