The Importance of Antenatal Care: A Trimester-by-Trimester Guide
Antenatal care (ANC) — also called prenatal care — is the systematic supervision and care of a woman during pregnancy. The World Health Organization recommends a minimum of eight antenatal contacts during pregnancy to reduce perinatal mortality and improve the overall experience of care.
First Trimester (Weeks 1–12)
The first trimester is a critical period of fetal development. Early registration and the booking visit should ideally happen before 12 weeks.
Key assessments include:
- Confirmation of pregnancy and estimation of gestational age via ultrasound
- Complete blood count, blood group and Rh typing
- Screening for infections — HIV, Hepatitis B, syphilis (VDRL), and rubella immunity
- Thyroid function tests (TSH)
- Fasting blood sugar and urine examination
- First-trimester screening (NT scan) between 11–13 weeks for chromosomal abnormalities
Folic acid supplementation (400–800 mcg daily) should begin even before conception and continue through the first trimester to prevent neural tube defects.
Second Trimester (Weeks 13–28)
Often called the “golden period” of pregnancy, the second trimester usually brings relief from early symptoms like nausea.
Important milestones:
- Anomaly scan (TIFFA) at 18–22 weeks to assess fetal anatomy in detail
- Glucose challenge test or oral glucose tolerance test (OGTT) at 24–28 weeks to screen for gestational diabetes
- Monitoring blood pressure for early signs of pre-eclampsia
- Iron and calcium supplementation to support fetal growth
- Tdap vaccination (tetanus, diphtheria, pertussis) between 27–36 weeks
Third Trimester (Weeks 29–40)
As delivery approaches, visits become more frequent — typically every two weeks until 36 weeks, then weekly until delivery.
Focus areas include:
- Monitoring fetal growth through fundal height measurement and growth scans
- Assessing fetal position and presentation
- Non-stress test (NST) if indicated
- Group B Streptococcus (GBS) screening at 35–37 weeks
- Birth planning — discussing delivery preferences, signs of labor, and when to go to the hospital
Warning Signs That Require Immediate Attention
Seek immediate medical care if you experience severe headache or visual disturbances, vaginal bleeding, sudden swelling of face or hands, decreased fetal movements, rupture of membranes (water breaking), or persistent abdominal pain.
Regular antenatal care allows early identification and management of complications, ensuring the best possible outcomes for both mother and baby.
