The BOLT test, a simple method to assess breathing efficiency, measures how long one can comfortably hold their breath, ...

The BOLT test is a simple method to assess breathing efficiency, as it measures how long you can comfortably hold your breath ...

These are levels that we never would've even imagined before COVID," Cardillo said. Once a person's oxygen saturation levels dip below 90%, he says that's when doctors get worried and will ...