Antenatal screening bloods overview
Informed by recognized medical guidance
Overview
Antenatal screening bloods are a routine set of blood tests offered to all pregnant women early in pregnancy. They check for conditions that could affect the health of the mother or baby, so that any problems can be managed early.
Key facts
- The tests are usually done at your first antenatal appointment (booking appointment).
- They are optional – you can choose to have all, some, or none of them.
- The results help guide further tests, vaccinations, or treatments during pregnancy.
- Screening bloods can detect infections, blood group issues, inherited disorders, and risk of some birth defects.
Yes, antenatal screening bloods are a standard part of pregnancy care in many countries, including the UK.
All pregnant women are offered these tests. They are especially important for women who may have a higher risk of certain conditions, such as sickle cell disease or thalassaemia.
Symptoms
- Heavy bleeding (like a period) during pregnancy
- Severe abdominal pain
- Sudden severe headache with blurred vision (possible pre-eclampsia)
- ⚠Vaginal bleeding any time in pregnancy
- ⚠Fever or chills
- ⚠Reduced baby movements after 24 weeks
Common symptoms
- Antenatal screening bloods themselves do not cause symptoms. They are done even if you feel healthy.
Causes
Risk factors
- Being from an ethnic background with higher risk of inherited blood disorders (e.g., African, Caribbean, Mediterranean, South Asian)
- Previous pregnancy affected by a condition the tests screen for
- Age over 35 (higher chance of chromosomal conditions like Down's syndrome)
- Not having had rubella (German measles) vaccination
When to see a doctor
See a doctor urgently if:
- If you have heavy bleeding, severe pain, or symptoms of pre-eclampsia (severe headache, vision changes, vomiting).
Book a routine appointment if:
- Attend all your antenatal appointments as scheduled – the screening bloods are usually taken at your first appointment, ideally before 10 weeks.
Diagnosis
Antenatal screening bloods are not used to diagnose conditions – they screen for risk. If a screening test suggests a higher chance of a condition, you will be offered a diagnostic test (like amniocentesis) to confirm.
Tests that may be done
- Blood group and Rhesus (Rh) status
- Full blood count (checks for anaemia)
- Rubella (German measles) immunity
- Hepatitis B
- Syphilis
- Sickle cell and thalassaemia screening
- Combined test (for Down's syndrome, Edwards' syndrome, Patau's syndrome) – includes nuchal translucency scan and blood test
What to expect at your appointment
A small amount of blood is taken from your arm using a needle. It takes just a few minutes. Results may take a few days to a week. Your midwife or doctor will tell you when and how you'll get the results.
Treatment
Treatment depends on the findings of the screening. No condition is treated directly by the blood test itself – the results inform further care.
Self-care at home
- Take folic acid as recommended before and during early pregnancy.
- Eat a healthy balanced diet.
- Attend all antenatal appointments.
Medical treatments
If a medical condition is found, your healthcare team will explain your options. For example, if you are Rhesus negative, you may be offered an injection to prevent complications. If an infection like HIV is detected, treatments can greatly reduce the chance of passing it to your baby. For inherited disorders, genetic counselling and further tests are offered.
When is surgery considered?
Surgery is not related to these blood tests. If a serious fetal condition is diagnosed, you may be offered further interventions or support.
Living with this condition
Antenatal screening bloods are a once-off set of tests. After they are done, you continue your usual pregnancy care. If results show something concerning, your team will support you every step of the way.
Lifestyle tips
- Maintain a healthy diet rich in iron and folate.
- Stay active with gentle exercise like walking or swimming.
- Get plenty of rest and manage stress.
Diet and exercise
You do not need to change your diet or exercise specifically for these blood tests. However, a healthy lifestyle supports a healthy pregnancy overall.
Mental health and emotional wellbeing
Waiting for results can be worrying. It is normal to feel anxious. Talk to your midwife or doctor about any fears. They can explain what the results mean and what the next steps are.
Prevention
Antenatal screening bloods cannot prevent conditions, but they can identify risks early so that steps can be taken to protect you and your baby. For example, knowing your rubella status allows vaccination after pregnancy.
Vaccines
Some vaccines are offered during pregnancy (like flu and whooping cough) but are separate from the screening bloods. If you are not immune to rubella, you will be offered the MMR vaccine after birth.
Screening programmes
These very blood tests are a form of screening. They are offered to all pregnant women to identify potential health issues.
Complications
If left untreated
- Undetected infections (like HIV or hepatitis B) could be passed to the baby during pregnancy or birth.
- Undiagnosed anaemia can cause fatigue and increase risk of complications.
- Rhesus incompatibility (if mother is Rh negative and baby is Rh positive) can lead to severe jaundice or anaemia in the newborn.
- Delaying diagnosis of inherited blood disorders can affect the baby's health.
Long-term outlook
Most screening results are reassuring. When problems are found, effective treatments and monitoring are available. With good antenatal care, the outlook for both mother and baby is very positive.
Find support
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Related conditions
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 19, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.