Hi,
For normal adult males 16 g/dl is quite safe, but since Thals. require continuous transfusion, then the transfusions at high HB levels and less interval between them ( to maintain the high level ), will eventually result in higher iron overload. So increase the transfusion interval by one week if you are getting high HB after every transfusion. That will make a difference of one whole transfusion afer 2-3 transfusions depending on your 2-3 week interval recomeneded by your doctor.
Oh yes, ask your doctor before changing the interval because this surge in HB could also be temporary as somtimes the donor's blood is much healthy and fresher and may result in high HB. This fact has been discussed in other posts that you can get better HB from fresh blood than the older one.