D313 OB Maternity: Comprehensive Overview of Pregnancy & Labor

Grace J.
November 12, 2025November 12, 2025
BSN, D313, Western Governors University

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Western Governors University

D313 Anatomy and Physiology II with Lab

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Date

Prenatal Terms and Abbreviations

Pregnancy-related terminology is vital for effective and precise communication in obstetrics and maternal healthcare. Understanding these terms ensures accuracy in patient assessment, documentation, and interdisciplinary collaboration. The following sections redefine essential prenatal terms and their clinical implications.

Preterm, Term, and Postterm Pregnancies

A pregnancy is categorized based on gestational duration, measured from the first day of the last menstrual period (LMP). These classifications assist healthcare professionals in identifying potential risks and planning appropriate interventions.

Term	Definition	Gestational Range
Preterm	Pregnancy reaching at least 20 weeks but ending before 37 completed weeks.	20–36 weeks 6/7 days
Early Term	Births that occur slightly before the standard full-term range.	37 weeks to 38 weeks 6/7 days
Full Term	Pregnancy lasting the expected duration.	39 weeks to 40 weeks 6/7 days
Late Term	Pregnancy that continues slightly beyond the expected full term.	41 weeks to 41 weeks 6/7 days
Postterm (Postdate)	Pregnancy that extends beyond 42 completed weeks.	≥42 weeks

Common Abbreviations in Prenatal Care

Healthcare professionals frequently use abbreviations in clinical documentation to streamline communication. The table below outlines commonly used obstetric abbreviations and their meanings.

Abbreviation	Meaning
IUP / IUFD	Intrauterine Pregnancy / Intrauterine Fetal Demise
SAB	Spontaneous Abortion
TAB	Therapeutic Abortion
LMP	Last Menstrual Period
ROM	Rupture of Membranes
SROM / AROM	Spontaneous / Artificial Rupture of Membranes
PROM / PPROM	Prolonged (>24 hours) / Preterm Premature Rupture of Membranes
SVD	Spontaneous Vaginal Delivery
FHR / EFM	Fetal Heart Rate / Electronic Fetal Monitoring
US / FSE / IUPC	Ultrasound / Fetal Scalp Electrode / Intrauterine Pressure Catheter
LTV / SVE	Long-Term Variability / Sterile Vaginal Exam
MLE	Midline Episiotomy
NST / CST / BPP	Non-Stress Test / Contraction Stress Test / Biophysical Profile
VBAC	Vaginal Birth After Cesarean
AFI	Amniotic Fluid Index
BUFA / NPNC / LPNC	Baby Up for Adoption / No Prenatal Care / Late Prenatal Care
PTL / BOA	Preterm Labor / Born On Arrival
BTL	Bilateral Tubal Ligation
D&C / D&E	Dilation & Curettage / Dilation & Evacuation
TIUP	Term Intrauterine Pregnancy
VMI / VFI	Viable Male Infant / Viable Female Infant
EDB / EDC / EDD	Estimated Date of Birth / Confinement / Delivery

Obstetric Terminology: Gravidity, Parity, and Pregnancy Duration

What Do Gravida and Para Mean?

Gravida (G): Refers to the total number of pregnancies a woman has experienced, regardless of outcome. This includes the current pregnancy, miscarriages, and abortions. Multiple gestations (e.g., twins or triplets) are counted as one pregnancy.
Para (P): Indicates the number of pregnancies that have reached viability (20 weeks or more), regardless of whether the infant was born alive or stillborn.

Parity Term	Description	Number
Nullipara	No pregnancies beyond 20 weeks.	0
Primipara	One pregnancy reaching viability.	1
Multipara	Two or more pregnancies reaching viability.	2+

What Is GTPAL?

GTPAL is a system used to describe a woman’s reproductive history comprehensively. It summarizes gravidity, term, preterm, abortion, and living children counts.

Letter	Meaning	Notes
G	Gravidity: Total pregnancies (including current).	Multiples count as one.
T	Term births (>37 weeks).	Includes live or stillbirths.
P	Preterm births (20–36 6/7 weeks).	Includes live or stillbirths.
A	Abortions before 20 weeks.	Includes spontaneous and therapeutic.
L	Living children.	Multiples counted individually.

Pregnancy Duration and Fetal Age

Gestational age begins from the first day of the last normal menstrual period (LMP) and typically spans about 40 weeks. Fetal age, however, starts from conception and averages 38 weeks, approximately two weeks shorter.

Trimester	Duration (Weeks)
First	0–13
Second	14–26
Third	27–40

How to Use Naegele’s Rule for Estimating Delivery Date

Naegele’s Rule provides a simple method for estimating the Expected Date of Delivery (EDD) using the first day of the LMP.

Formula:

Subtract 3 months from the first day of the LMP.
Add 7 days.
Add 1 year.

Example:

Date Event	Date
Last Menstrual Period (LMP)	September 2, 2015
Minus 3 months	June 2, 2015
Add 7 days	June 9, 2015
Add 1 year	June 9, 2016

Practice Question 1

Scenario:
A patient gave birth on her due date two hours ago. She has a three-year-old daughter born a week past her due date and experienced a miscarriage at eight weeks last year.

