Is blood platelet count of 500 normal?

500000, right? This is higher than most folks, but "normal" here is a curious idea -- lab reference ranges are set so that several percent of healthy folks fall a little bit outside on either end. If you're iron-deficient, that would be the obvious explanation, even if you're not significantly anemic. If not it's something to follow, or your physician may want to do a gene test for essential thrombocythemia.