Many expectant mothers worry about their baby’s health after discovering they are pregnant. There are now several methods available to detect abnormalities in the fetus.
The evaluation of fetal abnormalities has significantly advanced to ensure the safety of both the mother and baby. These methods include high-frequency ultrasound (ultrasound) to detect physical defects in the fetus and genetic testing to identify conditions like Down’s syndrome through amniocentesis. Amniocentesis involves analyzing amniotic fluid for chromosomal abnormalities and measuring alpha-fetoprotein (AFP) levels to check for brain and spinal cord defects.
Chromosomes are units of cells containing genetic information that is passed from one generation to the next. Errors can occur during this transfer, such as an extra chromosome 21 in Down’s Syndrome (Trisomy 21), where three chromosomes are present instead of the usual two. Amniocentesis is typically performed between the 16th and 18th weeks of pregnancy, with results available after 2-3 weeks. It is usually recommended for pregnant women at higher risk for genetic disorders, including:
- Women aged 35 or older
- Women with a history of genetic disorders in previous pregnancies
- Women with a history of a child with chromosomal abnormalities
- Women who have had a child with congenital disabilities
- Women who have been exposed to harmful chemicals or radiation early in pregnancy
Risk of down syndrome increases with maternal age. For example:
- In the general population, the risk is approximately 1 in 1,000
- For women over 35, the risk is about 1 in 365
- For women aged 39, the risk is about 1 in 139
- For women aged 45, the risk is about 1 in 32
Results from amniocentesis not only identify chromosomal abnormalities but also determine the baby’s sex and measure the level of alpha-fetoprotein (AFP). Abnormally high levels of AFP may indicate potential issues with the fetal brain and spinal cord.
Complications from amniocentesis are very rare, occurring in less than 0.5% of cases, depending on the doctor’s skill and experience. Potential complications include infection, amniotic fluid leakage (which could lead to miscarriage if severe). After the procedure, if you experience any of the following symptoms, seek medical attention immediately:
- Fever above 38.5°C (101.3°F)
- Severe headache that does not improve
- Blurred vision
- Swelling of feet and ankles
- Painful urination
- Severe, prolonged abdominal pain
- Fetal movement less than 3 times per hour after 28 weeks of pregnancy
- Heavy vaginal bleeding or significant amniotic fluid leakage
- These signs should be promptly evaluated by a healthcare provider to ensure both maternal and fetal health.
