What tests are done at 18 weeks of pregnancy?

Generally, 18 weeks of pregnancy refers to the 18th week of gestation. At 18 weeks pregnant, examinations such as ultrasound, urine tests, amniotic fluid index assessment, Down syndrome screening, and non-invasive prenatal DNA testing are typically recommended. The specific tests required may vary depending on each individual's condition. During pregnancy, it is important to follow medical advice and attend regular check-ups. If any abnormalities are detected during prenatal exams, prompt medical consultation and treatment under a doctor’s guidance are advised. Details are as follows:

1. Ultrasound Examination

Ultrasound allows for a detailed evaluation of the fetus's organs, limbs, skull, and overall growth and development.

2. Urine Test

Urine testing helps assess whether the mother is at risk for gestational hypertension or other pregnancy-related complications.

3. Amniotic Fluid Index Assessment

Amniotic fluid is the liquid surrounding the fetus and plays an important role in fetal growth and protection. At 18 weeks of gestation, doctors may measure the amniotic fluid index to evaluate the volume of amniotic fluid and assess fetal well-being.

4. Down Syndrome Screening

Around 18 weeks of pregnancy, expectant mothers should undergo Down syndrome screening to evaluate normal fetal development and detect potential neural tube defects.

5. Non-Invasive Prenatal DNA Testing

If the Down syndrome screening results are abnormal, further non-invasive DNA testing may be recommended to accurately determine whether the fetal chromosomes are normal.

It is recommended that pregnant women undergo regular prenatal check-ups, which help monitor maternal physiological changes and fetal development, allowing early detection of problems and timely intervention.