Can a doctor tell if i have a chest infection just by a blood test and auscillation?thanks

Doctor's skills: In the ideal world-a doctor should be able to diagnose your medical problems with ease. Talking to the patient, I've found, is extremely helpful in formulating the diagnosis. Then, physical examination is used to 'back up' what's suspected from the history. Finally lab testing (a blood draw, X-ray, etc) confirms the disease under consideration. The therapy follows naturally from that. Ask MD if Qs