Pregnancy and Birth Sourcebook Part 11

Questions to ask providers in free-standing birth centers: * What are your requirements for birth in this center?

* How often do women in your birth center go to a hospital during labor?

* When do you advise women to go into the hospital?

* What are your arrangements if I have a problem that requires being in a hospital?

Questions to ask providers who attend homebirths: * How do you handle problems during labor? When would we go to the hospital?

* What drugs and equipment do you use in the home?

* Do you have a formal agreement with an obstetrician/gynecologist to provide care if problems occur?

* Which hospital will I be transported to if a problem occurs during labor?

* Would you stay with me if we transfer?

* Are you trained in newborn resuscitation?

* How many times do you visit after my baby is born?

For More Information * www.MyMidwife.org-A website with information on midwifery, maternity, women's health, and family-centered care. There is a "find a midwife" link, where you can search for a midwife by location.

* www.ChildbirthConnection.org-A not-for-profit organization that has worked to improve maternity care for mothers, babies, 138 Choosing a Pregnancy Health Care Provider and families since 1918. They promote safe, effective, and satisfying evidence-based maternity care.

* www.ourbodiesourselves.org-Our Bodies Ourselves (OBOS), also known as the Boston Women's Health Book Collective (BWHBC), is a nonprofit, public interest women's health education, advocacy, and consulting organization.

* www.jmwh.org-A link to other, free Share With Women col- umns.

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Chapter 17.

Prenatal Medical Tests and Care during Pregnancy Every parent-to-be hopes for a healthy baby, but it can be hard not to worry: What if the baby has a serious or untreatable health problem? What would I do? Is there anything I can do to prevent problems?

Concerns like these are completely natural. Fortunately, though, a wide array of tests for pregnant women can help to rea.s.sure them and keep them informed throughout their pregnancies.

Prenatal tests can help identify health problems that could endanger both you and your unborn child, some of which are treatable. However, these tests do have limitations. As an expectant parent, it's important to educate yourself about them and to think about what you would do if a health problem is detected in either you or your baby.

Why Are Prenatal Tests Performed?

Prenatal tests can identify several different things: * treatable health problems in the mother that can affect the baby's health; * characteristics of the baby, including size, s.e.x, age, and placement in the uterus; "Prenatal Tests," July 2008, reprinted with permission from www.kidshealth .org. Copyright 2008 The Nemours Foundation. This information was provided by KidsHealth, one of the largest resources online for medically reviewed health information written for parents, kids, and teens. For more articles like this one, visit www.KidsHealth.org, or www.TeensHealth.org.

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Pregnancy and Birth Sourcebook, Third Edition * the chance that a baby has certain congenital, genetic, or chromosomal problems; * certain types of fetal abnormalities, including some heart problems.

The last two items on this list may seem the same, but there's a key difference. Some prenatal tests are screening tests and only reveal the possibility of a problem. Other prenatal tests are diagnostic, which means they can determine-with a fair degree of certainty-whether a fetus has a specific problem. In the interest of making the more specific determination, the screening test may be followed by a diagnostic test.

Prenatal testing is further complicated by the fact that more abnormalities can be diagnosed in a fetus than can be treated or cured.

What Do Prenatal Tests Find?

Among other things, routine prenatal tests can determine key things about the mother's health, including: * her blood type; * whether she has gestational diabetes; * her immunity to certain diseases; * whether she has a s.e.xually transmitted disease (STD) or cervical cancer.

All of these conditions can affect the health of the fetus.

Prenatal tests also can determine things about the fetus' health, including whether it's one of the 2% to 3% of babies in the United States that the American College of Obstetricians and Gynecologists (ACOG) says have major congenital birth defects.

Tests for Disorders Categories of defects which can be picked up by prenatal tests include the following disorders: Dominant Gene Disorders In dominant gene disorders when one parent is affected, there's a 5050 chance a child will inherit the gene from the affected parent and have the disorder.

