Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Booking assessment and antenatal screening
Obstetrics and gynaecology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Booking can uncover an immediate maternal or pregnancy emergency
Severe hypertension, sepsis, significant bleeding, pain with pregnancy of unknown location, suicidal intent, acute cardiopulmonary symptoms or immediate safeguarding danger cannot wait for routine antenatal follow-up.
Action: Measure observations, establish gestation and pregnancy location where relevant, assess the time-critical problem, and arrange same-day maternity, emergency, mental-health or safeguarding escalation while preserving essential booking information.
Purpose and principles
Complete an early, consent-based booking assessment that identifies maternal, fetal and social risk, offers national screening on time and closes every result pathway.
The booking appointment creates the initial pregnancy care plan, not merely a panel of blood tests. NICE recommends completion by 10+0 weeks so that risk reduction, infectious-disease treatment, haemoglobinopathy partner testing and fetal screening remain timely. If contact is late, arrange booking within 2 weeks where possible and ask sensitively why access was delayed. Transport, language, insecure immigration status, homelessness, violence, learning disability, caring responsibilities and fear of services may require practical support rather than a label of non-engagement.
Begin with the person's priorities and confirm gestation from the last menstrual period, cycle pattern, assisted conception and any earlier ultrasound. Record previous pregnancies in enough detail to alter care: gestational age and mode of each birth, pre-eclampsia, gestational diabetes, growth restriction, stillbirth, preterm birth, postpartum haemorrhage, thrombosis, neonatal disease and previous caesarean or uterine surgery. Ask about genetic diagnoses and consanguinity without assumptions. Multiple pregnancy, uncertain viability or pain and bleeding leads to an appropriate ultrasound pathway rather than routine dating alone.
Indications, selection and cautions
Timely booking
A first appointment by 10+0 weeks leaves time for prevention, early screening, partner testing and informed diagnostic choices.
Higher-risk pregnancy
Medical disease, previous obstetric complication, multiple pregnancy, significant antibody, mental illness or complex social need changes the routine appointment plan.
Informed screening decision
The patient understands what each offered test can and cannot show, likely next steps and that acceptance is voluntary.
Access barrier
Late booking, repeated missed contact or absent results may reflect coercion, poverty, language need, disability, migration or fragmented records rather than refusal.
Result requiring action
Positive infection screening, maternal haemoglobinopathy carrier status, clinically significant antibody or marked anaemia needs a named pathway and confirmed handover.
Red flags requiring action
Sustained blood pressure of 160/110 mmHg or higher requires urgent same-day secondary-care assessment based on the complete clinical picture.
Pain, bleeding, syncope, shoulder-tip pain or peritonism before pregnancy location is known requires urgent early-pregnancy assessment.
Fever, rigors, respiratory compromise, confusion or haemodynamic abnormality suggests infection or another acute illness that supersedes routine screening.
Method and interpretation
01Full blood countFirst step
Why
Identify anaemia, abnormal red-cell indices and thrombocytopenia early enough for investigation and treatment.
Interpretation and limitations
Low haemoglobin needs cause-directed assessment; microcytosis may reflect iron deficiency or haemoglobinopathy, and platelet abnormality can alter obstetric and anaesthetic planning.
02ABO, RhD and red-cell antibody screen
Why
Prepare safe transfusion care and identify pregnancies at risk of alloimmune fetal anaemia.
Interpretation and limitations
RhD-negative status informs prophylaxis only when anti-D is not already immune; any significant antibody requires identification and an antigen- and history-based plan.
03HIV, syphilis and hepatitis B screening
Why
Detect treatable maternal infection and initiate measures that reduce transmission to the fetus or newborn.
Interpretation and limitations
A reactive screen needs programme confirmation and urgent specialist linkage; a negative result can be reoffered later if subsequent exposure occurs.
04Sickle cell and thalassaemia screen
Why
Identify maternal carrier or disease status and determine whether the fetus could inherit a major haemoglobin disorder.
Interpretation and limitations
A carrier result triggers biological-father testing and counselling; if both are carriers or the father is unavailable, prenatal diagnosis can be offered.
Clinical next steps
01BookingBuild the pregnancy risk and care planFirst stepA person first enters maternity care, whether early or after the usual booking window.+
1Confirm gestation, history, medicines, allergies and prior obstetric outcomes, then measure BMI, blood pressure and urine protein with consent.
