Panorama test came back with no results

Did a Panorama test 2 weeks ago and was told that the lab came back with no results. Clinic told me not to be worried about it and requested for me to take another blood test, this time round for Harmony. Has anybody had a similar experience as me? Why did the clinic not do a blood test redraw for the Panorama again but to switch for a test under Harmony instead? Is a no result under Panorama a room for concern?