The screening check for Down's syndrome used at this time of pregnancy is known as the "put together exam". It requires a blood test and measuring the fluid in the back of the newborn's neck (nuchal translucency) by having an ultrasound scan. This is usually termed a nuchal translucency scan. http://pregnancyguide21960.dailyblogzz.com/2012967/not-known-details-about-what-to-expect