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Prenatal Medical Tests and Care during Pregnancy Dominant gene disorders include: * Achondroplasia, a rare abnormality of the skeleton that causes a form of dwarfism, can be inherited from a parent who has it, but most cases occur without a family history.

* Huntington disease, a disease of the nervous system that causes a combination of mental deterioration and a movement disorder.

Recessive Gene Disorders Because there are so many genes in each cell, everyone carries some abnormal genes, but most people don't have a defect because the normal gene overrules the abnormal recessive one. But if a fetus has a pair of abnormal recessive genes (one from each parent), the child will have the disorder. It can be more likely for this to happen in children born to certain ethnic groups.

Recessive gene disorders include: * cystic fibrosis, most common among people of northern Euro-pean descent; this disease is life threatening and causes severe lung damage and nutritional deficiencies.

* sickle cell disease, most common among people of African descent, is a disease in which red blood cells form a "sickle" shape (rather than the typical donut shape) that can get caught in blood vessels and damage organs and tissues.

* Tay-Sachs disease, most common among people of eastern Euro-pean (Ashken.a.z.i) Jewish descent, can cause mental r.e.t.a.r.dation, blindness, seizures, and death.

* beta-thala.s.semia, most common among people of Mediterra- nean descent; this disorder can cause anemia.

X-Linked Disorders These disorders are determined by genes on the X chromosome.

The X and Y chromosomes are the chromosomes that determine s.e.x.

These disorders are much more common in boys because the pair of s.e.x chromosomes in males contains only one X chromosome (the other is a Y chromosome). If the disease gene is present on the one X chromosome, the X-linked disease shows up because there's no other paired gene to "overrule" the disease gene. One such X-linked disorder is hemophilia, which prevents the blood from clotting properly.

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Pregnancy and Birth Sourcebook, Third Edition Chromosomal Disorders Chromosomal disorders occur when there is an abnormality in the number or structure of chromosomes, which contain the genetic material. Some chromosomal disorders are inherited but most are caused by a random error in the genetics of the egg or sperm. The chance of a child having these disorders increases with the age of the mother.

For example, according to ACOG, 1 in 1,667 live babies born to 20-year-olds have Down syndrome, which causes mental r.e.t.a.r.dation and physical defects. That number changes to 1 in 378 for 35-year-olds and 1 in 106 for 40-year-olds.

Multifactorial Disorders This final category includes disorders that are caused by a mix of genetic and environmental factors. Their frequency varies from location to location, and some can be detected during pregnancy.

Multifactorial disorders include neural tube defects, which occur when the tube enclosing the spinal cord doesn't form properly. Neural tube defects, which often can be prevented by taking folic acid (which is in prenatal vitamins) around the time of conception and during pregnancy, include: * spina bifida. Also called "open spine," this defect happens when the lower part of the neural tube doesn't close during embryo development. The spinal cord and nerves may be covered only by skin, or may be open to the environment, leaving them unprotected.

* anencephaly. This defect occurs when the brain and head don't develop properly, and parts of the brain are completely absent or malformed.

Other multifactorial disorders include: * congenital heart defects; * obesity; * diabetes; * cancer.

Who Has Prenatal Tests?

Certain prenatal tests are considered routine-that is, almost all pregnant women receiving prenatal care get them. Other nonroutine 144 Prenatal Medical Tests and Care during Pregnancy tests are recommended only for certain women, especially those with high-risk pregnancies. These may include women who: * are age 35 or older; * are adolescents; * have had a premature baby; * have had a baby with a birth defect-especially heart or genetic problems; * are carrying more than one baby; * have high blood pressure, diabetes, lupus, heart disease, kidney problems, cancer, a s.e.xually transmitted disease, asthma, or a seizure disorder; * have an ethnic background in which genetic disorders are common (or a partner who does); * have a family history of mental r.e.t.a.r.dation (or a partner who does).

Although your health care provider (which may be your OB-GYN, family doctor, or a certified nurse-midwife) may recommend these tests, it's ultimately up to you to decide whether to have them.

