Both Oscar and Harmony/Panorama will not just indicate High/Low risk but with a ratio for 3 trisomies.
Oscar yields a lower accuracy as it takes a few factor including maternal's age into consideration, hence might not be favourable for mummies at a higher age. While for Harmony/Panorama, it takes the blood specimen from mother which consist fetus's blood as well. Harmony/Panorama yields a higher accuracy but still, neither Oscar nor Harmony/Panorama is diagnostic method.
You may wish to do some research prior to your test date to have a better understanding between these 2/3.[/QUOTEthank you! I am doing some research now