My brief medical history includes: quintuple heart by-pass 17 years ago; lung cancer and removal of 2/3 of right lung 9 years ago; and type II diabetic since 2009. Although I have no other issues, I am concerned about low blood platelets. I understand that the normal range of blood platelets is 140,000 to 180,000. For the last five+ years, my numbers have been steady at 85,000 to 105,000, way below the normal range. I have talked with my hematologist who is not overly concerned. Should I be concerned?