Last nine blood test readings
Two units of blood transfused September 10 and 11 returned Hb to over 100, and platelets are comfortably within the normal range. However, with hydroxycarbamide three times a week, Hb could be expected to fall back to the low 80s by the time of the next haematology appointment on October 21, so that two units of blood would be needed from now on every eight weeks if the underlying conditions remain the same. It looked as though something had changed after July 3, when Hb had been stable for 7 tests but then dropped steeply before the next reading on September 10. But there is evidently no algorithm for calculating what the hydroxycarbamide dose should be to optimise the levels of Hb and Plt.