What is her GTPAL?

Option	G	T	P	A	L
A	2	2	1	0	2
B	3	2	1	0	1
C	3	2	1	0	2
D	3	2	0	1	2

Correct Answer: D (3–2–0–1–2)

Practice Question 2

Scenario:
A woman with three previous pregnancies has had children born at 39 weeks, twins at 34 weeks, and one at 38 weeks. She is currently 38 weeks pregnant.

Option	G	T	P	L
A	4	1	3	4
B	4	1	2	3
C	4	2	1	4
D	4	2	2	4

Correct Answer: C (4–2–1–0–4)

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Pregnancy Signs and Symptoms

Recognizing the clinical signs and symptoms of pregnancy is vital for early detection and assessment. These signs are classified into three categories—presumptive, probable, and positive—based on their level of diagnostic certainty.

Presumptive (Subjective) Signs of Pregnancy

Presumptive signs are those experienced and reported by the woman herself. They are subjective and not conclusive, as they may result from other physiological or psychological conditions.

Common presumptive signs include:

Amenorrhea: The absence of menstruation due to hormonal changes, often one of the earliest indicators.
Fatigue and Tiredness: Increased metabolic demands can lead to early pregnancy fatigue.
Breast Changes: Enlargement, tenderness, and darkened areolae due to elevated estrogen and progesterone.
Increased Urination: Caused by pressure on the bladder and increased renal blood flow.
Quickening: The sensation of fetal movement, typically felt between 16 and 20 weeks of gestation.
Nausea and Vomiting: Commonly known as “morning sickness,” attributed to rising human chorionic gonadotropin (hCG) levels.

Why Is Quickening Not a Positive Sign?

Quickening can be misinterpreted as gastrointestinal activity such as gas or intestinal movement. Therefore, it cannot be considered a definitive indicator of pregnancy.

Probable (Objective) Signs of Pregnancy

Probable signs are observed by healthcare providers during clinical assessment. Although these signs are stronger indicators than presumptive ones, they are not absolute proof of pregnancy.

Common probable signs include:

Positive Pregnancy Test: Detection of hCG in blood or urine samples.
Ballottement: Fetal rebound felt when the cervix is gently tapped during a pelvic exam.
Braxton Hicks Contractions: Irregular, painless uterine contractions preparing the uterus for labor.
Goodell’s Sign: Softening of the cervix.
Chadwick’s Sign: Bluish discoloration of the cervix, vagina, and vulva.
Hegar’s Sign: Softening of the lower uterine segment.
Enlarged Uterus: Due to fetal growth and hormonal stimulation.

Why Is a Positive Pregnancy Test Not a Positive Sign?

Elevated hCG levels may occur in conditions such as trophoblastic disease or certain cancers, resulting in false-positive outcomes.

Positive (Definitive) Signs of Pregnancy

Positive signs are conclusive indicators confirming the presence of a living fetus. These findings are based on direct evidence of fetal activity or visualization.

Fetal Movement Felt by Examiner
Detection of Fetal Heart Sounds via stethoscope, Doppler, or electronic monitoring.
Ultrasound Visualization of Fetus
Birth of the Infant

These definitive findings confirm an intrauterine pregnancy beyond doubt.

What Should Be Avoided During Pregnancy?

To protect fetal development and maternal health, pregnant individuals should avoid exposure to certain harmful agents, substances, and infections.

Category	Examples	Potential Risks
Teratogenic Drugs	Thalidomide, valproic acid, phenytoin, retinoids, ACE inhibitors, lithium, warfarin	Fetal malformations, neurodevelopmental defects
Substances	Alcohol, tobacco, illicit drugs	Fetal alcohol syndrome, low birth weight, developmental delays
Infections (TORCH)	Toxoplasmosis, Parvovirus B19, Rubella, Cytomegalovirus, Herpes simplex	Congenital anomalies, miscarriage, preterm birth

Physiological Changes During Pregnancy

Pregnancy induces complex physiological adaptations across multiple organ systems to support fetal growth and maternal well-being.

System	Changes and Effects
Pituitary	Increased prolactin for lactation, oxytocin secretion for uterine contraction; suppression of FSH and LH.
Thyroid	Mild enlargement and elevated metabolism; increased appetite and heat intolerance.
Gastrointestinal	Progesterone causes smooth muscle relaxation leading to heartburn, constipation, and hemorrhoids.
Hematological	Plasma volume expands; relative hemodilution causes physiological anemia. Hypercoagulability increases DVT risk.
Renal	Glomerular filtration rate rises; increased frequency and nocturia due to uterine pressure.
Cardiovascular and Respiratory	Cardiac output rises by 30–50%; slight BP decrease; mild respiratory alkalosis due to increased oxygen demand.
Musculoskeletal	Lordosis, back pain, and leg cramps occur due to ligament relaxation and weight redistribution.
Integumentary (Skin)	Striae gravidarum, chloasma, linea nigra, and enlargement of Montgomery glands.

Hormones in Pregnancy

Several hormones play vital roles in maintaining pregnancy and preparing the body for labor and lactation.

