Mayo Clinic Q and A: What causes a high platelet count?

DEAR MAYO CLINIC: I am 33 years old and recently had an annual physical and routine blood work. I'm active with two children and feel fantastic, but my platelet count came back as 651. My health care professional said it could indicate a blood cancer and referred me to a hematologist. What can cause my platelets to be so high? I'm nervous, as my only prior medical problem was iron deficiency anemia. ANSWER: Being told you might…
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