@A.Fulcrum It's a good test because if you don't experience extreme shortness of breath or coughing after holding your breath for an extended period, it means that your lungs are currently functioning properly since that deep breath before holding means they've absorbed enough oxygen to sustain you during a period of oxygen deprivation.
Meaning: if your lungs get fucked up by the virus and it's pneumonia symptoms, they're unlikely to simply stop being able to transfer oxygen into your bloodstream altogether, they'll do it but at a reduced capacity.
