The doctors and nurses didn’t believe Tomisa Starr was having trouble breathing. Two years ago, Starr, 61, of Sacramento, California, was in the hospital for a spike in her blood pressure.

The Food and Drug Administration's recommendations apply to pulse oximeters, which are clip-on devices used in hospitals and medical clinics to ensure patients are getting enough oxygen.

The pulse oximeter market has emerged as a cornerstone in the healthcare sector, driven by the rising awareness of health monitoring and the growing demand for non-invasive diagnostic tools. This ...

But her request for supplemental oxygen while hospitalized was denied, Starr said, because readings from a pulse oximeter on her finger falsely indicated that she was getting plenty of air on her own.

The Food and Drug Administration’s recommendations apply to pulse oximeters, which are clip-on devices used in hospitals and medical clinics to ensure patients are getting enough oxygen.