So.... I saw the haem today and she confirmed the diagnosis of ET. I had a BMB 3 weeks ago and have been having weekly blood tests as well as being on HU for about 8 weeks now. Started on 500mg twice a week, went up to 500mg 4 times a week, then 500mg daily - today has been increased to 1000mg 4 days a week and 500mg 3 days. Platelet levels are now almost 1900 so I am hoping the increase will start a reduction, because so far they have continued to rise every week. All other counts are good and no sign of any secondary issues (I had breast cancer 13 years ago so had some concerns there). No side effects from the HU so far. Thank you all for your welcome after my first post a few days ago and I will continue checking in for further information. A question ... how high can platelets actually go? Mine seem to be horrendous compared to posts I have read but my haem didn't seem overly worried.