First Trimester Definition in Medical Conditions Dictionary

First Trimester:

Period of pregnancy from the first day of the last normal menstrual period through the completion of 14 weeks (98 days) of gestation.

Terms Related to First Trimester

Third Trimester Pregnancy
Period of pregnancy from the beginning of the 29th through the 42nd completed week (197 to 294 days) of gestation.
Second Trimester Pregnancy
Period of pregnancy from the beginning of the 15th through the 28th completed week (99 to 196 days) of gestation.
Third Trimester
Period of pregnancy from the beginning of the 29th through the 42nd completed week (197 to 294 days) of gestation.
Second Trimester
Period of pregnancy from the beginning of the 15th through the 28th completed week (99 to 196 days) of gestation.

» Additional tags: define 1st trimester, trimester definition.

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