Chapter7
Assessment foundations

Obstetric History and Terminology

IBSC domain: AssessmentsEstimated study time: 90–120 minutesDifficulty: Foundational–IntermediateClinical review: July 2026
Educational use onlyThis chapter supports certification preparation and clinical reasoning. Follow local policy, scope of practice, medical direction, and the established obstetric record.

Learning objectives

After completing this chapter, you should be able to interpret obstetric terminology, calculate GTPAL accurately, determine how gestational dating was established, recognize history patterns that change transport risk, and communicate uncertainty without inventing clinical details.

Maternal transport clinicians obtaining a focused bedside history from a pregnant patient.
The obstetric history is operational information. It helps the team anticipate hemorrhage, rupture, preterm delivery, neonatal needs, and destination capability. AI-generated clinical training image.

The transport history must answer

1

What is happening now?
Symptoms, maternal status, fetal status, urgency.

2

How far along?
Documented gestational age, EDD, dating source.

3

What can recur?
Prior hemorrhage, preterm birth, hypertension, surgery.

4

What capability is needed?
Obstetric surgery, blood, anesthesia, neonatal care.

Mother–fetus connectionA history item may affect two patients. Gestational age predicts neonatal vulnerability; maternal hemorrhage and prior uterine surgery influence both maternal perfusion and fetal oxygen delivery.

Opening transport scenario

A 32-year-old patient at a documented 33 5/7 weeks’ gestation is being transferred for painless vaginal bleeding. The referral note lists G4P2103, placenta previa, one prior cesarean birth, Rh-negative blood type, and an unknown group B Streptococcus result. She reports a prior postpartum hemorrhage requiring transfusion.

PlacentaPrevia

Bleeding may become sudden and severe.

UterusPrior cesarean

Raises concern for abnormal placental adherence when previa is present.

HistoryPrior PPH

Supports early hemorrhage readiness.

Fetus33 5/7 weeks

Requires appropriate neonatal capability.

The history changes equipment, vascular access, blood-product planning, destination selection, and the threshold for diversion.

1. Why obstetric history matters during transport

A focused obstetric history is not a ceremonial intake. It is a risk-prediction tool. It should clarify the present emergency, the reliability of gestational dating, the previous pregnancy story, and the resources that may be needed before arrival.

NOW

Current physiology

Bleeding, pain, contractions, membranes, fetal status, vital-sign trend.

WHEN

Gestational age

Exact weeks and days, EDD, and source of dating.

BEFORE

Prior outcomes

Delivery mode, hemorrhage, hypertension, prematurity, neonatal course.

NEXT

Capability needs

Blood, surgery, anesthesia, maternal subspecialty, and neonatal level.

Clinical trapDo not complete a long history before treating active hemorrhage, seizure, airway failure, shock, cord prolapse, imminent birth, or fetal bradycardia. Stabilize first and gather history in parallel when possible.

2. Gravida, para, and GTPAL

Gravida is the total number of pregnancies, including the current pregnancy. Para summarizes pregnancies reaching the local reporting threshold. GTPAL expands that summary into term, preterm, abortion, and living categories.

GGravida

All pregnancies, including current.

TTerm

Pregnancies delivered at term.

PPreterm

Pregnancies delivered before 37 0/7 weeks but after the reporting threshold.

AAbortions

Pregnancies ending before the reporting threshold.

LLiving

Living children at the time of history.

Current pregnancy+1 gravida
Prior term singletonT1, L1
Prior preterm twins, both livingP1, L2
One early lossA1
Final summary: G4 T1 P1 A1 L3

Twins count as one pregnancy in the T or P category but may contribute two living children. The documentation threshold is often 20 weeks, but local definitions vary and should not be treated as a universal definition of viability.

A current pregnancy follows one term singleton birth, one preterm twin birth with both twins living, and one early loss. What is the GTPAL?

Answer: G4 T1 P1 A1 L3.

