Examples of trimester in the following topics:
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- Breast tenderness is common during the first trimester.
- The first 12 weeks of pregnancy are known as the first trimester.
- During this trimester, fetal development can be divided into different stages.
- Weeks 13 to 28 of the pregnancy are called the second trimester.
- By the end of the second trimester, the expanding uterus has created a visible baby bump.
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- In many societies' medical or legal definitions, human pregnancy is somewhat arbitrarily divided into three trimester periods as a means to simplify reference to the different stages of prenatal development.
- The first trimester carries the highest risk of miscarriage (natural death of embryo or fetus).
- During the second trimester, the development of the fetus is more easily monitored.
- The beginning of the third trimester often approximates the point of viability, or the ability of the fetus to survive, with or without medical help, outside of the uterus.
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- It can sometimes occur in the latter part of the first trimester, but usually occurs during the second or third trimester.
- In the last trimester of pregnancy, the isthmus of the uterus unfolds and forms the lower segment.
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- Since chorionic villus sampling is performed earlier in the pregnancy than amniocentesis, typically during the first trimester, it can reasonably be expected that there will be a higher rate of miscarriage after chorionic villus sampling than after amniocentesis.
- Other testing may combine a first trimester blood test with one done in the second trimester to determine if further action needs to be taken.
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- Gestational diabetes (or gestational diabetes mellitus, GDM) is a condition in which women without previously diagnosed diabetes exhibit high blood glucose levels during pregnancy (especially during the third trimester).
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- In the first trimester fetus, the liver is the main site of red blood cell production.
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- Urine formation begins towards the end of the first trimester (weeks 11 to 12) and continues throughout fetal life.
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- Further research results indicate that the central cholinergic mechanism is established and functional in the regulation of the hypothalamic neuropeptides during the final trimester of pregnancy.
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- It affects approximately 6-8% of all pregnancies worldwide, with onset of symptoms in the late second or third trimester, most commonly after the 32nd week.
- HELLP usually begins during the third trimester; rare cases have been reported as early as 23 weeks gestation.
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- One theory for this is the "4th trimester theory" which notes that most animals are born with significant mobility, but humans are relatively helpless at birth; this suggests that there may have once been a fourth trimester, but children began to be born earlier, evolutionarily, to accommodate the development of larger heads and brains and allow them to pass through the birth canal and this leaves them with partially undeveloped digestive systems.