Is it possible for a lab to mess ur blood test wrong I had positive 666.5 ANA but doc said lab measured wrong but ENA was positive what is ENA for?

Possible. Clerical errors that lead to mixing of patient samples, although uncommon, are still the leading cause of errors in modern labs. If there is any doubt, have it repeated. Make sure the tubes are labeled in your presence and signed by the phlebotomist.