I have just completed my first trimester screening test. The scan was normal. NT was 1.7mm. However the biochemistry test markers indicate an increased risk for Downs Syndrome. Is it normal to have contradictory results like this. I was under the impression that an increased risk would show up in the scan as well as the blood test
An increased risk in biochemical tests with normal NT can be seen. You simply have to go for a detailed anomaly scan at 20 weeks with 2 and trimester blood tests for screening. If NT and 1st trimester tests both are positive then there is 80% risk of downs however if NT is normal, the risk is significantly low. So go for 2 and trimester testing and anomaly scan for purity