Serum Screening Tests Explained
Most babies develop normally, but unfortunately about 2% have a significant abnormality. Screening tests inform you of the chance that your baby could be born with a problem. It is important that you have decided wether you would want further tests such as amniocentesis if the screening test is positive. However, agreeing to a screening test does not mean you have decided to have a termination if a problem is found. Some couples simply prefer to know in order to be prepared, whilst others may choose to terminate their pregnancy. If a problem is found, you will be offered additional support and counselling to be aware of all your options.
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Neural Tube Defects e.g. Spina Bifida An opening anywhere along the length of the baby's spine can result in paralysis of the lower limbs or a collection of water on the brain (hydrocephalus). An important warning sign is raised AFP (alphafetoprotein), measured in your blood. The best diagnostic test is detailed ultrasound scan.
Down's Syndrome Babies with this condition have an extra chromosome 21, and are at increased risk of heart and bowel problems and learning disabilities. The overall risk increases for older mothers. The 'double blood test' - measures 'serum markers' and using other factors it can be worked out if your chance of having a baby with Down's Syndrome is increased.