2Assess VTE, pre-eclampsia, diabetes, fetal-growth, inherited-condition, mental-health and social risks and allocate each positive finding to a named pathway.
3Agree the routine or enhanced appointment schedule, communicate urgent contact routes and share relevant information with primary and specialist care after discussion.
02Screening offerSupport separate informed choicesNational antenatal screening tests are due or were not completed at the expected time.+
1Explain infectious-disease, haemoglobinopathy and fetal screening independently, including purpose, limitations, possible results and any time-sensitive downstream decision.
Risks, monitoring and follow-up
Use an antenatal screening failsafe to match every accepted test with a result, communication record and completed downstream action.
Review general wellbeing, new concerns, domestic circumstances and the pregnancy care plan at every contact rather than treating booking risk as fixed.
Measure blood pressure at face-to-face appointments and offer urine dipstick testing for proteinuria at every routine face-to-face antenatal visit.
Track anaemia treatment, urine-culture clearance, infection specialist attendance, antibody surveillance and partner haemoglobinopathy testing where relevant.
Follow up non-attendance using the agreed safe contact method and assess practical or safeguarding barriers before closing a referral.
Update maternity records with history, results, medicines, examinations and decisions at each contact so that triage and intrapartum teams see the current plan.
Special situations
Ten weeks is clinically useful
Early booking preserves options for haemoglobinopathy partner testing, trisomy screening and preventive medicines that cannot simply be recreated later.
One blood draw contains choices
Samples may be collected together, but HIV, syphilis, hepatitis B and haemoglobinopathy screening remain distinct offers that can be accepted separately.
Screening estimates rather than certifies
A lower-chance result reduces probability but cannot exclude every affected pregnancy, while a higher-chance result still requires diagnostic interpretation.
Late access carries information
The reason for delayed booking may reveal abuse, unstable housing, migration, mental illness or prior poor care and should shape support.
Risk assessment is longitudinal
A normal booking assessment does not prevent later hypertension, infection, mental-health change or safeguarding disclosure, so each visit must reopen relevant questions.
Common pitfalls
01
Treating booking as complete once bloods are taken even though history, consent, risk assessment and result follow-up remain unfinished.
02
Using a partner or relative as interpreter during mental-health, substance-use or domestic-abuse enquiry.
03
Presenting antenatal screening as compulsory or bundling all tests into a single consent decision.
04
Assuming a negative urine dipstick excludes asymptomatic bacteriuria instead of sending the recommended culture.
05
Ignoring a late or missed appointment without exploring access barriers and ensuring a safe rebooking route.
06
Recording a positive screen without confirming that counselling, diagnostic testing or specialist treatment actually occurred.
Practice
Two practice questions
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Question 1 of 2
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Obstetrics and gynaecologyOriginal SBA
Timing the booking appointment
A healthy nulliparous patient self-refers to maternity services at 7+4 weeks and asks when the first antenatal booking appointment should occur. Which target is correct?
Sources and review status6 sources · checked 27 Aug 2026 · clinical review pending+
Sources
Sources and review status
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.
Medical assessment covers cardiovascular, renal, endocrine, haematological, neurological, autoimmune, infectious and psychiatric history. Reconcile prescribed and non-prescribed medicines, allergies and adverse reactions. Ask about venous thromboembolism and family history, then use the local validated pregnancy VTE tool. Assess pre-eclampsia and gestational-diabetes criteria, including BMI and previous outcomes, and identify who needs aspirin, an oral glucose tolerance test, specialist review or additional fetal surveillance. Dental, occupational and vaccination history can expose practical prevention needs.
The first examination is purposeful. Measure height and weight to calculate booking BMI, use a pregnancy-validated device for blood pressure, and test urine for protein. Severe hypertension needs same-day referral; lesser elevation requires confirmation and a hypertension pathway. Full blood count detects anaemia and thrombocytopenia, while ABO, RhD and antibody testing guide transfusion and HDFN prevention. A urine culture detects asymptomatic bacteriuria. Routine pelvic or breast examination is not a universal booking requirement; examine when symptoms or history make findings useful and obtain specific consent.
In England, offer the national infectious diseases in pregnancy screen for HIV, syphilis and hepatitis B. Positive results activate specialist pathways that can protect maternal health and markedly reduce vertical transmission, so the result cannot sit unacknowledged in an inbox. Screen for sickle cell and thalassaemia early, ideally with the maternal result available by 10 weeks. All pregnant women are offered thalassaemia screening; sickle-cell testing uses the programme's high- or low-prevalence algorithm. When the pregnant person is a carrier, offer the biological father timely testing and genetic counselling without coercion.
