I took a early cdt lung blood tests and the p53 autoantibody was the only one slightly elevated what does that mean? have i got lung cancer?

Nobody knows: These are experimental and nobody knows what various levels mean. These markers are infamous for false positives and I would not get this test on a fishing expedition even if it were free. Without a lung lesion visible on imaging, this information is useless. If you feel well and are not losing weight of coughing up blood, be thankful and forget about it.