Master every high-yield obstetrics and gynecology topic for NEET PG 2026: normal labor, high-risk pregnancy, antepartum and postpartum hemorrhage, contraception, gynecological cancers, PCOD, and infertility workup with real exam facts.
Version 1.0 — Published April 2026
Obstetrics and Gynecology contributes 20-25 questions to NEET PG (2021-2024 analysis). To score 18+ marks, master these 8 high-yield areas:
Obstetrics and Gynecology is a subject where clinical scenarios dominate. NBE rarely tests isolated facts — instead, you get a pregnant woman at a specific gestational age with specific symptoms, and you must choose the next step. A 32-week primigravida with painless bleeding is placenta previa until proven otherwise. A postpartum woman with a boggy uterus and continuous bleeding is uterine atony. The gestational age, the symptom pattern, and the clinical context together determine the answer.
This guide covers the eight highest-yield OBG areas with the clinical detail NBE tests. Each section gives you the diagnostic criteria, the management protocols, and the discriminators that separate the correct answer from the close-but-wrong options. Pair it with the Obstetrics and Gynecology subject hub for daily MCQ practice.
Normal labor is the physiological process of delivery at term (37-42 weeks) through the birth canal. Understanding the stages, the partograph, and the cardinal movements is foundational — these concepts underpin all obstetric management questions.
This content is for educational purposes for NEET PG exam preparation. It is not a substitute for professional medical advice, diagnosis, or treatment. Clinical information has been reviewed by qualified medical professionals.
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| Stage | Definition | Duration (primigravida) | Duration (multigravida) |
|---|---|---|---|
| First stage | Onset of true labor to full cervical dilatation (10 cm) | 12-16 hours | 6-8 hours |
| — Latent phase | Onset to 4 cm dilatation | Up to 20 hours | Up to 14 hours |
| — Active phase | 4 cm to 10 cm dilatation | 1.2 cm/hour (Friedman) | 1.5 cm/hour |
| Second stage | Full dilatation to delivery of baby | Up to 2 hours | Up to 1 hour |
| Third stage | Delivery of baby to delivery of placenta | 15-30 minutes | 15-30 minutes |
| Fourth stage | First 1-2 hours after placenta delivery | Observation period | Observation period |
The active phase cervical dilatation rate is the most tested parameter. In a primigravida, dilatation should progress at least 1 cm/hour. Slower progress crosses the alert line on the partograph and warrants assessment. If progress crosses the action line (4 hours to the right of the alert line), intervention is indicated.
The WHO partograph is a graphical record of labor progress. NBE tests partograph interpretation in clinical vignettes.
The seven cardinal movements describe how the fetal head navigates the birth canal:
The suboccipitobregmatic diameter (9.5 cm) is the presenting diameter in a well-flexed vertex presentation (normal). In brow presentation, the presenting diameter is mentovertical (13.5 cm) — the largest diameter, making vaginal delivery impossible. In face presentation, the presenting diameter is submentobregmatic (9.5 cm), and vaginal delivery is possible only in mento-anterior position. These diameter-presentation associations are frequently tested.
The Bishop score assesses cervical readiness for induction of labor. Five parameters are scored: dilatation, effacement, station, consistency, and position of cervix.
High-risk pregnancy questions account for 5-7 marks in every NEET PG paper. Preeclampsia/eclampsia is the single most tested obstetric topic. NBE presents clinical scenarios and asks for diagnosis, management, or the next investigation.
Preeclampsia is a pregnancy-specific syndrome defined by new-onset hypertension (BP >=140/90 mmHg after 20 weeks of gestation) with proteinuria (>=300 mg/24 hours) or other end-organ dysfunction. It complicates 5-8% of pregnancies worldwide.
Severe preeclampsia criteria (any one):
Eclampsia is preeclampsia with generalized tonic-clonic seizures not attributable to other causes.
Management of eclampsia — magnesium sulfate (MgSO4):
The Pritchard regimen is the standard in India and the most tested protocol:
Toxicity signs in ascending order:
Antidote: 10% calcium gluconate, 10 mL IV over 3 minutes. This sequence (therapeutic range, toxicity signs, antidote) appears in NEET PG almost every year.
Definitive treatment of preeclampsia is delivery. The decision depends on gestational age and severity. Severe preeclampsia at >=34 weeks: deliver after stabilization. Mild preeclampsia: can be managed expectantly until 37 weeks.
GDM is glucose intolerance first recognized during pregnancy. India has a high prevalence (10-15% of pregnancies) due to genetic predisposition and changing dietary patterns.
DIPSI (Diabetes in Pregnancy Study Group India) criteria: a single non-fasting 75 g oral glucose load with 2-hour plasma glucose >=140 mg/dL diagnoses GDM. This is the recommended screening method in India — simpler than the IADPSG criteria used internationally.
