2.2 Public Health, Social Determinants & Health Inequalities

Public Health, Social Determinants & Health Inequalities

The NMC Future Midwife standards position public health promotion, disease prevention, and the eradication of health inequalities at the center of professional practice. Pregnancy represents an extraordinary "teachable moment" in a woman's life course—a window where motivation to adopt health-protective behaviors is elevated and contact with healthcare services is frequent and structured. Midwives operate on the frontline of public health, charged with recognizing how wider social, economic, and environmental conditions shape clinical outcomes.

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The Midwife's Public Health Mandate & MECC

Public health in midwifery transcends isolated clinical tasks such as measuring blood pressure or collecting urine samples. It encompasses a holistic appraisal of the woman's life circumstances, living conditions, psychological well-being, and social support networks. UK policy embeds this philosophy through the Making Every Contact Count (MECC) approach.

Making Every Contact Count (MECC)

MECC is an evidence-based behavioral framework that encourages healthcare professionals to use routine clinical interactions to engage individuals in open, non-judgmental conversations regarding lifestyle factors that impact long-term health. Rather than waiting for illness to manifest, midwives use every contact to deliver:

• Primary Prevention: Interventions delivered to healthy populations to prevent disease or trauma before it occurs. In maternity, this includes preconception education, universal micronutrient supplementation, smoking cessation, and routine maternal immunisation (pertussis, seasonal influenza, COVID-19, and respiratory syncytial virus [RSV]).
• Secondary Prevention: Early detection and prompt clinical intervention to arrest disease progression. Examples include universal carbon monoxide (CO) screening, serological screening for infectious diseases (HIV, hepatitis B, syphilis), targeted screening for gestational diabetes mellitus (GDM), and universal mental health inquiry.
• Tertiary Prevention: Managing established clinical conditions to minimize long-term disability and prevent acute complications. Examples include multidisciplinary care plans for women with pre-existing diabetes, chronic hypertension, or severe psychiatric disorders.

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Social Determinants of Health: The Marmot Review

Health outcomes are overwhelmingly determined by conditions outside healthcare facilities: the distribution of money, power, resources, housing, and social status. In his seminal report, Fair Society, Healthy Lives (2010), updated in Marmot 10 Years On (2020), Sir Michael Marmot articulated the concept of the social gradient in health.

The Social Gradient

The social gradient demonstrates that health inequalities are not confined to a binary divide between the rich and the poorest in society. Instead, health outcomes follow a continuous, stepwise gradient: across all socioeconomic strata, individuals with lower socioeconomic status experience higher rates of chronic illness, worse pregnancy outcomes, and shorter disability-free life expectancy than those immediately above them.

Socioeconomic Position                  Maternal & Perinatal Health Gradient
┌────────────────────────────┐          ┌────────────────────────────────────────────────────────┐
│ Most Affluent Quintile     │ ───────► │ Lowest preterm birth, lowest stillbirth & mortality   │
├────────────────────────────┤          ├────────────────────────────────────────────────────────┤
│ Quintile 4                 │ ───────► │ Slightly elevated morbidity vs Quintile 5              │
├────────────────────────────┤          ├────────────────────────────────────────────────────────┤
│ Quintile 3 (Middle)        │ ───────► │ Intermediate clinical risk & intervention rates        │
├────────────────────────────┤          ├────────────────────────────────────────────────────────┤
│ Quintile 2                 │ ───────► │ Elevated risk of IUGR, maternal chronic illness        │
├────────────────────────────┤          ├────────────────────────────────────────────────────────┤
│ Most Deprived Quintile (Q1)│ ───────► │ ~2x maternal death, highest preterm birth & stillbirth │
└────────────────────────────┘          └────────────────────────────────────────────────────────┘

Marmot identified six core policy objectives to dismantle this gradient, declaring that "Giving every child the best start in life" is the single highest priority. Disadvantages accumulated during pregnancy and early infancy inflict irreversible biological and cognitive damage that compounds across the lifespan.

