NT is ultrasound scan. It is to scan if baby has down syndrome by measuring the size of clear tissue/ fluid at the back of baby's neck. But accuracy of NT scan is 70+%. Results: An NT of less than 3.5mm is considered normal when your baby measures between 45mm (1.8in) and 84mm (3.3in). So, need to couple other blood test with the NT test to have higher accuracy. Oscar has lower accuracy % compared to Harmony, paranoma, igene blood test. Oscar may have false positive as well.
Kyra