What should be included in trimester history according to latest update
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trimester history obstetric antenatal history taking components 2024 2025
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https://geekymedics.com/obstetric-history-taking
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NICE antenatal care trimester history taking first second third 2023 2024 guidelines
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The textbook section on "PREGNANCY HISTORY" in Creasy & Resnik covers the context of stillbirth evaluation rather than routine antenatal trimester-by-trimester history taking. Let me now compile a comprehensive answer from all the gathered sources (NICE NG201, Geeky Medics OSCE guide, StatPearls, and textbook content).
Trimester History in Obstetric/Antenatal History Taking
The "trimester history" refers to systematically recording what happened - or should happen - during each trimester of the current pregnancy. It is a subsection within the broader current pregnancy history. Here is what should be included according to current practice (NICE NG201, last reviewed December 2024; Geeky Medics OSCE guidelines; StatPearls/ACOG):
First Trimester (Weeks 1-12)
| Item | Detail |
|---|---|
| LMP & EDD | Last menstrual period date; estimated date of delivery (Naegele's rule or US dating) |
| Dating ultrasound | Crown-rump length at 11-13+6 weeks; confirm singleton vs. multiple gestation; chorionicity if twins |
| Booking visit | Gestation at first antenatal contact (ideally by 10 weeks) |
| Combined screening | Nuchal translucency + PAPP-A + free β-hCG (11-13+6 weeks) for Down syndrome/trisomies; result and counselling given |
| Booking bloods | FBC, blood group & Rh type, red cell antibodies, rubella immunity, syphilis, HIV, hepatitis B, haemoglobin electrophoresis (if indicated) |
| Urine culture | Mid-stream urine for asymptomatic bacteriuria |
| Symptoms | Nausea/vomiting (hyperemesis gravidarum), bleeding (threatened miscarriage, implantation), pelvic pain |
| Folic acid | Whether 400 mcg (or 5 mg high-dose) was taken pre-conception and throughout first trimester |
| Pre-eclampsia risk assessment | NICE NG201: assessed at booking; aspirin 75-150 mg from 12 weeks if high risk |
| Medications & teratogen exposure | First trimester is the critical period for organogenesis |
| Smoking, alcohol, drugs | Social history assessed at booking |
Second Trimester (Weeks 13-27)
| Item | Detail |
|---|---|
| Anatomy (anomaly) scan | 18-20+6 weeks - cardiac, neural tube, abdominal wall defects, renal anomalies, placental location |
| Fetal movements | Onset of quickening (typically 16-20 weeks); whether normal |
| Serum screening (if not done) | Quadruple test (AFP, hCG, uE3, inhibin A) at 14-20 weeks if combined test not done |
| Cervical length | In women with prior preterm birth; cervical incompetence screening |
| Glucose challenge/GDM screening | 24-28 weeks (OGTT); risk assessment reviewed |
| Blood pressure checks | At each visit; re-assess pre-eclampsia risk (NICE NG201 recommends second risk assessment in second trimester) |
| Urine protein | Dipstick at each visit |
| Amniocentesis or CVS | If chromosomal testing elected; result and follow-up |
| Vaccinations | Pertussis (whooping cough) vaccine offered 16-32 weeks (ideally 20 weeks) in UK |
| Growth and placenta review | Placenta previa check at 20 weeks - if low-lying, arrange rescan at 32 weeks |
| Symptoms | Bleeding, discharge, pelvic girdle pain (symphysis pubis dysfunction), reflux, oedema |
Third Trimester (Weeks 28-40+)
| Item | Detail |
|---|---|
| Growth scans | Symphysis-fundal height (SFH) plotted at every visit from 24 weeks; growth scans if concern |
| Repeat bloods | FBC and blood group antibodies at 28 weeks; haemoglobin to check for anaemia |
| Rh prophylaxis | Anti-D immunoglobulin at 28 (and 34) weeks if Rh negative |
| GBS screening | Vaginal/rectal swab at 36-37+6 weeks (ACOG recommendation) |
| Fetal presentation | Checked from 36 weeks; breech - offer ECV at 36+ weeks |
| Fetal movements | Any reduction reported; kick counts or formal monitoring |
| CTG / biophysical profile | If high-risk or post-term |
| Repeat HIV, syphilis, HBV | In high-risk patients (CDC recommends 28-36 weeks) |
| Blood pressure + proteinuria | Continued at every visit - pre-eclampsia surveillance |
| Planned mode of delivery | Vaginal vs. caesarean discussed; birth plan |
| Gestational diabetes management | Blood glucose monitoring, insulin if required |
| Placenta previa | If persisting at 32-week rescan, plan for elective C-section |
| Vitamin K & breastfeeding discussions | Antenatal counselling |
| Influenza vaccine | Offered at any gestation |
| Mental health | Screen for antenatal anxiety/depression at every trimester |
Overall Antenatal History Structure (Surrounding the Trimester History)
The trimester history sits within this broader framework:
- Presenting complaint - reason for current visit
- Current pregnancy history - EDD, gestation, trimester-by-trimester review (above)
- Past obstetric history (POH) - GTPAL, previous pregnancies and their outcomes, complications (PPH, pre-eclampsia, preterm birth, stillbirth, C-sections)
- Past medical/surgical history - hypertension, DM, epilepsy, cardiac disease, thromboembolic disease, renal disease, thyroid disorders, prior surgeries
- Drug history - current medications, teratogens, folic acid, aspirin, iron, vitamin D, antiemetics
- Allergy history
- Family history - genetic conditions, DM, hypertension, recurrent miscarriage, congenital anomalies
- Social history - smoking, alcohol, illicit drugs, occupation, housing, domestic violence screening
- Immunisation history - flu, pertussis, hepatitis B (if at risk)
- Mental health history - perinatal mental health screening each trimester
- ICE - patient's ideas, concerns, and expectations
Key sources:
- NICE NG201 Antenatal Care guideline (last reviewed December 2024)
- Geeky Medics Obstetric History OSCE Guide
- StatPearls - Antepartum Care 2nd and 3rd Trimester
- Creasy & Resnik's Maternal-Fetal Medicine, Pregnancy History section
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