It does not work that way! I would
demand a blood test asap, and a referral to a hematologist, because polycythemia has about 3 different types. Meanwhile stay hydrated, and take a baby aspirin everyday. Or if you have insurance go to er, get a cbc, and metabolic blood test. Get to a hematologist to see which type he has. Mine is primary, inherited from my mother. There is a cancerous one, with a Jak mutation.
Hope all goes well!