3. Gestational age and estimated due date

Transport clinician reviewing prenatal records and communicating with the receiving team.
Dating is a documented clinical conclusion. Record the established EDD and its source instead of independently replacing it during transport. AI-generated clinical training image.

Preferred information hierarchy

  1. Assisted-reproduction dating, when applicable
  2. First-trimester ultrasound
  3. Reliable LMP with consistent cycle history
  4. Later ultrasound
  5. Physical examination as supportive context
33 5/733 completed weeks + 5 days

Gestational age is conventionally measured from the first day of the last menstrual period. For a regular 28-day cycle, the estimated due date is approximately 280 days from the first day of the LMP. The established obstetric EDD should be documented early and changed only for defined reasons by the obstetric team.

Paramedic bridgeThink of gestational dating like a verified medication concentration: use the established source, document uncertainty, and do not silently substitute your own estimate.
The patient says “about 31 weeks,” but the chart says 32 6/7 weeks from a first-trimester ultrasound. What should you document?

Answer: The established chart dating and source, plus the patient’s differing statement and any clarification obtained.

4. Gestational-age categories

<37 0/7Preterm
37 0/7–38 6/7Early term
39 0/7–40 6/7Full term
41 0/7–41 6/7Late term
≥42 0/7Postterm

The last weeks of pregnancy are not physiologically interchangeable. Use the precise category rather than the generic word “term.” A pregnancy with no ultrasound confirming or revising dating before 22 0/7 weeks is considered suboptimally dated by ACOG.

5. Current-pregnancy history

Dating and fetal profile

  • Gestational age, EDD, and source
  • Singleton or multifetal
  • Presentation and placental location
  • Growth, fluid, and known anomaly

Current symptoms

  • Bleeding or fluid loss
  • Contractions and urge to push
  • Fetal movement
  • Pain, headache, dyspnea, fever

Pregnancy complications

  • Hypertension or diabetes
  • Placental disease
  • Infection or thromboembolism
  • Cardiac, respiratory, or renal disease

Treatments and records

  • Medications and infusions
  • Allergies
  • Recent labs, ultrasound, and FHR
  • Planned destination and delivery mode
Maternal and fetal monitoring during transport assessment.
History and current assessment must agree. A documented gestational age, placental location, membrane status, and fetal trajectory give meaning to the monitor and maternal vital signs. AI-generated clinical training image.

6. Prior-pregnancy history that changes transport risk

HEM

Hemorrhage

Prior PPH, transfusion, accreta, previa, abruption, retained placenta, inversion.

HTN

Hypertension

Preeclampsia, eclampsia, HELLP, pulmonary edema, stroke.

PTB

Prematurity

Spontaneous or indicated preterm birth, PPROM, cervical procedures.

DEL

Delivery complications

Shoulder dystocia, operative delivery, uterine rupture, difficult anesthesia.

F/N

Fetal and neonatal

Stillbirth, neonatal death, NICU admission, anomaly, growth restriction.

MED

Medical complications

Diabetes, thrombosis, cardiomyopathy, severe infection, psychiatric crisis.

A parity code cannot reveal these events. Ask for the story of each clinically important pregnancy.

7. Previous cesarean delivery and uterine surgery

What you can see

Abdominal skin scar

Does not reliably identify the uterine incision.
→

What you need to know

Low-transverse, classical, T/J extension, prior rupture, myomectomy, or other cavity-entering surgery

Obtain the operative record when possible.
Transport decision pointComplete placenta previa over a prior cesarean scar should trigger early communication about placenta accreta spectrum, hemorrhage resources, anesthesia, blood bank, operative capability, and destination time.

8. Prenatal records and laboratory history

DATE

Pregnancy dating

EDD, dating ultrasound, gestational age.

LAB

Core labs

ABO/Rh, antibody screen, CBC/platelets, infectious screening.

GBS

Intrapartum infection risk

GBS result and antibiotic plan when relevant.

US

Imaging

Placenta, fetal number, presentation, growth, fluid, anomalies.

