Under a new federal directive, commercial labs are required to give patients copies of their laboratory ... have their blood drawn early the next morning might have out-of-range ­results.

If you have results from a recent blood test handy, please follow along. Depending on the lab that analyzed your sample, the ...

from blood to sodium. Too much or too little of anything can lead to problems. If your test results fall within the normal range, doctors assume you’re in overall good health. Gradual changes ...