What does blood test results of 510 PLT mean?

Platelet count. Based on the limited info in the question, it may mean 510, 000 platelet count if the value is from a CBC or otherwise known as a complete blood count (cbc).
Clotting Factors. This is your platelet count which is the part of the blood that is responsible for clotting and healing wounds. I would probably have it rechecked in a few weeks to make sure it wasn't a lab error and if not you many need additional testing.

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