Joke Collection Website - Cold jokes - Will disposable blood collection needles in people's hospitals be reused?

Will disposable blood collection needles in people's hospitals be reused?

I don't know if there is something called anticoagulant when the blood vessel is drawn from the factory? This is to prevent blood coagulation before examination. This kind of problem is entirely due to unequal knowledge! A little common sense won't joke about "proteinuria detected in tea", because tea does contain protein.