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Gestation calculator shown by health worker

Gestation calculator shown by health worker

M807/0157

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Credit

FAYE NORMAN / SCIENCE PHOTO LIBRARY FAYE NORMAN / SCIENCE PHOTO LIBRARY

Caption

Gestation calculator. Health care worker (at right) shows a gestation calculator to a pregnant woman. This is a device for accurately determining the expected date of delivery for pregnant women. Gestation is the period from conception to birth and lasts about 270 days (9 months). However, because of the difficulty in determining the precise date of conception it is usually timed as 40 weeks from the first day of the last menstrual period. Turning the dial on this calculator to the date of the last period results in a reading for the expected date of delivery.

Release details

Model release available. Property release not required.

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