UNITY MEDICAL ACADEMY
Complete Obstetrics – NORCET High-Yield Notes
Detailed Explanation + Clinical Correlation + High-Yield Points + MCQ Practice Test
📚 Obstetrics – Complete Topic Index
- Obstetric Score
- Calculation of EDD
- Antenatal Care
- Anemia in Pregnancy
- Anemia Mukt Bharat Program
- Abortion
- Medical Termination of Pregnancy – MTP
- Ectopic Pregnancy – Management
- Hydatidiform Mole – Snowstorm Appearance & Management
- Chorionic Villus Sampling
- Amniocentesis
- Cord Prolapse
- Shoulder Dystocia – Management
- Postpartum Hemorrhage – Risk Factors & Management
- Active Management of Third Stage of Labour
- Partograph & Labour Care Guide
- Antepartum Hemorrhage – Placenta Previa & Abruptio Placentae
- Placenta Accreta Spectrum
- Breech Presentation & Maneuvers
- Leopold Maneuvers
- Fetal Skull Diameters
- Instruments Used in Curettage & Cesarean Section
- Episiotomy
- Diabetes in Pregnancy
- Pregnancy-Induced Hypertension / Hypertensive Disorders
- Anti-D Immunoglobulin – Dose & Indications
- Twins – Types, Superfecundation & Superfetation
Definition
Obstetric scoring is a systematic method of recording a woman's pregnancy history. It helps the healthcare team quickly understand previous pregnancies, births, abortions and living children.
GTPAL System
| Letter | Meaning | Explanation |
|---|---|---|
| G | Gravida | Total number of pregnancies, including the current pregnancy. |
| T | Term births | Number of pregnancies reaching term gestation. |
| P | Preterm births | Births occurring after the threshold for viability but before term. |
| A | Abortions | Pregnancies ending before the specified gestational threshold. |
| L | Living children | Total number of currently living children. |
Example
A woman is currently pregnant. She previously had two term births, one preterm birth and one abortion. All three children from the births are alive.
Her GTPAL is: G5 T2 P1 A1 L3
Naegele's Rule
EDD is traditionally estimated from the first day of the last menstrual period (LMP).
EDD = LMP + 7 days − 3 months + 1 year
Example
If LMP = 10 January 2026:
- Add 7 days → 17 January
- Subtract 3 months → 17 October
- Add 1 year → 17 October 2026
Estimated date of delivery = 17 October 2026.
Gestational Age
Pregnancy is commonly described as approximately 40 weeks from the first day of the LMP.
Definition
Antenatal care is the systematic care provided to a pregnant woman from conception until the onset of labour to promote maternal and fetal health and identify complications early.
Objectives
- Confirm and appropriately date pregnancy.
- Assess maternal and fetal wellbeing.
- Identify high-risk pregnancy.
- Detect anemia, hypertension, diabetes and infections.
- Provide nutritional and lifestyle counselling.
- Administer recommended vaccines and supplements.
- Prepare the woman and family for birth and emergencies.
- Provide counselling regarding breastfeeding and postpartum care.
Important Components
- History taking.
- General and obstetric examination.
- Blood pressure measurement.
- Weight monitoring.
- Urine testing when indicated.
- Hemoglobin assessment.
- Blood group and Rh typing.
- Screening for relevant infections.
- Blood glucose assessment.
- Ultrasound according to clinical need and local protocols.
- Fetal growth and wellbeing assessment.
Danger Signs
- Vaginal bleeding.
- Severe abdominal pain.
- Severe headache or visual disturbance.
- Convulsions.
- Breathing difficulty.
- Leakage of fluid per vagina.
- Marked reduction in fetal movements.
- High fever or severe systemic illness.
Definition
Anemia in pregnancy refers to hemoglobin concentration below the pregnancy-specific threshold used by the applicable clinical guideline.
Common Causes
- Iron deficiency – common nutritional cause.
- Folate deficiency.
- Vitamin B12 deficiency.
- Hemoglobinopathies.
- Chronic disease.
- Blood loss.
- Parasitic infection in endemic settings.
Clinical Features
- Fatigue
- Weakness
- Pallor
- Dyspnea on exertion
- Palpitations
- Dizziness
- Headache
Maternal Effects
- Reduced exercise tolerance.
- Increased susceptibility to complications when severe.
- Reduced tolerance of blood loss during delivery.
- Increased risk of adverse pregnancy outcomes when significant.
Management Principles
- Determine severity and likely cause.
- Assess dietary intake and adherence to supplementation.
