Antenatal Care & the Antenatal Clinic
What is Antenatal Care?
Antenatal care is the programme of appointments, tests and health guidance offered to pregnant women from early in their pregnancy until they go into labour. In the UK, care is co-ordinated by the NHS and is free of charge. The goals of antenatal care are to monitor the health of both mother and baby, identify and manage any complications as early as possible, prepare parents for labour and birth, and provide emotional support and health education. Women are encouraged to register with their midwife or GP as soon as they believe they are pregnant, ideally before 10 weeks, to ensure they receive the full schedule of appointments and first-trimester screening.
The Booking Appointment
The first formal antenatal appointment is known as the booking appointment and ideally takes place between 8 and 10 weeks of pregnancy. It is usually conducted by a midwife and typically lasts an hour or more. At the booking appointment, the midwife will: take a full medical history (including any previous pregnancies, chronic conditions and current medications); check the woman's blood pressure; test a urine sample for protein (which can indicate pre-eclampsia or infection), glucose (to screen for gestational diabetes) and bacteria; take blood to determine blood group, rhesus factor, haemoglobin level (to detect anaemia), and to screen for conditions including HIV, syphilis, hepatitis B and rubella immunity; calculate the due date (estimated date of delivery) from the last menstrual period; and discuss lifestyle factors including diet, exercise, smoking and alcohol.
At subsequent routine appointments, the same checks — blood pressure, urine, and from 24 weeks onwards, fundal height (measuring the growth of the uterus with a tape measure) — are repeated at every visit to track progress and detect any changes. From around 28 weeks, the midwife will also feel the baby's position (palpation) and check the foetal heartbeat using a handheld Doppler device.
Blood pressure is monitored at every antenatal appointment because raised blood pressure (hypertension) in pregnancy can indicate pre-eclampsia — a serious condition that, if untreated, can restrict the baby's growth, cause organ failure in the mother, and become life-threatening. Early detection allows treatment to begin before the condition becomes dangerous.
The Antenatal Healthcare Team
Several healthcare professionals may be involved in a woman's antenatal care, depending on whether her pregnancy is low-risk or requires specialist input. The midwife is the lead professional for most low-risk pregnancies, providing continuity of care from booking through to the postnatal period. The GP (general practitioner) often refers women for antenatal care, manages any ongoing medical conditions during pregnancy, and may carry out some routine appointments. The obstetrician is a hospital-based consultant who takes over or shares care when pregnancies are classified as high-risk — for example, if the mother has diabetes, high blood pressure, a multiple pregnancy (twins or more) or a history of complications. Other professionals involved can include the anaesthetist (for epidurals or caesarean sections), a diabetic specialist midwife (for gestational diabetes), a physiotherapist (for pelvic girdle pain) and, where relevant, neonatologists who specialise in the care of premature or sick newborns.
Ultrasound uses high-frequency sound waves to create images of the developing baby inside the womb without using radiation. In the UK, two routine scans are offered to all pregnant women. The dating scan (also called the 11-13 week scan) confirms the pregnancy is in the uterus, accurately establishes the due date, checks for a heartbeat and can detect multiple pregnancies. As part of this scan, the nuchal translucency measurement — the thickness of the fluid-filled space at the back of the baby's neck — is taken and combined with blood test results to calculate the statistical risk of chromosomal conditions such as Down's syndrome, Edwards' syndrome and Patau's syndrome. This is a screening test, not a diagnostic one: a high-risk result does not confirm a condition but indicates that a diagnostic test should be offered. The anomaly scan at around 20 weeks checks the baby's physical development in detail, looking at the brain, heart, kidneys, spine, face, limbs and placenta position, and can identify structural abnormalities such as spina bifida or heart defects.
Diagnostic Tests: Amniocentesis and CVS
Where screening tests indicate a higher risk of a chromosomal or genetic condition, diagnostic tests can be offered to give a definitive answer. Amniocentesis is carried out from around 15 weeks. Under ultrasound guidance, a fine needle is passed through the mother's abdomen to draw a small amount of amniotic fluid, which contains foetal cells. The cells are cultured and the chromosomes examined. Results typically take one to three weeks. Chorionic villus sampling (CVS) is an alternative performed earlier (10-13 weeks), in which a small sample of placental tissue is taken; it carries a similar or marginally higher miscarriage risk to amniocentesis — approximately 0.5% (1 in 200) for both procedures when performed by a skilled operator, according to current NHS and RCOG guidance — but provides results more quickly.
Both amniocentesis and CVS are offered (not required) to women who receive a high-risk screening result, who are over 35, or who have a known family history of a chromosomal or genetic condition. Because both carry a small risk of miscarriage, the decision to accept or decline a diagnostic test is a personal one that midwives and genetic counsellors support without pressure. A positive result gives parents certainty about the baby's condition and allows them to prepare, seek further specialist care, or make decisions about the pregnancy.
Amniocentesis is a diagnostic test carried out from around 15 weeks of pregnancy. A fine needle is used to withdraw a small sample of amniotic fluid containing foetal cells, which are tested for chromosomal conditions such as Down's syndrome. It carries an approximate miscarriage risk of up to 0.5% (1 in 200) according to current NHS guidance, and provides a definitive result, unlike screening tests which only indicate risk level.
A screening test (e.g. the nuchal translucency scan and combined blood test) gives a risk level — for example ‘1 in 50 risk of Down's syndrome’ — but cannot confirm whether the baby has the condition. A diagnostic test (amniocentesis or CVS) analyses the baby's own cells and gives a definitive result. In exam answers, never say a screening test ‘confirms’ or ‘diagnoses’ a condition — this is inaccurate and will cost marks. Use the word ‘indicates’ or ‘estimates the risk’ for screening, and ‘confirms’ only for diagnostic tests.