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7 Common Third trimester tests introduction
During the last trimester of pregnancy your doctor may recommend that you have certain diagnostic tests. These tests are all safe and have been developed to ensure the optimum well-being of both mother and baby.
Listed are some of the most common tests women who are pregnant will given.
Group B streptococcus screening
Group B streptococcus (GBS) is a type of bacteria that can exist in the female reproductive tract without causing symptoms. Up to 30% of healthy women can carry group B strep, and it usually does not cause problems. However, sometimes it can lead to serious infection of the bloodstream, infection of the placenta, or urinary tract infection. Group B strep can also have serious consequences for the baby, causing potentially life-threatening infections in the newborn, including meningitis, pneumonia, and sepsis. Testing is simple and involves taking a sample from the vagina and from the rectum with a cotton swab. The swab is cultured in the laboratory to determine if group B strep is present. If the test is positive, you will be given antibiotics during labor to reduce the chances of infection in the baby. The test is usually done between the 35th and 37th weeks of pregnancy and should be done in subsequent pregnancies even if you test negative in your first pregnancy.
Electronic fetal heart rate monitoring
Electronic fetal heart rate monitoring is often done to confirm that the baby is healthy. This type of monitoring is also done during labor and delivery. It can be done any time after the 20th week of gestation during prenatal checkups.
The nonstress test (NST)
The nonstress test (NST) involves a fetal monitor strapped to the mother's abdomen to measure the baby's heart rate as it moves. It is called "nonstress" because no stress is placed on the fetus for the test. This test is sometimes performed on a weekly basis in high-risk pregnancies. It is done after the 28th week of pregnancy, though most often after 32 weeks. Measurements are typically taken for 20 to 30 minutes. A NST may be ordered if you feel the baby is not moving normally, if you are past your due date, or if your doctor wants to ensure that the placenta is healthy and functioning well. There are no known risks of the NST for the mother or the baby.
A biophysical profile
A biophysical profile combines the information from a NST with an ultrasound examination of the baby for a more precise evaluation.
A contraction stress test (CST)
A contraction stress test (CST), like the NST, measures fetal heart rate. However in this test, the baby's heart rate is measured in response to uterine contractions that are elicited by administering oxytocin (Pitocin) or by stimulation of the nipples. The test is sometimes referred to as an oxytocin challenge test. Normally, the flow of blood to the placenta slows during contractions, but if the placenta is functioning well, the baby's heart rate remains stable. If there is poor function of the placenta, the baby's heart rate will temporarily slow after a contraction. Looking at the baby's heart rate in response to uterine contractions can help the doctor estimate how the baby will respond to the stresses experienced during labor. This test is not performed as commonly as the NST or biophysical profile.
Although amniocentesis (removal of a sample of amniotic fluid with a long, thin needle) is most often done during the second trimester, there are certain conditions that may warrant an amniocentesis later in pregnancy. These conditions include a suspicion of chorioamnionitis or a risk of premature delivery, since amniocentesis fluid can be used to estimate maturity of the fetal lungs.
Ultrasound examinations may be performed in the third trimester if needed to help evaluate fetal growth and look for problems with the placenta.
Quick GuideFetal Development Stages: Month by Month Embryo Pictures
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"Protect Your Baby from Group B Strep!" CDC.gov. Updated Jul. 11, 2016.
Common Third Trimester Tests - Experience
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Common Third Trimester Tests - Group B Strep
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Top Third Trimester Tests During Pregnancy Related Articles
Gestational diabetes is a condition that is first recognized during pregnancy and is characterized by high blood sugar. Approximately 4% of all pregnancies are diagnosed with gestational diabetes. Low blood sugar is prevented by hormones produced by the placenta during a woman's pregnancy. The actions of insulin are stopped by these hormones. Gestational diabetes is the result of the pancreas' inability to produce enough insulin to overcome the effect of the increase hormones during pregnancy.
Risk factors for gestational diabetes include obesity, previous history of gestational diabetes, having a parent or sibling with type 2 diabetes, personal history of polycystic ovary syndrome (PCOS), and ethnicity.
There typically are no signs and symptoms of gestational diabetes. Treatment includes diet modifications and if necessary, insulin.