Also, if you or your partner have a family history of genetic problems, you may want to consult with a genetic counselor to help you look at the history of problems in your family, and to determine the risk to your children.

To decide which tests are right for you, it's important to carefully discuss with your health care provider: * what these tests are supposed to measure; * how reliable they are; * the potential risks; * your options and plans if the results indicate a disorder or defect.

Prenatal Tests during the First Visit During your first visit to your health care provider for prenatal care, you can expect to have a full physical, which may include a pelvic and rectal examination, and you'll undergo certain tests regardless of your age or genetic background.

You may have a urine test to check for protein, sugar, or signs of infection.

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Pregnancy and Birth Sourcebook, Third Edition Blood tests check for: * your blood type and Rh factor. If your blood is Rh negative and your partner's is Rh positive, you may develop antibodies that prove dangerous to your fetus. This can be prevented through a course of injections given to you; * anemia (a low red blood cell count); * hepat.i.tis B, syphilis, and HIV [human immunodeficiency virus]; * immunity to German measles (rubella) and chickenpox (varicella); * cystic fibrosis. Health care providers now routinely offer this screening even when there's no family history of the disorder.

Cervical tests (also called Pap smears) check for: * STDs such as chlamydia and gonorrhea; * changes that could lead to cervical cancer.

To do a Pap smear, your health care provider uses what looks like a very long mascara wand or cotton swab to gently sc.r.a.pe the inside of your cervix (the opening to the uterus that's located at the very top of the v.a.g.i.n.a). This may be a little uncomfortable, but it is over quickly.

Prenatal Tests Performed throughout or Later in Pregnancy After the initial visit, your health care provider will order other tests based on, among other things, your personal medical history and risk factors, as well as the current recommendations. These tests may include: * urine tests for sugar, protein, and signs of infection. The sugar in urine may indicate gestational diabetes-diabetes that occurs during pregnancy; the protein can indicate preeclampsia-a condition that develops in late pregnancy and is characterized by a rise in blood pressure, with fluid retention and protein in the urine.

* group B streptococcus (GBS) infection. GBS bacteria are found naturally in the v.a.g.i.n.as of many women but can cause serious infections in newborns. This test involves swabbing the v.a.g.i.n.a and r.e.c.t.u.m, usually between the 35th and 37th weeks of pregnancy. If 146 Prenatal Medical Tests and Care during Pregnancy the test comes back positive, it is important to go to the hospital as soon as your labor begins so that intravenous antibiotics can be started in order to reduce the chance of the baby being infected.

* sickle cell trait tests for women of African or Mediterranean descent, who are at higher risk for having sickle cell anemia-a chronic blood disease-or carrying the trait, which can be pa.s.sed on to their children.

Other Tests Here are some other tests that might be performed during pregnancy.

Ultrasound Why Is This Test Performed?

In this test, sound waves are bounced off the baby's bones and tissues to construct an image showing the baby's shape and position in the uterus. Ultrasounds were once used only in high-risk pregnancies but have become so common that they're often part of routine prenatal care.

Also called a sonogram, sonograph, echogram, or ultrasonogram, an ultrasound is used: * to determine whether the fetus is growing at a normal rate; * to verify the expected date of delivery; * to record fetal heartbeat or breathing movements; * to see whether there might be more than one fetus; * to identify a variety of abnormalities that might affect the remainder of the pregnancy or delivery; * to make sure the amount of amniotic fluid in the uterus is adequate; * to indicate the position of the placenta in late pregnancy (which may be blocking the baby's way out of the uterus); * to detect pregnancies outside the uterus; * as a guide during other tests such as amniocentesis.

Ultrasounds also are used to detect: 147.

Pregnancy and Birth Sourcebook, Third Edition * structural defects such as spina bifida and anencephaly; * congenital heart defects; * gastrointestinal and kidney malformations; * cleft lip or palate.

Should I Have This Test?

