FIRST TRIMESTER

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(GB):

IPA (US):

 Dictionary entry overview: What does first trimester mean? 

• FIRST TRIMESTER (noun)
  The noun FIRST TRIMESTER has 1 sense:

1. time period extending from the first day of the last menstrual period through 12 weeks of gestation

  Familiarity information: FIRST TRIMESTER used as a noun is very rare.

 Dictionary entry details 

• FIRST TRIMESTER (noun)

Sense 1

Meaning:

Time period extending from the first day of the last menstrual period through 12 weeks of gestation

Classified under:

Nouns denoting time and temporal relations

Hypernyms ("first trimester" is a kind of...):

trimester (a period of three months; especially one of the three three-month periods into which human pregnancy is divided)

 Context examples 

Transplacental infection of the fetus with rubella usually in the first trimester of pregnancy, as a consequence of maternal infection, resulting in various developmental abnormalities in the newborn infant.

(Congenital Rubella, NLM, Medical Subject Headings)

This is the most common cause in the first trimester.

(Miscarriage, NIH: National Institute of Child Health and Human Development)

Of women who had elevated blood pressure in the first trimester (120/80 to 129/80 mmHg), 30.3% developed a hypertensive disorder of pregnancy, a 42% higher risk than for women with normal blood pressure (less than 120/80 mmHg).

(Elevated blood pressure in first trimester increases risk for blood pressure disorder later in pregnancy, National Institutes of Health)

The mice were exposed during gestation, between 10 days after fertilization and birth, which corresponds to the middle of the first trimester and birth in humans.

(Low-level arsenic exposure before birth associated with early puberty and obesity in female mice, NIH)

Severe, intractable vomiting during pregnancy (usually the first trimester) accompanied by dehydration, weight loss, and electrolyte imbalances.

(Hyperemesis Gravidarum, NCI Thesaurus)

These risks were in comparison to infants who were either not exposed to tobacco or alcohol during gestation or whose mothers quit tobacco or alcohol use by the end of the first trimester.

(Combined prenatal smoking and drinking greatly increases SIDS risk, National Institutes of Health)

Elevated blood pressure in the first trimester of pregnancy, or an increase in blood pressure between the first and second trimesters, raises the chances of a high blood pressure disorder of pregnancy.

(Elevated blood pressure in first trimester increases risk for blood pressure disorder later in pregnancy, National Institutes of Health)

In addition to the almost 12-fold increased SIDS risk from combined smoking and drinking beyond the first trimester of pregnancy, they determined that the risk of SIDS was increased five-fold in infants whose mothers reported they continued smoking beyond the first trimester, and four-fold in infants whose mothers reported they continued drinking beyond the first trimester.

(Combined prenatal smoking and drinking greatly increases SIDS risk, National Institutes of Health)

For example, even among women with normal blood pressure in the first trimester, an increase in systolic pressure (the top number) was associated with a 41% higher risk of any hypertensive disorder of pregnancy, compared to women with a decrease in systolic pressure between the first and second trimester.

(Elevated blood pressure in first trimester increases risk for blood pressure disorder later in pregnancy, National Institutes of Health)

Children born to mothers who both drank and smoked beyond the first trimester of pregnancy have a 12-fold increased risk for Sudden Infant Death Syndrome (SIDS) compared to those unexposed or only exposed in the first trimester of pregnancy.

(Combined prenatal smoking and drinking greatly increases SIDS risk, National Institutes of Health)