I've been around shooters,, ranges,, handloading etc all my life.
I've seen some people test high,, and others very low.
One thing NOT mentioned is the fact that each person is a physically different being.
No (2) people will get the exact same results. A lab test isn't expensive, as compared to the alternative. When in doubt,, do the test. And if a doctor says not to,, ask them if they will sign a liability form stating they advised against it. Bet they will test ya then!
You can't buy good health,, and as such,, many things are tried & proven methods of preventing poor health. A lead level test is one of those. I think of it as cheap insurance.
Everybody who shoots may have different factors to consider. Indoors or outdoors? Good indoor ventilation or bad? Lead bullets or jacketed? Handloads or factory? Jobs associated with lead or not?
Too many variables to consider,, and as such, a simple test is an easy way to get a good idea of each person's health where lead is concerned.