Doctors say for most people they aren't needed -- and may even be a bad idea. Lung problems like pneumonia and respiratory failure can be some of the most severe symptoms of COVID-19. Knowing how your ...

Monitoring your oxygen level with a pulse oximeter if you have COVID-19 can help determine if it falls too low. Low levels may need medical attention. COVID-19 is a respiratory infection. It can cause ...

In the early days of the COVID-19 pandemic, Ashraf Fawzy remembers one patient, a Black woman with asthma, who arrived in the intensive care unit of Johns Hopkins Hospital. Despite her pulse oximeter ...

As a triple threat of respiratory illnesses – flu, Covid-19 and respiratory syncytial virus, known as RSV – sweeps the United States, emergency departments are using one small tool more than usual to ...