Social determinants commonly encountered by UK midwives include:

• Housing Deprivation: Overcrowding, damp, mold, and housing instability, which directly exacerbate maternal respiratory illness, chronic stress, and infant infection.
• Food Insecurity: Economic inability to purchase nutritionally dense foods, leading to micronutrient deficiencies, poor fetal growth, or maternal obesity.
• Fuel Poverty: Inability to heat homes, predisposing neonates to neonatal hypothermia and respiratory infections.
• Digital & Linguistic Exclusion: Lack of internet access or English language proficiency, preventing women from navigating appointment booking or receiving clinical safety advice.

Core20PLUS5 Framework & MBRRACE-UK Evidence

To tackle persistent inequalities systematically, NHS England launched the Core20PLUS5 framework. This targeted approach directs national clinical focus and financial resources toward population groups experiencing the most extreme health disparities.

Core20PLUS5 Maternity Architecture

• Core20: The most deprived 20% of the national population, identified by the national Index of Multiple Deprivation (IMD) quintile 1. These women experience cumulative socioeconomic hardships.
• PLUS: Population groups who experience disproportionate healthcare barriers and poorer outcomes regardless of geographic deprivation. In maternity, this includes ethnic minority women, refugees and asylum seekers, Gypsy, Roma, and Traveller communities, incarcerated pregnant women, sex workers, and homeless women.
• 5: Five targeted clinical focus areas where targeted interventions will yield the largest reduction in avoidable death. Maternity is a priority clinical area, with specific national mandates to reduce maternal mortality, stillbirth, neonatal death, and brain injury.

MBRRACE-UK Surveillance Findings

The starkest evidence of maternity inequalities in the UK stems from the MBRRACE-UK (Mothers and Babies: Reducing Risk through Audits and Confidential Enquiries across the UK) surveillance reports. These ongoing national confidential enquiries audit every maternal and perinatal death across the United Kingdom.

The 2026 MBRRACE-UK maternal report (deaths in 2022–24, published September 2026) again showed marked ethnic and socioeconomic disparities in maternal death:

Underlying Systemic Drivers & Anti-Racist Practice

MBRRACE-UK audits clarify that these ethnic disparities cannot be explained away by socioeconomic deprivation, body mass index, or pre-existing medical conditions alone. Significant systemic and institutional factors drive these statistics:

• Implicit Bias & Stereotyping: Unconscious prejudices influencing clinician perception, such as dismissing symptoms or pain in minoritized women as "exaggerated" or psychosomatic.
• Diagnostic Overshadowing: Attributing physical symptoms of life-threatening disease (such as pre-eclampsia, sepsis, or pulmonary embolism) to anxiety, non-compliance, or cultural traits.
• Failure to Escalate: Repeated clinical notes recording maternal intuition and concern ("woman feels something is wrong") that were dismissed by clinicians without physical examination or senior escalation.
• Inadequate Interpretation Services: Relying on family members, partners, or unqualified staff to interpret during clinical appointments breaches confidentiality, conceals domestic abuse, and leads to dangerous diagnostic omissions. Midwives must always engage accredited professional interpreters.

Smoking Cessation: Universal CO Screening & NRT Safety

Tobacco smoking remains the single most important modifiable risk factor for poor pregnancy outcomes in high-income countries. Combusted tobacco smoke exposes both mother and fetus to over 4,000 toxic compounds, most notably carbon monoxide (CO) and nicotine.

Pathophysiology of Tobacco Exposure

• Carbon Monoxide: Inhaled CO diffuses rapidly across the alveolar-capillary barrier and crosses the placenta by passive diffusion. Carbon monoxide binds to fetal haemoglobin with an affinity over 200 times greater than oxygen, forming carboxyhaemoglobin. This shifts the oxygen-haemoglobin dissociation curve to the left, precipitating chronic, severe fetal hypoxia and metabolic compromise.
• Nicotine: Nicotine crosses the placental barrier, reaching fetal concentrations 15% higher than maternal levels. Nicotine stimulates adrenergic receptors, causing severe constriction of the uterine arcuate and umbilical arteries. This vasoconstriction impairs placental perfusion, leading to fetal growth restriction (FGR).
• Clinical Risks: Smoking in pregnancy markedly increases the risks of spontaneous miscarriage, placental abruption, placenta praevia, preterm premature rupture of membranes (PPROM), low birth weight (<2,500 g), and Sudden Infant Death Syndrome (SIDS).

