Is there a blood test that can detect excessive inflammation in the body in more than one area at a time with one test?

Yes .....: When we suspect inflammation we common check two tests: ESR (erythrocyte sedimentation rate) or CRP (C-reactive protein). They are quite sensitive and are often elevated in infection or systemic inflammation. But the problem is they are not specific: they don't tell you where the inflammation is or what condition is causing it. In reality, they have limited utility. Stay well:)

Why do you ask?: I'm a pathologist and specialist in lab medicine. The sed rate and C-reactive protein rise when there some serious inflammation over a few weeks, and in some other situations, but by this time it'll be symptomatic and you'll know something's wrong. Is someone trying to sell you something? There's no substitute for a good history and physical exam