Fetal screening decisions are separate. Offer the 11+2 to 14+1 week scan for dating, plurality and, if chosen, combined trisomy screening, followed by the 18+0 to 20+6 week anomaly scan. Explain that screening estimates chance or looks for selected conditions and cannot show that a fetus is unaffected by every disorder. A person can choose different parts, change their mind within programme limits, or decline; the role of the clinician is to make the options, consequences and deadlines understandable in a preferred format.
Psychosocial history is clinical information. Ask privately about domestic abuse, coercive control, sexual safety, FGM, housing, food security, migration, work hazards, smoking, alcohol and drug use. Ask about current mood, anxiety, severe mental illness, previous puerperal psychosis, self-harm and support. Establish safe contact details and interpreter needs. Consent and confidentiality should be explained, including the circumstances in which serious risk to the patient, a child or another person may require proportionate information sharing.
Close booking with named actions. Give the expected appointment and scan timetable, maternity triage contact and urgent symptom advice. Record accepted and declined screening components, sample dates, missing tests and referral owners. Nulliparous pregnancies usually have 10 routine appointments and parous pregnancies 7, but this is a minimum framework rather than a cap. Continuity, accessible information and active follow-up of missed contacts are safety interventions because risk and circumstances change throughout pregnancy.
Key points
Offer the first antenatal booking appointment by 10+0 weeks; when referral occurs after 9+0 weeks, offer an appointment within 2 weeks if possible.
Plan 10 routine antenatal appointments for a nulliparous pregnancy and 7 for a parous pregnancy, adding or lengthening contacts for clinical, communication, social or emotional need.
At the first face-to-face contact record height, weight and BMI, blood pressure, urine protein, full blood count, ABO group, RhD type and red-cell antibody status.
Offer, after information and consent, screening for HIV, syphilis and hepatitis B, sickle cell and thalassaemia, trisomies and the 20-week fetal anomaly programme; each component can be accepted or declined.
Obtain a midstream urine culture early because asymptomatic bacteriuria is not reliably excluded by symptoms or dipstick alone and treatment reduces pregnancy complications.
Use structured history to assess previous obstetric outcomes, medical and mental-health conditions, medicines, VTE, pre-eclampsia, diabetes, fetal-growth and inherited-disease risk.
Arrange a private one-to-one discussion for domestic abuse, safeguarding, substance use, FGM and mental health; never use a partner or family member as the interpreter for sensitive enquiry.
Screening is a choice and not a guarantee: explain possible results, follow-on tests and time limits, record decisions and run a failsafe until every accepted test has a documented outcome.
Active suicidal thoughts, psychosis, mania, severe self-neglect or abrupt withdrawal from dependence-forming substances needs immediate specialist evaluation.
Disclosure of current violence, strangulation, sexual assault, coercive control or danger to a child requires private safety assessment and local safeguarding action.
Known major red-cell antibodies, a previous severely affected pregnancy or a serious inherited condition in either parent warrants early specialist referral rather than waiting for standard result review.
05Midstream urine culture
Why
Detect asymptomatic bacteriuria at booking before pyelonephritis and adverse pregnancy outcomes develop.
Interpretation and limitations
Significant growth should be treated with a pregnancy-appropriate antibiotic and followed according to susceptibility and local pathway; a dipstick alone is inadequate screening.
06Blood pressure and urine protein
Why
Establish a baseline and detect chronic or early pregnancy hypertension and renal disease.
Interpretation and limitations
A sustained reading at or above 160/110 mmHg requires same-day referral; lesser abnormal findings need repeat measurement and diagnostic assessment.
2Provide accessible information and a professional interpreter where required, then record acceptance or decline for each programme component without pressure.
3Take accepted samples promptly, arrange the correct scan window and set a failsafe for results, repeats, partner tests and specialist referrals.
03AbnormalityClose the loop on every resultA test is positive, equivocal, missing, taken late or incompatible with the history.+
1Contact the patient safely, confirm what the result means and assess whether there is an immediate maternal, fetal or safeguarding risk.
2ConfirmatoryActivate the programme-specific confirmatory or treatment pathway, including infection specialist, haematology, fetal medicine or genetic counselling as indicated.
3Document ownership and completion, update the care plan and ensure a declined or unavailable component can be revisited while it remains clinically useful.