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Introduction

Age of Fetus

A  “full-term” human pregnancy ranges from 216 to 306 days with a modal length of 266 days. Fertilization age of the fetus uses the event of fertilization as time zero. Menstrual age uses the start of the mother’s last normal menstrual period (LNMP) as time zero, meaning that menstrual age is approximately two weeks older than fertilization age.

 

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Send comments to Dr. Tom Gest <gest@umich.edu>.
Last modified: Thursday, 06-Jan-2000 13:11:32 EST