Most women have at least one ultrasound. The test is considered to be safe. Some women will have multiple ultrasounds during the pregnancy, others do not have any. Ask your health care provider if he or she thinks you will have ultrasounds during your pregnancy.

When Should I Have This Test?

An ultrasound is usually performed at 18 to 20 weeks to look at your baby's anatomy. If you want to know your baby's gender, you may be able to find out during this time-that is, if the genitals are in a visible position.

Ultrasounds also can be done sooner or later and sometimes more than once, depending on the health care provider and the pregnancy.

For example, some providers will order an ultrasound to date the pregnancy, usually during the first 3 months. And others may want to order one during late pregnancy to make sure the baby's turned the right way before delivery.

Women with high-risk pregnancies may need to have multiple ultrasounds using more sophisticated equipment. Results can be confirmed when needed using special three-dimensional (3-D) equipment that allows the technician to get a more detailed look at the baby.

How Is This Test Performed?

Women need to have a full bladder for a transabdominal ultrasound (an ultrasound of the belly) to be performed in the early months- you may be asked to drink a lot of water and not urinate. You'll lie on an examining table and your abdomen will be coated with a special ultrasound gel. A technician will pa.s.s a wand-like instrument called a transducer back and forth over your abdomen. You may feel some pressure as the technician presses on the bladder. High-frequency sound waves "echo" off your body (and the fetus) and create a picture of the fetus inside on a computer screen. You may want to ask to have the picture interpreted for you, even in late pregnancy-it often doesn't look like a baby to the untrained eye.

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Prenatal Medical Tests and Care during Pregnancy Sometimes, if the technician isn't able to see a good enough image from the ultrasound, he or she will determine that a transv.a.g.i.n.al ultrasound is necessary. This is especially common in early pregnancy.

For this procedure, your bladder should be empty. Instead of a transducer being moved over your abdomen, a slender probe called an endov.a.g.i.n.al transducer is placed inside your v.a.g.i.n.a. This technique often provides improved images of the uterus and ovaries.

Some health care providers may have the equipment and trained personnel necessary to provide in-office ultrasounds, whereas others may have you go to a local hospital or radiology center. Depending on where you have the ultrasound done, you may be able to get a printed picture (or multiple pictures) of your baby and/or a disc of images you can view on your computer and even send to friends and family.

When Are the Results Available?

Although the technician can see the images immediately, a full evaluation by a physician may take up to 1 week.

Depending on where you have the ultrasound done, the technician may be able to tell you that day whether everything looks OK. However, most radiology centers or health care providers prefer that technicians not comment until a specialist has taken a look-even when everything is OK.

Glucose Screening Why Is This Test Performed?

Glucose screening checks for gestational diabetes, a short-term form of diabetes that develops in some women during pregnancy. Gestational diabetes is increasing in frequency in the United States, and may occur in 3 to 8% of pregnancies. Gestational diabetes can cause health problems for the baby, especially if it is not diagnoses or treated.

Should I Have This Test?

Most women have this test in order to diagnose and treat gestational diabetes, reducing the risk to the baby.

When Should I Have This Test?

Screening for gestational diabetes usually takes place at 24 to 28 weeks. Testing may be done earlier for women who are at higher risk of having gestational diabetes, such as those who: 149.

Pregnancy and Birth Sourcebook, Third Edition * have previously had a baby that weighs more than 9 pounds (4.1 kilograms); * have a family history of diabetes; * are obese; * are older than age 25; * have sugar in the urine on routine testing; * have high blood pressure; * have polycystic ovary syndrome.

How Is the Test Performed?

This test involves drinking a sugary liquid and then having your blood drawn after an hour. If the sugar level in the blood is high, you'll have a glucose-tolerance test, which means you'll drink a glucose solution on an empty stomach and have your blood drawn once every hour for 3 hours.

When Are the Results Available?

The results are usually available within 1 to 2 days. Ask if your health care provider will call you with the results if they are normal or only if the reading is high and you need to come in for another test.

Chorionic Villus Sampling (CVS) Why Is This Test Performed?