Screening for Down’s Syndrome

Depending on the type of screening test you had, chemicals in your blood were measured. A measurement of the back of the baby’s neck (nuchal translucency scan) may also have been taken.

To work out the chance of your baby having Down’s syndrome, a computer programme then used:

• your age;
• the results of the blood test;
• the number of weeks you have been pregnant;
• your weight;
• if a ‘combined test’ was used, the nuchal translucency measurement.