Group B StrepGroup B strep are bacteria called Streptococcus agalactiae that may sometimes cause infections both in a pregnant woman and her newborn. Symptoms include fever, seizures, heart rate abnormalities, breathing problems, and fussiness. Intravenous antibiotics are used to treat group B strep infections.
High Blood Pressure Hypertension
High blood pressure (hypertension) is a disease in which pressure within the arteries of the body is elevated. About 75 million people in the US have hypertension (1 in 3 adults), and only half of them are able to manage it. Many people do not know that they have high blood pressure because it often has no has no warning signs or symptoms.
Systolic and diastolic are the two readings in which blood pressure is measured. The American College of Cardiology released new guidelines for high blood pressure in 2017. The guidelines now state that blood normal blood pressure is 120/80 mmHg. If either one of those numbers is higher, you have high blood pressure.
The American Academy of Cardiology defines high blood pressure slightly differently. The AAC considers 130/80 mm Hg. or greater (either number) stage 1 hypertension. Stage 2 hypertension is considered 140/90 mm Hg. or greater.
If you have high blood pressure you are at risk of developing life threatening diseases like stroke and heart attack.
REFERENCE: CDC. High Blood Pressure. Updated: Nov 13, 2017.
Labor and Delivery
Early and later symptoms and signs of labor and delivery are unique to each woman. Early signs of labor are "lightening” and passing the mucous plug.
Later symptoms and signs that labor that labor is are the woman’s water breaking, and when contractions begin.
There are three stages of labor, stage 1 is the longest and occurs when the cervix begins to thin and dilate. During stage 2 of labor the baby passes through the birth canal and remains there until delivery, and stage 3, is when the baby is delivered.
Signs and symptoms of pregnancy vary by stage (trimester). The earliest pregnancy symptom is typically a missed period, but others include breast swelling and tenderness, nausea and sometimes vomiting, fatigue, and bloating.
Second trimester symptoms include backache, weight gain, itching, and possible stretch marks.
Third trimester symptoms are additional weight gain, heartburn, hemorrhoids, swelling of the ankles, fingers, and face, breast tenderness, and trouble sleeping.
Eating a healthy diet, getting a moderate amount of exercise, also are recommended for a healthy pregnancy. Information about the week by week growth of your baby in the womb are provided.
Pregnancy Planning (Preparing for Pregnancy)
Pregnancy planning is an important step in preparation for starting or expanding a family. Planning for a pregnancy includes taking prenatal vitamins, eating healthy for you and your baby, disease prevention (for both parents and baby) to prevent birth defects and infections, avoiding certain medications that may be harmful to your baby, how much weight gain is healthy exercise safety and pregnancy, travel during pregnancy.
Pregnancy: Birthing and Parenting ClassesPreparing for a baby is an important step in parents' lives. Choosing the right birthing class and method (Lamaze, Bradley, etc.) is important for the mother, baby, and father or support giver. Parenting classes are also information for first time parents. Information is provided about diapering, feeding, and bathing your baby as well as the different stages of child development.
Pregnancy: Preeclampsia and Eclampsia
Preeclampsia is a condition in pregnant women marked by high blood pressure and a high level of protein in the urine. Eclampsia occurs when preeclampsia goes untreated. Eclampsia can cause coma and death of the mother and baby. Preeclampsia symptoms include rapid weight gain, abdominal pain, headaches, blood in the urine, dizziness, and excessive vomiting and nausea. The only real cure for preeclampsia and eclampsia is the birth of the baby.
Stages of PregnancySee pictures on the various stages of pregnancy. See and learn what changes a woman's body goes through and view fetal images of how her baby grows during the 1st, 2nd and 3rd trimesters.
Third Trimester (32 Weeks) PictureThe Baby at 32 Weeks. Your baby's bones are fully formed, but still soft. See a picture of Third Trimester (32 Weeks) and learn more about the health topic.
UltrasoundUltrasound (and ultrasonography) is imaging of the body used in the medical diagnosis and screening of diseases and conditions such as:
- heart valve irregularities,
- carotid artery disease,
- heart disease,
- kidney stones,
- liver disease,
- diseases of the female reproductive, and
- diseases of the male reproductive organs.
Women's health is an important topic area to guide a woman through the stages of her life, as well as knowing the conditions and diseases that may occur. Educating yourself so that the transitions into different phases of life is key to a healthy, happy, and productive life.