The phrase "noninvasive method" means a way of examining or treating the body that does not require any cutting, puncturing, or invasive procedures. Full definition
Bioelectric Impedence Analysis is a cheaper, quicker, noninvasive method for measuring muscle, but its reliability varies with an individual's hydration status, ethnicity, physical fitness, and age. (philmaffetone.com)
More generally, she hopes to demonstrate the archaeological value of using noninvasive methods like lidar and high - resolution photography to explore sensitive areas — techniques that could be used at sites as diverse as the killing fields in Cambodia and World War II — era shooting trenches in Eastern Europe. (scientificamerican.com)