It is not. Nor is joking around with your own medical condition and telling this room you are simultaneously gravely ill and doing nothing about it.
The doctor's exam may require no blood taken at all, and may be diagnosed with multiple other factors and given straightforward medication to resolve the issue.
(In fact in my country it would require no blood taken at all, because doctors surgeries do not take blood. They give you a referral to do that separately.)
