Worried about slightly elevated platelet count
My platelets have been at the high end of normal (394 to 399) since 2016. A few weeks ago, they were 401. The doctor retested two weeks later and they were 404. How concerned should I be about these numbers? Can some people just run on the higher side? I don't appear to be anemic. Autoimmune diseases run in my family and I have Hashimoto's that is controlled with levothyroxine. Multiple tests for inflammation came back normal. The only other abnormal result is a slightly low RDW (11.8%). Recent colonoscopy, endoscopy, and mammogram were all normal. I'm 54 years old and otherwise healthy and active. My doctor suggested the JAK2 test, which really scared me. Does this seem premature? Can stress lead to platelet levels as high as mine? I would greatly appreciate any suggestions anyone can offer. Thank you!