Antenatal OPD is a daily responsibility for MBBS interns, yet remembering gestational age, trimester classification, ANC visit timing, investigations, supplements, and referral criteria can be difficult during busy clinics.
This page is designed as a professional, exam-oriented and OPD-ready pregnancy guide for interns and junior doctors.
LMP to Gestational Age & EDD Calculator
ANC Visit Schedule Calculator (With Gestational Age)
Note:
The ANC visit dates shown represent the ideal mid-point of the recommended gestational age window, not a fixed appointment day.
The ANC visit dates shown represent the ideal mid-point of the recommended gestational age window, not a fixed appointment day.
Trimester Classification
| Trimester | Gestational Age |
|---|---|
| First Trimester | Conception – 12 weeks |
| Second Trimester | 13 – 27 weeks |
| Third Trimester | 28 – 40 weeks |
Recommended ANC Visit Timing
| Visit | Timing | Trimester |
|---|---|---|
| 1st Visit | Before 12 weeks | First |
| 2nd Visit | 20–24 weeks | Second |
| 3rd Visit | 28–32 weeks | Third |
| 4th Visit | 36 weeks | Third |
Mandatory ANC Investigations
First Trimester (≤12 weeks)
- Hemoglobin
- Blood group & Rh typing
- Urine routine & microscopy
- Blood sugar (RBS/FBS)
- HIV
- HBsAg
- VDRL
- Dating ultrasound
Second Trimester (18–22 weeks)
- Anomaly scan (Level II ultrasound)
24–28 weeks
- Oral Glucose Tolerance Test (OGTT)
- Repeat Hemoglobin (if indicated)
Third Trimester (32–36 weeks)
- Hemoglobin
- Urine routine
- Growth scan (if clinically indicated)
Essential Supplements in Pregnancy
- Iron + Folic Acid: From 2nd trimester till delivery
- Calcium: From 14 weeks onwards
- Vitamin D: If deficient / high-risk
- Td / TT vaccination: As per national schedule
When to Refer Immediately
- Blood pressure ≥140/90 mmHg
- Severe anemia (Hb <7 g/dL)
- Bleeding per vaginum
- Decreased fetal movements
- Severe headache, convulsions
- Suspected pre-eclampsia / eclampsia
Final Note for MBBS Interns
This page follows standard textbook definitions and national guidelines. Bookmark it for daily OPD use and quick clinical revision.
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