Maternal complications: preeclampsia, polyhydramnios, recurrent infections, future type 2 diabetes (50% risk within 20 years)
Fetal complications: macrosomia (>4 kg), shoulder dystocia, neonatal hypoglycemia (most common neonatal complication — hyperinsulinemia persists after cord clamping), polycythemia, hyperbilirubinemia
Management: medical nutrition therapy (first-line), insulin if targets not met (metformin is increasingly used but insulin remains the standard for NEET PG answers). Target: fasting <95 mg/dL, 2-hour postprandial <120 mg/dL.
Rh isoimmunization occurs when an Rh-negative mother carries an Rh-positive fetus. Fetal RBCs enter the maternal circulation (fetomaternal hemorrhage), stimulating maternal anti-D IgG antibodies that cross the placenta in subsequent pregnancies and cause hemolytic disease of the fetus and newborn (HDFN).
Test yourself on obstetrics-gynecology — practice 10 free MCQs with AI explanations.
Start Free Practice →Antepartum hemorrhage (APH) is vaginal bleeding after 28 weeks of gestation (some define after 20 weeks). The two major causes — placenta previa and placental abruption — account for >50% of cases and are tested as a differential diagnosis pair in almost every NEET PG paper.
| Feature | Placenta Previa | Placental Abruption |
|---|---|---|
| Bleeding | Painless, bright red, recurrent | Painful, dark, may be concealed |
| Uterus | Soft, non-tender, relaxed | Tense, tender, board-like (Couvelaire uterus in severe cases) |
| Fetal distress | Usually absent (unless massive) | Early and prominent |
| Shock | Proportional to visible bleeding | Disproportionate to visible bleeding (concealed hemorrhage) |
| Coagulopathy | Rare | DIC in severe cases (20%) |
| Diagnosis | Ultrasound (placenta covers internal os) | Clinical diagnosis; ultrasound may miss retroplacental clot |
| Risk factors | Previous cesarean section, multiparity, multiple pregnancy | Hypertension (most common), smoking, cocaine, abdominal trauma |
| Management | No per vaginal exam until previa excluded; cesarean section for major previa | Immediate delivery if fetal distress or severe abruption; vaginal if mild with stable fetus |
Classification of placenta previa (updated):
The old four-type classification (type I-IV) is being replaced, but NBE may still test it:
The cardinal rule: Never perform a per vaginal examination in a patient with APH until placenta previa has been excluded by ultrasound. A vaginal exam can trigger catastrophic hemorrhage if the examining finger disturbs a previa. This is the single most important management principle and a favorite NEET PG question.
Postpartum hemorrhage (PPH) is blood loss of >=500 mL after vaginal delivery or >=1000 mL after cesarean section. It is the leading cause of maternal mortality worldwide (WHO 2023) and in India (contributing to 27% of maternal deaths, SRS 2020).
| Cause | Frequency | Mechanism | Key Feature |
|---|---|---|---|
| Tone (uterine atony) | 70% | Failure of uterine contraction after delivery | Boggy, enlarged uterus; continuous bleeding |
| Tissue (retained products) | 20% | Retained placenta or placental fragments | Incomplete placenta on inspection |
| Trauma | 9% | Cervical/vaginal/perineal lacerations, uterine rupture | Bleeding despite well-contracted uterus |
| Thrombin (coagulopathy) | 1% | DIC, von Willebrand disease, anticoagulant therapy | Generalized oozing, failure to clot |
The stepwise approach to uterine atony is a favorite MCQ sequence:
Active management of the third stage of labor (AMTSL) prevents PPH: oxytocin 10 IU IM within 1 minute of delivery, controlled cord traction, and uterine massage. AMTSL reduces PPH risk by 60% (WHO recommendation).
Contraception contributes 3-4 questions per NEET PG paper. NBE tests mechanism of action, failure rates (Pearl Index), contraindications, and non-contraceptive benefits. Comparison tables are the most efficient way to learn this topic.