Universal Carbon Monoxide (CO) Breath Monitoring

The Saving Babies' Lives Care Bundle version 3 sets CO breath testing for every woman at the booking appointment and at 36 weeks. NICE NG209 adds CO testing at all other antenatal appointments for women who smoke, are quitting, used to smoke, or tested at 4 ppm or above:

                               Universal Carbon Monoxide (CO) Screening
                                    (Antenatal Booking & 36 Weeks)
                                                  │
                                    Perform Exhaled Breath Test
                                                  │
                    ┌─────────────────────────────┴─────────────────────────────┐
                    ▼                                                           ▼
         CO Reading < 4 ppm                                          CO Reading ≥ 4 ppm
  (Normal Non-Smoker Baseline)                               (Indicates Tobacco or Toxic Exposure)
                    │                                                           │
         Reinforce smoke-free status                                 Automatic Opt-Out Referral
         Discuss passive smoke risks                          (Specialist Maternity Stop-Smoking Service)
                                                                                │
                                                              Evaluate Environmental Sources
                                                              (Faulty gas heaters, boilers, exhaust)

• Action Threshold: A breath reading of ≥4 parts per million (ppm) indicates active smoking, waterpipe (shisha) use, heavy passive smoke inhalation, or dangerous environmental exposure to a faulty domestic heating appliance.
• Opt-Out Referral: Every woman recording a CO reading of ≥4 ppm (or who self-reports tobacco use) is automatically referred to a dedicated, specialist maternity stop-smoking advisor under an opt-out system. Opt-out systems eliminate stigma, normalize support, and dramatically increase engagement compared to traditional opt-in pathways.

Safety & Prescribing of Nicotine Replacement Therapy (NRT)

Nicotine is a toxin, but clean therapeutic nicotine (NRT) does not contain carbon monoxide, tar, hydrogen cyanide, or carcinogenic polycyclic aromatic hydrocarbons. The clinical standard is unequivocal: NRT is far safer than continuing to smoke combusted tobacco.

• Formulations: Short-acting products (lozenges, chewing gum, microtabs, inhalators, mouth sprays) deliver nicotine on demand. Combining a patch with a short-acting product is more effective than a single product.
• Transdermal Patches: Patches are useful, especially when nausea and vomiting make oral products difficult. NICE advises women to remove patches before going to bed, so a patch is worn for no more than 16 hours in each 24 hours.
• Contraindicated Medications: Varenicline (Champix) and Bupropion (Zyban) are not recommended during pregnancy and lactation due to insufficient safety data and potential fetal toxicity.

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Alcohol, Substance Misuse & Harm Reduction

Fetal Alcohol Spectrum Disorder (FASD)

Ethanol is a direct, irreversible teratogen. Alcohol diffuses freely across the placenta, achieving fetal blood alcohol concentrations equal to maternal blood levels within minutes. The immature fetal liver possesses negligible amounts of alcohol dehydrogenase and cannot metabolize ethanol, trapping the fetus in prolonged toxic amniotic circulation.

Fetal Alcohol Spectrum Disorder (FASD) is an umbrella term encompassing irreversible physical, cognitive, and behavioral disabilities caused by prenatal alcohol exposure. Features include:

• Facial Dysmorphology: Smooth philtrum, exceptionally thin vermilion border of the upper lip, and short palpebral fissures.
• Structural CNS Damage: Microcephaly, agenesis of the corpus callosum, and cerebellar hypoplasia.
• Neurodevelopmental Impairments: Severe deficits in executive functioning, memory, impulse control, and lifelong learning disabilities.

Substance Use & Non-Judgemental Harm Reduction

Midwives frequently care for women managing illicit substance use (opioids, cocaine, amphetamines, cannabis). The NMC Code requires midwives to deliver compassionate, non-judgmental, trauma-informed care that encourages ongoing engagement rather than driving women away from clinical services.

