Neural tube defects in fetus

What is Neural tube defects in fetus?

Neural tube defects are serious birth defects that affect the brain, spine, or spinal cord of a developing baby. These defects happen very early in pregnancy, usually within the first 28 days after conception. The neural tube is the structure in an embryo that eventually becomes the baby's brain and spinal cord. When this tube doesn't close properly, a neural tube defect occurs.

The two most common types are spina bifida and anencephaly. Spina bifida happens when the spinal column doesn't close completely. This can cause nerve damage and varying degrees of paralysis in the lower body. Anencephaly is a more severe condition where major parts of the brain and skull don't develop. Babies with anencephaly are usually stillborn or die shortly after birth.

Most neural tube defects can be prevented with proper nutrition before and during early pregnancy. Getting enough folate, also called folic acid or vitamin B9, is the most important factor. When women have adequate folate levels before conception, the risk of neural tube defects drops by up to 70 percent. This is why testing folate levels and taking supplements is so important for women planning to become pregnant.

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Symptoms

Visible opening in the spine at birth, often with exposed nerves
Partial or complete paralysis of the legs
Loss of bowel or bladder control
Fluid buildup in the brain, called hydrocephalus
Learning disabilities or developmental delays
Missing portions of the brain or skull
Abnormal curvature of the spine
Weakness or lack of movement in lower limbs

Neural tube defects are present at birth and are usually detected during pregnancy through ultrasound or maternal blood screening. Some milder forms of spina bifida may not be noticed until later in childhood. In cases of anencephaly, the defect is severe and incompatible with life.

Causes and risk factors

Neural tube defects occur when the neural tube fails to close properly during the first month of pregnancy. The exact cause isn't always clear, but low folate levels are the biggest known risk factor. Folate is essential for DNA synthesis and cell division, which happen rapidly in early pregnancy. Without enough folate, the cells that form the neural tube may not develop correctly. Other risk factors include a family history of neural tube defects, certain medications like anti-seizure drugs, poorly controlled diabetes in the mother, and obesity.

Some women have genetic variations that affect how their bodies process folate, putting them at higher risk. Having a previous pregnancy affected by a neural tube defect increases the risk in future pregnancies by about 3 to 4 percent. Environmental factors like extreme heat exposure in early pregnancy and certain infections may also play a role. The good news is that up to 70 percent of neural tube defects can be prevented by ensuring adequate folate intake before conception and during early pregnancy.

How it's diagnosed

Neural tube defects are typically diagnosed during pregnancy through ultrasound imaging and maternal blood tests. An ultrasound performed between 18 and 22 weeks of pregnancy can usually detect major neural tube defects. Maternal blood screening tests measure levels of alpha-fetoprotein, a protein produced by the fetus. Elevated levels may indicate a neural tube defect. Amniocentesis, where a small sample of amniotic fluid is tested, can provide more definitive diagnosis.

Prevention starts before pregnancy by checking folate levels through blood testing. Rite Aid offers folate and red blood cell testing as part of our add-on panel. This helps identify women who may need supplementation before trying to conceive. Women planning pregnancy should have their folate levels checked at least three months before conception. If levels are low, supplementation can bring them into the protective range. Testing at our network of Quest Diagnostics locations makes it easy to know your folate status.

Treatment options

Folic acid supplementation of 400 to 800 micrograms daily for all women of childbearing age
Higher doses of 4 milligrams daily for women with previous affected pregnancies
Eating folate-rich foods like leafy greens, beans, citrus fruits, and fortified grains
Surgery to repair spina bifida, sometimes performed before birth or shortly after
Physical therapy and mobility aids for children with spina bifida
Treatment for hydrocephalus with a surgical shunt to drain excess fluid
Occupational therapy to help with daily activities and independence
Regular monitoring by specialists including neurologists and orthopedic surgeons
Bladder and bowel management programs
Educational support and developmental services as needed

Frequently asked questions

The main preventable cause of neural tube defects is low folate levels in the mother during early pregnancy. Folate is essential for proper development of the neural tube, which forms the brain and spinal cord. When folate levels are too low, the neural tube may not close properly. This happens in the first 28 days after conception, often before a woman knows she is pregnant.

Most women should take 400 to 800 micrograms of folic acid daily starting at least one month before trying to conceive. Women who have had a previous pregnancy affected by a neural tube defect need a higher dose of 4 milligrams daily. Your doctor may also recommend higher doses if you have certain risk factors. It's important to start supplementation before pregnancy because neural tube formation happens very early.

Yes, most neural tube defects can be detected during pregnancy. Ultrasound imaging between 18 and 22 weeks can show major defects like spina bifida or anencephaly. Maternal blood tests measuring alpha-fetoprotein levels can suggest a problem. Amniocentesis provides more definitive diagnosis by testing the fluid surrounding the baby. Early detection helps families prepare and make informed decisions.

Women with low folate levels face the highest risk. Other risk factors include having a previous child with a neural tube defect, taking certain medications like anti-seizure drugs, and having poorly controlled diabetes. Obesity and having certain genetic variations that affect folate processing also increase risk. Women of Hispanic ethnicity have slightly higher rates, possibly due to genetic factors.

Women should test their folate levels at least three months before trying to conceive. This gives time to correct any deficiency through diet and supplementation. If you're already pregnant, testing can still be valuable for current and future pregnancies. Women with previous affected pregnancies or other risk factors should definitely test before conception.

Leafy green vegetables like spinach and kale are excellent sources of folate. Beans, lentils, and chickpeas provide significant amounts. Citrus fruits, avocados, and asparagus are also rich in folate. Many grain products like bread and cereal are fortified with folic acid. Eating a varied diet with these foods helps maintain healthy folate levels.

Spina bifida can be treated with surgery to close the opening in the spine. Sometimes this surgery is done before birth, which may improve outcomes. After birth, children may need ongoing treatment including physical therapy, mobility aids, and management of bladder and bowel function. Unfortunately, anencephaly is not treatable and is fatal. Early intervention for spina bifida helps children reach their full potential.

Neural tube formation happens very early, within the first 28 days after conception. By the time most women know they're pregnant, this critical period has passed. However, you should still take folic acid throughout pregnancy for other important functions. It supports continued brain development and reduces other birth defect risks. If you're planning another pregnancy, start taking folic acid right away.

Most prenatal vitamins contain 400 to 800 micrograms of folic acid, which is adequate for women at average risk. However, women who have had a previous affected pregnancy need 4 milligrams daily. This higher dose usually requires a separate prescription supplement. Check your prenatal vitamin label and talk to your doctor about whether you need additional supplementation.

Adequate folic acid prevents up to 70 percent of neural tube defects, but not all cases. Some defects occur even when folate levels are normal. Genetic factors, certain medications, and other unknown causes can still lead to neural tube defects. However, ensuring proper folate intake is the single most effective prevention strategy available. Every woman of childbearing age should maintain adequate folate levels.