Hi, I've had the harmony test at 10+3week (ivf preg)..got low risk result thankfully. I did notice that my fetal fraction was just stated as 5pc (even number!). I have a nagging concern that that is quite close to the cut off which i think is 4pc. Is a low percentage unusual or affecting accuracy. I'm 39 and have had scans including at 12 weeks. I asked doc about NT at this stage and she said the harmony overrode NT(i hadn't seen FF result at this stage). She mentioned that she could see it and it looked normal /thin- she didn't measure. Any insights from anyone on fetal fraction?