FHR

Fetal assessment

Most recent tracing, Doppler, biophysical testing, trajectory.

OP

Prior operative records

Uterine incision, accreta surgery, myomectomy, complications.

Routine prenatal testing commonly includes blood type and Rh factor, antibody screening, complete blood count, urinalysis, urine culture, and infectious-disease testing. GBS screening is performed during each pregnancy because the result can affect intrapartum antibiotic planning.

9. Common obstetric terminology

AntepartumBefore labor or birth
IntrapartumDuring labor and birth
PostpartumAfter birth
PrimigravidaFirst pregnancy
MultigravidaMore than one pregnancy
NulliparaNo prior pregnancy reaching parity threshold
PrimiparaOne prior pregnancy reaching threshold
MultiparaTwo or more prior pregnancies reaching threshold
PROMMembranes rupture before labor
PPROMPreterm prelabor rupture of membranes
CephalicHead-first presentation
Transverse lieFetal long axis across maternal abdomen

10. A transport-focused interview sequence

1

Threats first

Stabilize bleeding, seizure, airway, shock, cord prolapse, or imminent birth.

→
2

Dating and reason

Exact GA, EDD source, transfer diagnosis, current symptoms.

→
3

Current fetal status

Movement, FHR, presentation, membranes, contractions.

→
4

Risk history

Prior surgery, hemorrhage, hypertension, prematurity, neonatal course.

→
5

Reconcile and report

Records, medications, acceptance, capability, and contingency plan.

11. Evolving case study

Phase 1: Decode the parity

The patient is recorded as G4P2103. You verify two term births, one preterm birth, no pregnancy losses, and three living children. The current pregnancy makes gravida four.

Phase 2: Identify the pattern

The ultrasound documents complete placenta previa overlying the prior cesarean scar. The patient reports prior major postpartum hemorrhage. The crew verifies large-bore access, hemorrhage supplies, blood availability, and immediate receiving capability.

Phase 3: Resolve dating conflict

The patient says “about 32 weeks,” while the prenatal record lists 33 5/7 weeks from a first-trimester ultrasound. You document the established dating and the patient’s statement; you do not replace the EDD.

Phase 4: Reassess the destination

Bleeding increases and tachycardia develops. The planned center is 40 minutes away, while a hospital with obstetric surgery, anesthesia, blood bank, and neonatal stabilization is 9 minutes away. The history supports immediate escalation and diversion discussion.

12. High-yield chapter summary

  1. Gravida includes the current pregnancy.
  2. GTPAL counts pregnancies in T, P, and A; L counts children.
  3. Twins are one pregnancy but may add two living children.
  4. Use the established obstetric EDD and dating source.
  5. First-trimester ultrasound is the most accurate routine ultrasound method for dating.
  6. Use precise gestational-age categories.
  7. Prior pregnancy complications alter transport readiness.
  8. The uterine incision matters more than the skin scar.
  9. Prior cesarean plus placenta previa is a major hemorrhage-risk pattern.
  10. Document uncertainty and conflicting sources.
  11. History must never delay stabilization.

References

  1. American College of Obstetricians and Gynecologists. Methods for Estimating the Due Date. Committee Opinion No. 700.
  2. American College of Obstetricians and Gynecologists. Definition of Term Pregnancy. Committee Opinion No. 579.
  3. American College of Obstetricians and Gynecologists. Obstetric Patient Record Forms.
  4. American College of Obstetricians and Gynecologists. reVITALize: Obstetrics Data Definitions.
  5. American College of Obstetricians and Gynecologists. Routine Tests During Pregnancy.
  6. American College of Obstetricians and Gynecologists. Placenta Accreta Spectrum.
  7. Centers for Disease Control and Prevention. Screening for Group B Streptococcus Bacteria. Updated May 2025.
  8. International Board of Specialty Certification. Maternal Fetal Transport Microcredential Candidate Handbook. 2026.
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Chapter assessment

Twenty-question obstetric history quiz

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