- Provide iron and folate according to national guidance.
- Investigate severe, persistent or atypical anemia.
- Consider parenteral iron when clinically indicated.
- Manage the underlying cause.
Concept
Anemia Mukt Bharat (AMB) is India's public-health strategy aimed at reducing anemia through a life-course approach involving iron-folic acid supplementation, screening, treatment, behaviour change, deworming and other interventions.
Key Components
- Iron-folic acid supplementation.
- Anemia screening and appropriate treatment.
- Deworming as recommended.
- Dietary diversification.
- Behaviour change communication.
- Addressing non-nutritional causes where relevant.
- Strengthening implementation and monitoring.
Definition
Abortion refers to loss or termination of pregnancy before fetal viability. The exact legal and clinical definitions vary by jurisdiction and guideline.
Types
- Threatened abortion
- Inevitable abortion
- Incomplete abortion
- Complete abortion
- Missed abortion
- Septic abortion
- Recurrent pregnancy loss
Threatened Abortion
Typical presentation includes vaginal bleeding with a closed cervical os and no passage of products of conception.
Incomplete Abortion
Some products of conception remain within the uterus, often with bleeding and an open cervical os.
Missed Abortion
The pregnancy has stopped developing, but the products of conception remain in the uterus.
Septic Abortion
Pregnancy loss complicated by infection. It is an obstetric emergency requiring prompt treatment.
Concept
Medical termination of pregnancy involves intentional termination of pregnancy using medical or surgical methods within the legal and clinical framework applicable in the country.
Methods
| Method | General Concept |
|---|---|
| Medical abortion | Use of medications to induce expulsion of pregnancy tissue. |
| Vacuum aspiration | Uterine evacuation using suction. |
| Dilatation and evacuation | Cervical preparation followed by evacuation when indicated. |
Nursing Responsibilities
- Confirm clinical assessment and gestational age.
- Assess blood group/Rh status when indicated.
- Explain procedure and expected symptoms.
- Maintain privacy and confidentiality.
- Monitor bleeding and vital signs.
- Identify infection or incomplete evacuation.
- Provide contraception counselling where desired.
- Give clear follow-up and emergency instructions.
Definition
An ectopic pregnancy occurs when implantation occurs outside the normal endometrial cavity, most commonly within the fallopian tube.
Risk Factors
- Previous ectopic pregnancy.
- Pelvic inflammatory disease.
- Tubal surgery.
- Assisted reproductive technology.
- Previous pelvic/tubal pathology.
- Smoking is an associated risk factor.
Clinical Features
- Amenorrhea
- Lower abdominal or pelvic pain
- Vaginal bleeding
- Shoulder-tip pain may occur with intraperitoneal bleeding.
- Syncope or shock may occur after rupture.
Management
Expectant Management
May be appropriate in carefully selected stable patients with appropriate biochemical and ultrasound findings and reliable follow-up.
Medical Management
Methotrexate may be used in selected patients meeting established criteria and without contraindications.
Surgical Management
Surgery is indicated in situations such as rupture, significant hemorrhage, hemodynamic instability or when medical management is not appropriate.
Definition
Hydatidiform mole is a form of gestational trophoblastic disease characterized by abnormal proliferation of trophoblastic tissue and abnormal chorionic villi.
Types
- Complete mole
- Partial mole
Clinical Features
- Vaginal bleeding
- Uterus larger than expected in some cases
- Very high β-hCG levels
- Hyperemesis
- Early-onset hypertensive disease
- Passage of vesicular tissue
Snowstorm Appearance
Ultrasound may demonstrate a characteristic heterogeneous, multicystic appearance often described as a snowstorm or cluster-of-grapes appearance, particularly with a complete mole.
Management
- Stabilize the patient if bleeding or other complications exist.
- Confirm diagnosis using appropriate clinical and ultrasound assessment.
- Evacuate the uterine contents using an appropriate method.
- Send tissue for histopathological examination.
- Monitor β-hCG after evacuation.
- Ensure appropriate follow-up to detect persistent gestational trophoblastic disease.
- Provide contraception advice during the surveillance period according to clinical guidance.
Definition
CVS is an invasive prenatal diagnostic procedure in which a sample of placental chorionic villi is obtained for genetic or chromosomal testing.
Routes
- Transcervical
- Transabdominal
Uses
- Diagnosis of chromosomal abnormalities.
- Diagnosis of selected genetic disorders.
- Testing when a specific inherited disorder is suspected.