• Opioid Maintenance vs. Acute Withdrawal: Abrupt opioid detoxification in pregnancy is strictly contraindicated. Acute maternal withdrawal precipitates severe autonomic instability, uterine hypertonicity, placental abruption, premature labour, and fetal demise. The clinical standard is maintenance opioid agonist therapy with methadone or buprenorphine, titrated under specialist addiction supervision.
• Neonatal Abstinence Syndrome (NAS): Neonates exposed to opioids in utero require close observation for NAS (central nervous system irritability, hypertonia, tremors, high-pitched crying, poor feeding, vomiting, tachypnoea). Validated scoring tools (such as the modified Finnegan score) guide supportive care (swaddling, low-stimulus nursery) and pharmacological weaning (oral morphine) when indicated.

Maternal Nutrition, Food Insecurity & Supplementation

Optimal maternal nutrition provides the metabolic building blocks for fetal organogenesis, placental vascularisation, and maternal physiological adaptation.

Body Mass Index (BMI) & Metabolic Risk Stratification

Maternal height and weight must be accurately measured at the initial antenatal booking appointment to calculate Body Mass Index (BMI):

• Underweight (BMI <18.5 kg/m²): Increased risk of fetal growth restriction, low birth weight, and preterm birth.
• Healthy Weight (BMI 18.5–24.9 kg/m²): Standard physiological baseline.
• Overweight (BMI 25.0–29.9 kg/m²): Mildly elevated metabolic risk.
• Obesity Class I (BMI 30.0–34.9 kg/m²), Class II (35.0–39.9 kg/m²), Class III (≥40.0 kg/m²): Maternal obesity carries substantial risks: gestational diabetes, pre-eclampsia, venous thromboembolism (VTE), failed induction, macrosomia, shoulder dystocia, postpartum haemorrhage, wound infection, and unexplained stillbirth.

Midwives advise women that dieting or intentional weight loss during pregnancy is unsafe, as ketosis can impair fetal neurodevelopment. Care focuses on balanced, nutrient-dense nutrition and moderate physical activity.

Food Insecurity & The Healthy Start Scheme

In the context of the cost-of-living crisis, UK midwives routinely encounter food poverty. Midwives sensitively identify nutritional deprivation and signpost eligible low-income families to the NHS Healthy Start scheme. Healthy Start provides a pre-paid digital card for milk, fresh, frozen, and tinned fruit and vegetables, pulses, and infant formula, alongside free vitamins containing folic acid, vitamin C, and vitamin D.

Perinatal Micronutrient Recommendations

NICE guidelines outline clear evidence-based supplementation recommendations for pregnancy and lactation:

                               Perinatal Micronutrient Supplementation
                                                  │
          ┌───────────────────────────────────────┴───────────────────────────────────────┐
          ▼                                                                               ▼
┌────────────────────────────────────────────────────────┐               ┌────────────────────────────────────────────────────────┐
│                      Folic Acid                        │               │                       Vitamin D                        │
├────────────────────────────────────────────────────────┤               ├────────────────────────────────────────────────────────┤
│ • Prevents Neural Tube Defects (NTDs: spina bifida)    │               │ • Supports maternal calcium homeostasis                │
│ • Standard dose: 400 mcg daily (preconception to 12w)  │               │ • Fetal skeletal mineralization                        │
│ • High-risk dose: 5 mg daily (preconception to 12w)    │               │ • Prevents neonatal rickets & hypocalcaemic tetany     │
│   - Maternal BMI ≥ 30 kg/m²                            │               │ • Universal dose: 10 mcg (400 IU) daily throughout     │
│   - Pre-existing maternal diabetes (Type 1 or Type 2)  │               │   pregnancy and lactation for all women                │
│   - Anti-epileptic drug therapy (e.g., carbamazepine)  │               └────────────────────────────────────────────────────────┘
│   - Personal/family history of NTD                     │
│   - Haemoglobinopathies (sickle cell / thalassaemia)   │
└────────────────────────────────────────────────────────┘