Not all pregnancies progress the same way — while many are smooth and uncomplicated, some are associated with health problems that may endanger the mother, baby, or both. Antenatal risk assessment is therefore the process of identifying pregnant women who are more likely to develop complications during pregnancy, labour, or after delivery. By recognizing these risks early, health workers can provide special care, close monitoring, or timely referral to prevent poor outcomes.
Objectives of Antenatal Risk Assessment
- Identify high-risk pregnancies early for appropriate intervention.
- Prevent complications by managing risk factors before they worsen.
- Promote safe delivery through planning and preparation.
- Reduce maternal and perinatal morbidity and mortality.
- Guide counseling and health education for the mother and family.
Classification of Risk Factors
Risk factors can arise from the mother’s history, current pregnancy, or pre-existing conditions.
a. Social and Demographic Risk Factors
- Age below 18 years (teenage pregnancy) or above 35 years (advanced maternal age).
- Low socioeconomic status or poor nutrition.
- Lack of education or inadequate awareness of health services.
- Single motherhood or lack of family support.
- Substance use — alcohol, tobacco, or drugs.
These factors can affect both maternal health and access to care.
b. Obstetric and Reproductive Risk Factors
- Previous obstetric complications, e.g.:
- Pre-eclampsia or eclampsia.
- Postpartum haemorrhage (PPH).
- Prolonged or obstructed labour.
- Preterm delivery or stillbirth.
- History of cesarean section or uterine surgery.
- Multiple pregnancies (twins or more).
- Short interpregnancy interval (less than 18 months).
- Grand multiparity (five or more deliveries).
c. Medical and Surgical Risk Factors
- Chronic hypertension or diabetes mellitus.
- Heart disease.
- Renal disease.
- Epilepsy or other neurological disorders.
- Thyroid disorders.
- Anaemia (low haemoglobin level).
- HIV/AIDS, hepatitis, or tuberculosis.
- Previous pelvic or abdominal surgery.
d. Current Pregnancy Risk Factors
- During the current pregnancy, certain findings may indicate increased risk:
- Oedema, protein in urine, or high blood pressure → possible pre-eclampsia.
- Excessive vomiting (hyperemesis gravidarum).
- Bleeding during early or late pregnancy.
- Abnormal fundal height — too large (polyhydramnios or multiple gestation) or too small (growth restriction).
- Abnormal fetal lie or presentation.
- Decreased fetal movement.
- Positive syphilis or HIV test.
Risk Assessment Tools
Health professionals use structured tools to guide evaluation.
- Risk scoring systems assign numerical values to various risk factors.
- The antenatal card or maternity record book includes sections for risk identification.
- WHO recommends routine screening and classification at every antenatal contact — women are categorized as:
- Low-risk pregnancy – requires normal care.
- High-risk pregnancy – needs specialized monitoring or referral.
Screening During Pregnancy
Screening is the systematic use of tests to detect hidden problems in apparently healthy women. It complements risk assessment and helps detect medical or fetal conditions early.
a. Maternal Screening
| Condition | Test/Screening Method | Timing/Remarks |
|---|---|---|
| Anaemia | Haemoglobin estimation | Every visit or at least once each trimester |
| Hypertension | Blood pressure monitoring, urine protein | Every visit |
| Gestational diabetes | Blood glucose test | Around 24–28 weeks |
| Infections (HIV, syphilis, hepatitis B) | Blood tests | At first visit and as needed |
| Bacteriuria or UTI | Urine test | At booking and as indicated |
| Malaria (in endemic areas) | Rapid diagnostic test | As needed |
| Nutritional deficiency | Weight monitoring, dietary assessment | Every visit |
b. Fetal Screening
| Aspect | Method/Tool | Purpose |
|---|---|---|
| Fetal growth and wellbeing | Fundal height measurement, ultrasound | Detect growth restriction or macrosomia |
| Fetal heartbeat | Fetoscope/Doppler | Monitor fetal viability |
| Congenital abnormalities | Ultrasound (18–22 weeks) | Detect structural defects |
| Amniocentesis / genetic testing | When indicated (e.g., maternal age >35 or family history) | Detect chromosomal disorders |
Management of High-Risk Pregnancies
When a woman is identified as high-risk:
- Close monitoring — more frequent antenatal visits.
- Referral — to a higher-level facility with specialized care.
- Early management of complications (e.g., treating anaemia, controlling BP).
- Health education and counseling — explain the risks and necessary precautions.
- Delivery planning — ensure skilled attendance, adequate blood supply, and emergency transport.
Importance of Risk Assessment and Screening
- Prevents unexpected complications during labour and delivery.
- Ensures timely intervention and reduces maternal and perinatal deaths.
- Improves resource allocation — high-risk women receive priority care.
- Strengthens maternal confidence through awareness and preparedness.
Key Points Summary
- Risk assessment begins at the first antenatal visit and continues throughout pregnancy.
- It identifies high-risk women who need extra monitoring or referral.
- Screening tests detect hidden medical or fetal problems early.
- Proper management of high-risk cases significantly improves pregnancy outcomes.
🧭 Conclusion
In summary, antenatal risk assessment and screening represent the body's extraordinary capacity to nurture new life. By comprehending these adaptations, healthcare providers can better support mothers through this transformative period, ensuring healthy outcomes for both mother and child.
Antenatal risk assessment and screening showcase the ingenuity in identifying and managing potential complications during pregnancy.