Pre-conception - advice and management
Exam Tips
- Pre-conception care is a continuum: exam answers score highly when you structure it as risk identification, optimisation, and planned conception rather than a one-off visit.
- Always state folic acid doses explicitly: 400 micrograms daily standard, 5 mg daily if high risk, both continued to 12 weeks.
- In SBA questions, do not advise abrupt cessation of psychotropic or antiepileptic drugs; prioritise specialist review and effective contraception until plan agreed.
- Flag key contraindications: ACE inhibitors/ARBs and valproate are major pre-conception medication safety red flags.
- A complete UK-focused assessment includes vaccination/immunity status (rubella/varicella), infection risk (HIV/HBV), cervical screening, substance use, and chronic disease optimisation.
- See Figure from page 1 (pre-conception care pathway in your revision notes): timeline from pre-conception assessment to first-trimester risk reduction.
Definition
Pre-conception care is proactive clinical assessment and risk reduction before conception, delivered as an ongoing process rather than a single appointment. In UK practice it combines biomedical, behavioural, medication, and social interventions to improve fertility, reduce preventable maternal-fetal harm in early gestation, and support informed reproductive decision-making.
Pathophysiology
Early embryogenesis (including neural tube closure by day 28 post-conception) occurs before many people present for antenatal care, so pre-existing maternal factors at conception strongly influence outcomes. Hyperglycaemia, teratogenic medicines, micronutrient deficiency (especially folate), obesity, smoking, alcohol, infections, and uncontrolled chronic disease can alter placentation, organogenesis, and epigenetic programming, increasing miscarriage, congenital anomaly, preterm birth, fetal growth problems, and maternal morbidity. Optimising health before conception reduces these biological insults during the critical peri-implantation and first-trimester window.
Risk Factors
- Maternal age over 35 years (higher risk of miscarriage, chromosomal and obstetric complications)
- Very short or very long interpregnancy interval (especially under 6 months or over 60 months)
- Obesity (high BMI) or underweight status
- Smoking, alcohol use, and recreational drug use
- No folic acid supplementation before conception
- Pre-existing diabetes, epilepsy, thyroid, renal, cardiac, hypertensive, rheumatological, inflammatory bowel, or significant mental health disorders
- Use of potentially teratogenic medicines (for example sodium valproate, ACE inhibitors, ARBs, statins)
- Non-immunity to rubella or varicella
- Blood-borne virus risk (hepatitis B/HIV), occupational toxin/radiation exposure, or travel to areas with Zika transmission
- Personal or family history suggesting inherited genetic disease or haemoglobinopathy
Clinical Features
Symptoms
- Often asymptomatic and identified opportunistically during routine consultations
- Desire to conceive and questions about fertility timing
- History suggestive of subfertility, irregular cycles, or previous pregnancy loss
- Symptoms related to chronic disease control (for example hyper/hypoglycaemia, seizure activity, thyroid symptoms, mood instability)
Signs
- Abnormal BMI (overweight/obesity or low BMI)
- Raised blood pressure or signs of poorly controlled chronic disease
- Evidence of smoking/alcohol/drug harm or withdrawal patterns
- Medication profile including teratogenic or prolactin-raising agents
- Cervical screening not up to date
Investigations
Management
Lifestyle Modifications
- Discuss reproductive timeline: explain age-related fertility decline and increased miscarriage/obstetric risk after 35 years
- Advise regular intercourse every 2-3 days when trying to conceive; avoid stressful ovulation-timing overfocus
- Offer weight optimisation support before conception (diet, activity, behavioural change)
- Stop smoking and avoid second-hand smoke exposure
- Avoid alcohol when planning pregnancy and once pregnancy is possible
- Stop recreational drugs and offer dependency support where needed
- Review occupational hazards (solvents, heavy metals, ionising radiation) and implement workplace risk reduction
- Check travel plans, including Zika-risk areas, and give destination-specific conception advice
- Update vaccinations pre-pregnancy where indicated; avoid conception for 1 month after live vaccines such as MMR/varicella
- Provide condition-specific pre-conception referral for complex disease (for example diabetes clinic, specialist epilepsy, perinatal mental health)
Pharmacological Treatment
Folate supplementation
- Folic acid 400 micrograms once daily from pre-conception until 12 weeks' gestation
- Folic acid 5 mg once daily from pre-conception until 12 weeks' gestation for high neural tube defect risk (for example diabetes, antiepileptic therapy, previous NTD pregnancy, BMI 30 kg/m2 or above)
Start before conception because neural tube closure occurs very early; prescribe 5 mg strength when high risk.
Diabetes optimisation (specialist-led)
- Metformin immediate-release 500 mg once daily with food, titrated as tolerated (commonly up to 2 g/day in divided doses)
- Insulin therapy individualised when glycaemic targets are not met or oral therapy is unsuitable
Aim for tight glucose control before conception; avoid teratogenic agents and coordinate with a pre-conception diabetes clinic.
Hypertension medication switch before conception
- Labetalol 100 mg twice daily initially (titrate according to BP response)
- Modified-release nifedipine 30 mg once daily initially
- Methyldopa 250 mg two or three times daily initially
ACE inhibitors and ARBs are contraindicated in pregnancy because of fetotoxicity; switch before conception where possible.
Mental health and neurology medication safety
- Avoid sodium valproate in women who could conceive unless no effective alternative and strict Pregnancy Prevention Programme criteria are met
- Do not stop antidepressants, antipsychotics, mood stabilisers, or antiepileptics abruptly without specialist input
Relapse risk from untreated illness can be high; severe or past severe mental illness should trigger specialist perinatal mental health planning.
Immunisation-related prescribing
- MMR vaccine (if rubella non-immune and not pregnant)
- Varicella vaccine (if non-immune and at risk)
Live vaccines are given pre-conception only; advise avoiding pregnancy for 1 month after vaccination.
Complications
- Neural tube defects with inadequate folate prophylaxis
- Miscarriage and chromosomal-related pregnancy loss (risk rises with maternal age)
- Congenital malformations from uncontrolled diabetes or teratogenic drug exposure
- Preterm birth, fetal growth restriction, stillbirth, and neonatal morbidity
- Maternal deterioration from poorly controlled chronic disease (for example severe hypertension, epilepsy relapse, psychiatric relapse)
- Vertical transmission risks with untreated maternal infections
Prognosis
When pre-conception optimisation is undertaken, pregnancy outcomes are generally improved, with lower preventable maternal and fetal risk and better chronic disease control entering pregnancy. Prognosis is less favourable when conception occurs with uncontrolled comorbidity, high-risk medication exposure, or ongoing harmful lifestyle factors, but targeted multidisciplinary care can still substantially reduce harm.
Sources & References
✅NICE Guidelines(1)
- Pre-conception - advice and management[overview]