| Method | Pearl Index (failures per 100 woman-years) | Mechanism | Key Fact |
|---|---|---|---|
| Combined OCP | 0.3 (perfect use) | Suppresses ovulation (LH surge inhibition), thickens cervical mucus | Contraindicated: smokers >35, migraine with aura, history of VTE, breast cancer |
| POP (mini-pill) | 0.5 | Thickens cervical mucus; ovulation variably suppressed | Safe in lactation; taken at the same time daily |
| Cu-T 380A (IUCD) | 0.6 | Spermicidal (copper ions), endometrial inflammatory reaction prevents implantation | Effective for 10 years; can be used for emergency contraception up to 5 days |
| LNG-IUS (Mirena) | 0.2 | Endometrial atrophy, thickens cervical mucus | Effective for 5 years; reduces menorrhagia; DOC for HMB + contraception |
| DMPA (Depo-Provera) | 0.3 | Suppresses ovulation | IM every 3 months; delayed return to fertility (up to 18 months); weight gain |
| Male condom | 2 (perfect), 13 (typical) | Barrier | Only method providing STI protection |
| Female sterilization | 0.5 | Tubal occlusion | Permanent; most popular method in India (NFHS-5: 36% of married women) |
| Vasectomy | 0.1 | Vas deferens occlusion | Most effective long-term method; confirmation by semen analysis at 3 months |
Mifepristone (RU-486) is used for medical termination of pregnancy, not emergency contraception (a common NEET PG trap). It is an antiprogestogen that blocks progesterone receptors, causing decidual necrosis and detachment. Used with misoprostol for MTP up to 9 weeks (MTP Act 2021, India).
Gynecological cancers contribute 3-5 questions per NEET PG. Cervical cancer screening and staging dominate, followed by ovarian tumor classification. NBE tests the screening-to-diagnosis pathway and the clinical features that indicate the tumor type.
Cervical cancer is the second most common cancer in Indian women (after breast cancer) with an estimated 123,907 new cases in 2022 (Globocan 2022 data). HPV types 16 and 18 cause approximately 70% of cases.
Screening methods:
Screening-to-treatment pathway: Abnormal screening result, then colposcopy with directed biopsy, then histological diagnosis, then treatment. This sequence is the most commonly tested pathway.
FIGO staging (2018): cervical cancer is clinically staged (not surgically). Key stages:
Treatment by stage:
Ovarian tumors are classified by cell of origin:
| Category | Tumor | Key Feature | Tumor Marker |
|---|---|---|---|
| Epithelial (65-70%) | Serous cystadenocarcinoma | Most common malignant ovarian tumor | CA-125 |
| Mucinous cystadenoma | Pseudomyxoma peritonei if ruptured | CA-125, CEA | |
| Brenner tumor | Coffee bean nuclei (Walthard nests) | — | |
| Germ cell (15-20%) | Mature teratoma (dermoid cyst) | Most common benign ovarian tumor in young women; contains teeth, hair, sebum | AFP, beta-hCG |
| Dysgerminoma | Female equivalent of seminoma; most common malignant germ cell tumor | LDH | |
| Endodermal sinus (yolk sac) tumor | Schiller-Duval bodies | AFP | |
| Choriocarcinoma | Very high beta-hCG | Beta-hCG | |
| Sex cord-stromal (5-8%) | Granulosa cell tumor | Call-Exner bodies; precocious puberty in children, abnormal uterine bleeding in adults | Inhibin |
| Sertoli-Leydig cell tumor (arrhenoblastoma) | Virilization | Testosterone | |
| Fibroma | Meigs syndrome (fibroma + ascites + pleural effusion) | — |
Krukenberg tumor is a metastatic ovarian tumor (most commonly from gastric cancer) characterized by signet ring cells. Bilateral ovarian enlargement in a patient with GI symptoms should raise suspicion.
Polycystic ovarian syndrome is the most common endocrine disorder in women of reproductive age, affecting 5-15% of Indian women. NBE tests the diagnostic criteria, hormonal profile, and management.
Diagnosis requires 2 of 3:
| Parameter | Finding in PCOS | Clinical Significance |
|---|---|---|
| LH | Elevated | LH:FSH ratio >2:1 (classic finding) |
| FSH | Normal or low | — |
| Testosterone | Elevated (free testosterone more sensitive) | Causes hirsutism, acne |
| DHEAS | Mildly elevated | Adrenal androgen |
| Insulin | Elevated (hyperinsulinemia) | Drives androgen production; associated with metabolic syndrome |
| SHBG | Low | Increases free testosterone availability |
Infertility is defined as failure to conceive after 12 months of regular unprotected intercourse (6 months if female partner is >35 years). It affects approximately 10-15% of couples in India.
The workup evaluates four factors: ovulation, tubal patency, uterine cavity, and male factor (semen analysis).
Ovulation assessment:
Tubal patency:
Semen analysis (WHO 2021 criteria):
| Parameter | Normal Value |
|---|---|
| Volume | >=1.4 mL |
| Sperm concentration | >=16 million/mL |
| Total sperm count | >=39 million per ejaculate |
| Motility (progressive) | >=30% |
| Total motility | >=42% |
| Morphology (strict Kruger) | >=4% normal forms |
Semen analysis is performed after 2-7 days of abstinence. Abnormal results require confirmation with a repeat sample after 3 months (one spermatogenesis cycle is approximately 74 days). Male factor contributes to infertility in 30-40% of couples.