Advantages
CVS can provide genetic information earlier in pregnancy than amniocentesis.
Important Point
CVS does not directly provide amniotic-fluid testing and is not the same procedure as amniocentesis.
Definition
Amniocentesis is an invasive procedure in which amniotic fluid is obtained through a needle inserted into the amniotic cavity under ultrasound guidance.
Uses
- Chromosomal/genetic diagnosis.
- Selected fetal infection investigations.
- Other specialized testing depending on clinical indication.
Complications
- Bleeding
- Infection
- Fluid leakage
- Pregnancy loss
- Rare fetal injury
Nursing Care
- Explain the procedure.
- Check relevant investigations and consent.
- Assist with ultrasound-guided procedure.
- Monitor maternal vital signs.
- Observe for bleeding, fluid leakage, pain or fever.
- Follow Rh-immunoglobulin guidance for Rh-negative patients when indicated.
CVS → chorionic villi / placental tissue.
Amniocentesis → amniotic fluid.
Definition
Cord prolapse occurs when the umbilical cord descends through the cervix alongside or past the presenting part after rupture of the membranes.
Risk Factors
- Malpresentation
- Prematurity
- Multiple pregnancy
- Polyhydramnios
- High presenting part
- Artificial rupture of membranes with an unengaged presenting part
Clinical Sign
Sudden fetal heart rate abnormalities after rupture of membranes should raise suspicion for cord compression/prolapse.
Immediate Management Principles
- Call for urgent obstetric assistance.
- Relieve pressure on the cord by elevating the presenting part.
- Position the mother to reduce cord compression, such as knee-chest or an appropriate pelvic-elevating position.
- Avoid unnecessary handling of the exposed cord.
- Prepare for urgent delivery when indicated.
- Continuously assess fetal status.
Definition
Shoulder dystocia occurs when, after delivery of the fetal head, the shoulders fail to deliver with routine gentle traction.
Risk Factors
- Previous shoulder dystocia
- Maternal diabetes
- Fetal macrosomia
- Maternal obesity
- Prolonged or abnormal labour
Classic Sign
The turtle sign refers to retraction of the fetal head against the maternal perineum after delivery.
Management – HELPERR Concept
- H – Help: Call for assistance.
- E – Evaluate episiotomy: Consider episiotomy to facilitate internal maneuvers when appropriate.
- L – Legs: McRoberts maneuver.
- P – Pressure: Suprapubic pressure.
- E – Enter maneuvers: Internal rotational maneuvers.
- R – Remove posterior arm: Deliver the posterior arm when appropriate.
- R – Roll: All-fours position may be used.
Definition
Postpartum hemorrhage is significant postpartum blood loss with potential maternal compromise. Modern definitions emphasize clinical significance rather than relying solely on an estimated blood-loss number.
Four Ts
| Cause | Meaning |
|---|---|
| Tone | Uterine atony |
| Trauma | Genital tract laceration, hematoma, uterine rupture or inversion |
| Tissue | Retained placenta/products |
| Thrombin | Coagulation disorders |
Risk Factors
- Previous PPH
- Uterine overdistension
- Prolonged labour
- Rapid labour
- Multiple pregnancy
- Macrosomia
- Placental abnormalities
- Operative delivery
- Coagulopathy
Management Principles
- Recognize and quantify blood loss promptly.
- Call for help.
- Assess airway, breathing and circulation.
- Establish IV access.
- Begin fluid/blood-product resuscitation as clinically indicated.
- Assess uterine tone.
- Perform uterine massage when atony is suspected.
- Administer appropriate uterotonic therapy.
- Identify retained tissue or genital tract trauma.
- Escalate to procedures or surgery if bleeding persists.
Purpose
Active management of the third stage of labour aims to reduce postpartum hemorrhage, particularly hemorrhage related to uterine atony.
Key Components
- Administration of a prophylactic uterotonic, preferably oxytocin, according to current recommendations.
- Controlled cord traction by a trained provider when appropriate.
- Assessment of uterine tone after placental delivery.
Placental Separation Signs
- Sudden gush of blood
- Lengthening of the umbilical cord
- Uterus becomes firm and globular
- Uterus rises in the abdomen
Partograph
A partograph is a graphical tool historically used to monitor progress of labour and maternal and fetal condition.
Parameters
- Cervical dilatation
- Descent of presenting part
- Fetal heart rate
- Contractions
- Maternal pulse
- Blood pressure
- Temperature
- Urine output and relevant findings
Labour Care Guide
The WHO Labour Care Guide is designed as a broader, woman-centred tool for monitoring labour and supporting respectful care and clinical decision-making.
