Manal, by the way, for Hb Knossos, I have understood it being a HB Beta Variant, so is HB-E.
HB-E Variant is common in South East Asia. My wife's HB Electropherisis shows that she has normal HBA2, HBF. As for HB A, I think a 29% is reclassified as HB-E. As a result, she is classified as being heterogygous of HB-E. For Homogygous HB-E, the percentage of HB-E will be much higher. ( I have also understood that Homogygous of HB-E, ie both beta gene is of HB-E variant is not a serious situation and that the person will be prety much without symptons ). HBA2 would not be able to diagnoses this E variant. Similarly, the MCV & MCH will only be mildly decreased. My wife's MCV & MCH are 72 & 25 respectively. Her Hb level is at a healthy 13.2. Haemotocrit 38.
I thought the same situation is true for HB-Knossos whereby the HBA2 is supposed to be in the normal range. Out of the % of HB A, a large percentage will be reclassified as HB-Knossos. This is just my understanding from reading those articles churned out by the fantastic GOOGLE search. I hpoe I have not understood wrongly though.