Assisted reproduction indications:
Cross-reference with Medicine high-yield topics for endocrine overlap (thyroid disorders in pregnancy, GDM) and with Surgery high-yield topics for surgical management of ectopic pregnancy and ovarian torsion.
OBG rewards clinical-scenario-based learning. Every topic in this guide translates directly into a clinical vignette in the exam. Build your preparation around case-based MCQ practice rather than textbook reading alone.
Cover the eight areas using DC Dutta's Textbook of Obstetrics (10th edition) and DC Dutta's Textbook of Gynecology (8th edition). Build comparison tables on day 1: previa versus abruption, nephrotic versus nephritic (cross-reference with pediatrics), and contraception methods with failure rates. Solve 15 OBG MCQs daily.
Increase to 25 MCQs daily with mixed obstetric and gynecology topics. For each wrong answer, classify:
Use spaced repetition for NEET PG to drill the MgSO4 regimen, FIGO staging, and contraception comparison tables.
Revise four tables daily: stages of labor, APH differentiation, PPH management, and contraception comparison. Solve one full-length OBG mock under timed conditions. On exam day, review the MgSO4 Pritchard regimen and partograph rules — these are almost guaranteed marks.
Obstetrics and Gynecology contributes 20-25 questions in NEET PG (2021-2024 analysis). Obstetrics accounts for approximately 12-15 questions and gynecology 8-10. Normal labor, preeclampsia/eclampsia, APH, PPH, and contraception are the top five most tested topics. Gynecological cancers, especially cervical screening, appear with annual regularity.
Normal labor stages and partograph interpretation top the list. Preeclampsia management (magnesium sulfate regimen), placenta previa versus abruption differentiation, postpartum hemorrhage causes (the 4 Ts), and contraception methods with failure rates are the next tier. In gynecology, cervical cancer screening (Pap smear, VIA, HPV DNA), ovarian tumor classification, and PCOD diagnostic criteria are the most tested.
Use DC Dutta's Textbook of Obstetrics as your primary text — it is concise, exam-oriented, and covers Indian clinical practice. Williams Obstetrics is the gold-standard reference but is too detailed for time-efficient NEET PG preparation. Use Williams selectively for topics where mechanism-level understanding is needed — preeclampsia pathophysiology, Rh isoimmunization, and fetal physiology.
The key discriminators are: placenta previa presents with painless, bright red vaginal bleeding; abruption presents with painful, dark bleeding with a tense tender uterus. In previa the uterus is soft and non-tender; in abruption the uterus is hard (Couvelaire uterus in severe cases). Previa is diagnosed by ultrasound (never do per vaginal exam until previa is excluded). Abruption is a clinical diagnosis.
Magnesium sulfate is the drug of choice for both prevention (in severe preeclampsia) and treatment of eclampsia. Know the Pritchard regimen: loading dose 4g IV + 5g IM in each buttock, then 5g IM every 4 hours. Therapeutic range is 4-7 mEq/L. Toxicity signs: loss of patellar reflex (first), respiratory depression, cardiac arrest. Antidote is calcium gluconate.
The 4 Ts are: Tone (uterine atony, 70%, most common), Tissue (retained products, 20%), Trauma (lacerations, 9%), and Thrombin (coagulopathy, 1%). Uterine atony is managed by bimanual compression, oxytocin, ergometrine, and carboprost. The stepwise approach from drugs to tamponade to surgery is a favorite MCQ sequence.
The Rotterdam criteria (2003) require 2 of 3: oligo/anovulation, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology on ultrasound (12 or more follicles of 2-9 mm or ovarian volume >10 mL). The LH:FSH ratio is elevated (>2:1). NBE tests the criteria, hormonal profile, and the association with insulin resistance.
In the final two weeks, revise four tables daily: stages of labor with cardinal movements, preeclampsia versus eclampsia management, APH differentiation (previa versus abruption), and contraception comparison with failure rates. Solve 20-25 OBG MCQs daily under timed conditions. On exam day, review the partograph interpretation rules and the MgSO4 regimen.
Start your OBG prep today. Open the Obstetrics and Gynecology subject page and solve your first 15 MCQs — the clinical scenarios you practice now are the marks you will collect on exam day. Want unlimited AI-powered OBG MCQs with detailed explanations? Explore NEETPGAI Pro.
Looking for a structured study timeline? Build your personalized NEET PG study plan that integrates OBG with your other subjects.
Written by: NEETPGAI Editorial Team Reviewed by: Pending SME Review Last reviewed: April 2026
This article is reviewed by qualified medical professionals for clinical accuracy and exam relevance. For corrections or updates, contact the editorial team.
This content is for educational purposes for NEET PG exam preparation. It is not a substitute for professional medical advice, diagnosis, or treatment. Clinical information has been reviewed by qualified medical professionals.