Question: I am a 37 y/o male, 6’2” and 190 lbs. No major health history other than slight hypertension, tension headaches and anxiety. Daily medications include amlodipine 5mg and multivitamin. I work a sedentary job but have exercised daily (aerobic) for years.
About 2 weeks ago I started feeling very exhausted and short of breath. I often felt warm and like my heart was racing. I went to a clinic and found my heart seemed fine (EKG was normal), but upon bloodwork found my T3 and T4 were both high, TSH was less than 0.01. Additionally my platelets were higher than normal at 370 (for 10 years my platelets have not varied out of the 220-290 range) and hemoglobin was low at 12.5.The doctor referred me to an endocrinologist, but that appointment is still a week out. I had repeat blood work yesterday and T4 was still high 14.5 (normal range 4.0-11.0), T3 was not tested and platelets are now 399.
I have no history of thyroid problems and annual TSH tests have all been normal

Questions:
-How likely is it that the rise in platelets is connect to the recent hyperthyroidism?
-What are your thoughts as to the cause?
-Would you make other recommendations?

Doctor,

Thank you for your response. Your comment about hyperthyroid and platelets count being connected gives me some relief. I have been a bit anxious about the platelets because the little searching I read seemed to associated increased platelets more with hypo thyroid.

In your opinion, is it unusual/concerning that if the thyroid hormones are speeding up bone marrow production that only platelets are increased and not other elements, such as red/white blood cells?

Thank you again for the explanation. I hope to learn more next week about the exact cause and treatment options.