Antepartum Hemorrhage
Antepartum hemorrhage refers to bleeding from the genital tract during the latter part of pregnancy before birth.
Placenta Previa
Placenta previa occurs when the placenta implants in the lower uterine segment and may cover or approach the internal cervical os.
Typical Features
- Painless vaginal bleeding
- Often bright-red bleeding
- Uterus may remain soft and non-tender
Abruptio Placentae
Placental abruption is premature separation of a normally implanted placenta before delivery.
Typical Features
- Abdominal pain
- Uterine tenderness
- Uterine hypertonicity may occur
- Vaginal bleeding may be visible or concealed
- Fetal distress or fetal death may occur
| Feature | Placenta Previa | Abruptio Placentae |
|---|---|---|
| Bleeding | Usually painless | Usually painful |
| Uterus | Usually soft | Often tender/tense |
| Blood | Often visible | May be concealed |
| Fetal distress | May occur depending on bleeding | More likely in significant abruption |
Definition
Placenta accreta spectrum describes abnormal adherence and/or invasion of placental tissue into the uterine wall.
Types
| Type | Basic Description |
|---|---|
| Accreta | Placental villi abnormally adhere to the myometrium. |
| Increta | Placental villi invade into the myometrium. |
| Percreta | Placental villi penetrate through the uterine serosa and may involve adjacent organs. |
Major Risk Factors
- Previous cesarean delivery
- Placenta previa over a uterine scar
- Previous uterine surgery
- Prior curettage and other endometrial injury
Major Complication
Severe obstetric hemorrhage, particularly when attempts are made to remove an abnormally invasive placenta.
Definition
Breech presentation occurs when the fetal buttocks or lower limbs present at the pelvic inlet instead of the head.
Types
- Frank breech
- Complete breech
- Incomplete / footling breech
Important Maneuvers
Pinard Maneuver
Used to assist delivery of extended fetal legs during appropriate breech delivery.
Lovset Maneuver
Used for delivery of the fetal arms when they are extended or nuchal.
Mauriceau-Smellie-Veit Maneuver
Used to assist delivery of the after-coming head in selected breech deliveries.
Purpose
Leopold maneuvers are four systematic abdominal palpation maneuvers used to assess fetal lie, presentation, position and engagement.
Four Maneuvers
-
First Maneuver – Fundal Grip
Determines which fetal pole occupies the fundus. -
Second Maneuver – Lateral Grip
Identifies the fetal back and small parts. -
Third Maneuver – Pawlik's Grip
Identifies the presenting part above the pelvic inlet. -
Fourth Maneuver – Pelvic Grip
Assesses descent and flexion of the presenting part.
Important Anteroposterior Diameters
| Diameter | Approximate Length | Clinical Significance |
|---|---|---|
| Suboccipitobregmatic | ≈ 9.5 cm | Flexed vertex presentation |
| Suboccipitofrontal | ≈ 10 cm | Intermediate flexion/extension relationship |
| Occipitofrontal | ≈ 11.5 cm | Less flexed head |
| Mentovertical | ≈ 13.5 cm | Markedly extended head; important in brow presentation |
| Submentobregmatic | ≈ 9.5 cm | Face presentation with complete extension |
Important Transverse Diameter
Biparietal diameter is approximately 9.5 cm and is an important transverse diameter of the fetal skull.
Curettage Instruments
- Uterine sound
- Vulsellum
- Tenaculum
- Cervical dilators
- Curette
- Suction cannula
Cesarean Section Instruments
- Scalpel
- Artery forceps
- Allis forceps
- Kocher forceps
- Retractors
- Needle holders
- Scissors
- Delivery forceps when required
Definition
Episiotomy is a surgical incision of the perineum performed during the second stage of labour when clinically indicated.
Types
- Midline / median
- Mediolateral
- Lateral
Mediolateral Episiotomy
The incision begins at the vaginal opening and extends laterally away from the midline.
Indications
Routine episiotomy is not recommended. It may be considered when clinically indicated, for example in selected instrumental births or situations requiring expedited birth.
Complications
- Pain
- Bleeding
- Infection
- Wound breakdown
- Dyspareunia
- Extension into higher-degree perineal tears
Types
- Pre-existing type 1 diabetes
- Pre-existing type 2 diabetes
- Gestational diabetes mellitus (GDM)
Maternal Complications
- Hypertensive disorders
- Cesarean delivery
- Infections
- Worsening of pre-existing vascular complications
Fetal/Neonatal Complications
- Macrosomia
- Birth trauma
- Neonatal hypoglycemia
- Respiratory problems
- Stillbirth risk in poorly controlled diabetes
Management Principles
- Dietary counselling.
