Sickle Cell Screening in Pregnancy
How sickle cell and thalassaemia screening works in UK pregnancy, who is offered it, and what carrier status means for your baby.
Table of Contents
How Sickle Cell Screening Works
Sickle cell disease and thalassaemia are inherited blood conditions that affect haemoglobin. In the UK, all pregnant people are offered a blood test for sickle cell and thalassaemia at the booking appointment. In areas where these conditions are more common the test is routine for everyone; in low-prevalence areas it may be offered based on family origin questionnaire results. The test checks whether you are a carrier, also called having a trait. Being a carrier does not mean you have the disease, but it means you could pass the gene to your baby.
What Happens If You Are a Carrier
If your blood test shows you are a sickle cell or thalassaemia carrier, the next step is to test the other biological parent. If only one of you is a carrier, your baby may be a carrier but is very unlikely to have the full disease. If both of you are carriers, each baby has a one in four chance of having the condition. In that case you will be offered genetic counselling and prenatal diagnostic testing, such as CVS or amniocentesis, to find out whether the baby is affected. Early screening means planning can begin before birth.
Frequently Asked Questions
Is sickle cell screening mandatory?
No, it is offered to all pregnant people in the UK but you can decline. Because carrier status has no symptoms, screening is the only way to know whether your baby could be affected.
Does being a sickle cell carrier make me ill?
Carriers (sickle cell trait) are generally healthy and do not have sickle cell disease. In rare situations, such as extreme dehydration or low oxygen, carriers may experience symptoms, but day-to-day life is unaffected.
Can sickle cell disease be detected on the 20-week scan?
No, sickle cell disease is a genetic condition and cannot be seen on ultrasound. It is diagnosed through blood tests of the parents and, if needed, CVS or amniocentesis during pregnancy.
This information is for educational purposes only and is not a substitute for professional medical advice. Always consult your midwife, GP, or obstetrician about your individual results and care plan.
Further reading:
Related articles: Early Pregnancy Blood Tests | hCG Levels Explained | Anaemia in Pregnancy