Hormone	Primary Function
Prolactin	Stimulates milk production postpartum.
Estrogen	Promotes uterine growth and fetal organ development.
Progesterone	Relaxes smooth muscles and maintains uterine lining.
hCG (Human Chorionic Gonadotropin)	Maintains corpus luteum, preventing menstruation.
Oxytocin	Initiates uterine contractions during labor and milk ejection postpartum.

Stages of Labor

Labor is the physiological process by which the fetus, placenta, and membranes are expelled from the uterus. It is divided into four distinct stages, each with specific maternal and fetal considerations.

Stage 1: Cervical Dilation

Phase	Cervical Dilation	Contractions	Nursing Interventions
Latent (Early)	1–3 cm	Mild; every 15–30 min	Encourage rest, hydration, relaxation.
Active	4–7 cm	Moderate; every 3–5 min	Monitor FHR, contractions, vitals.
Transition	8–10 cm	Strong; every 2–3 min	Provide comfort, assist breathing, prepare for delivery.

Stage 2: Delivery of the Baby

Begins with full dilation (10 cm) and ends with the birth of the infant.
Nursing focus includes:

Monitoring fetal descent and heart rate.
Supporting maternal pushing efforts.
Observing for perineal tearing or cord complications.

Stage 3: Delivery of the Placenta

This stage typically lasts 5–30 minutes.
Nursing care involves:

Inspecting the placenta (should contain two arteries and one vein).
Monitoring uterine tone and maternal bleeding.
Managing potential hemorrhage or retained tissue.

Stage 4: Recovery Period

The immediate 1–4 hours following placental delivery are critical for stabilizing the mother.
Key assessments include:

Fundal firmness and position.
Vital signs and lochia characteristics.
Observation for postpartum hemorrhage or infection.

True vs. False Labor

Differentiating between true and false labor helps prevent unnecessary hospital admissions and guides appropriate timing for delivery.

Feature	True Labor	False Labor
Cervical Changes	Progressive dilation and effacement	No significant change
Contraction Pattern	Regular, increasing intensity	Irregular, variable
Pain Location	Lower back radiating to abdomen	Primarily abdominal
Effect of Movement	Intensifies with walking	Often decreases or ceases
Fetal Engagement	Presenting part descends into pelvis	Not engaged
Bloody Show	Usually present	Absent

Fetal Heart Rate Patterns and Interpretation (VEAL CHOP)

This mnemonic assists clinicians in correlating fetal heart rate (FHR) changes with their causes and interventions.

Deceleration Type	Cause	Intervention	Interpretation
Variable	Cord compression	Reposition mother, discontinue oxytocin, oxygen, amnioinfusion	Non-reassuring
Early	Head compression	Continue monitoring	Normal (benign)
Late	Uteroplacental insufficiency	Reposition, oxygen, fluids, discontinue oxytocin	Non-reassuring

Hypertension in Pregnancy

Hypertension during pregnancy is a major cause of maternal and fetal morbidity and mortality. It is defined as systolic ≥140 mmHg or diastolic ≥90 mmHg.

Clinical Manifestations

Severe headache
Epigastric or right upper quadrant pain
Visual disturbances
Oliguria (decreased urine output)
Hyperreflexia
Sudden weight gain and edema

Risk Factors

Category	Examples
Maternal History	Previous preeclampsia, family history
Medical Conditions	Diabetes, renal disease, autoimmune disorders
Demographics	Age <18 or >35, first pregnancy
Lifestyle	Obesity, poor nutrition, stress

Complications

Preeclampsia: Characterized by hypertension, proteinuria, and edema.
HELLP Syndrome: Hemolysis, Elevated Liver enzymes, and Low Platelets — a severe, life-threatening condition.
Eclampsia: Progression of preeclampsia leading to seizures or coma.

Treatment:

Administration of magnesium sulfate to prevent seizures.
Calcium gluconate serves as the antidote for magnesium toxicity.
Continuous monitoring of reflexes, urine output, and respiratory status is essential.

Factors Affecting Labor: The 5 P’s

Factor	Description
Passenger	The fetus and placenta; includes size, presentation, lie, and attitude.
Passageway	The birth canal including the bony pelvis and soft tissues.
Powers	Strength and frequency of uterine contractions and maternal pushing efforts.
Position	Maternal posture during labor which affects comfort and efficiency of contractions.
Psychology	Emotional state and mental readiness; anxiety can impede labor progress.

Fetal Position and Presentation

Concept	Definition
Presentation	The part of the fetus entering the pelvis first (e.g., cephalic, breech, or shoulder).
Lie	The alignment of the fetal spine relative to the mother’s spine (longitudinal, transverse, or oblique).

Clinical Importance:

Cephalic presentation (head first) is ideal for vaginal birth.
Transverse or oblique lies typically require cesarean delivery for safety.

References

American College of Obstetricians and Gynecologists. (2020). Practice Bulletin No. 217: Prelabor Rupture of Membranes. Obstetrics & Gynecology, 135(3), e90–e102.
Elsevier. (2023). Maternity and Pediatric Nursing (Latest Edition)