- Appropriate physical activity when safe.
- Blood glucose monitoring.
- Medication when lifestyle measures are insufficient.
- Maternal and fetal surveillance.
- Individualized planning of timing and mode of delivery.
Major Categories
- Chronic hypertension
- Gestational hypertension
- Preeclampsia
- Preeclampsia with severe features
- Eclampsia
- Chronic hypertension with superimposed preeclampsia
Gestational Hypertension
Hypertension developing after 20 weeks of pregnancy without evidence of preeclampsia.
Preeclampsia
A pregnancy-specific hypertensive disorder characterized by new hypertension after 20 weeks with proteinuria and/or maternal organ dysfunction according to accepted diagnostic criteria.
Severe Features
May include:- Severe-range blood pressure
- Thrombocytopenia
- Renal dysfunction
- Impaired liver function
- Pulmonary edema
- Persistent severe headache or visual symptoms
Eclampsia
Eclampsia is the occurrence of seizures in a patient with a hypertensive disorder of pregnancy that cannot be explained by another cause.
Magnesium Sulfate
Magnesium sulfate is the standard anticonvulsant used for prevention and treatment of eclamptic seizures.
Monitoring During Magnesium Therapy
- Respiratory rate
- Deep tendon reflexes
- Urine output
- Level of consciousness
- Clinical signs of toxicity
Purpose
Anti-D immunoglobulin is given to unsensitized RhD-negative women to reduce the risk of RhD alloimmunization following exposure to RhD-positive fetal red cells.
When May It Be Required?
- Routine antenatal prophylaxis according to local protocol.
- After delivery when the newborn is RhD-positive or status is otherwise relevant according to protocol.
- After potentially sensitizing events such as bleeding, miscarriage, abortion, ectopic pregnancy, invasive procedures, abdominal trauma or other fetomaternal hemorrhage.
Important Principle
Anti-D prevents sensitization; it does not reverse established RhD alloimmunization.
Types of Twins
Dizygotic Twins
Two ova are fertilized by two separate sperm. They are genetically similar to ordinary siblings and may be of the same or different sex.
Monozygotic Twins
One fertilized ovum divides into two embryos. The timing of division influences chorionicity and amnionicity.
Superfecundation
Superfecundation refers to fertilization of two or more ova released during the same menstrual cycle by sperm from separate episodes of intercourse.
Heteropaternal superfecundation can occur when the ova are fertilized by sperm from different men.
Superfetation
Superfetation refers to conception occurring after a pregnancy has already been established, resulting in fetuses of different developmental ages. It is extremely rare in humans.
| Concept | Meaning |
|---|---|
| Monozygotic | One zygote → division → two embryos |
| Dizygotic | Two ova + two sperm |
| Superfecundation | Multiple ova fertilized during the same cycle |
| Superfetation | New conception after pregnancy has already begun |
- GTPAL: Gravida = total pregnancies.
- EDD: Naegele's rule is based on LMP.
- Placenta previa: Classically painless bleeding.
- Abruptio placentae: Classically painful bleeding with uterine tenderness.
- PPH: Think 4 Ts – Tone, Trauma, Tissue, Thrombin.
- Shoulder dystocia: McRoberts + suprapubic pressure are key initial maneuvers.
- Cord prolapse: Relieve cord compression and arrange urgent delivery.
- Molar pregnancy: Snowstorm/multicystic ultrasound appearance and markedly elevated β-hCG.
- CVS: Chorionic villi.
- Amniocentesis: Amniotic fluid.
- Leopold: Four abdominal palpation maneuvers.
- Pinard: Breech legs.
- Lovset: Breech arms.
- Mauriceau-Smellie-Veit: After-coming head.
- Accreta: Abnormal placental adherence.
- Increta: Myometrial invasion.
- Percreta: Through uterine serosa ± adjacent organs.
- Anti-D: Prevents RhD sensitization in eligible unsensitized RhD-negative women.
- Eclampsia: Seizure associated with hypertensive disorder of pregnancy.
- Magnesium sulfate: Anticonvulsant of choice for eclamptic seizures.
📝 Obstetrics NORCET MCQ Practice Test
30 Clinical + Concept-Based Questions
1 Question at a Time | 30 Marks | 30 Minutes