The primary aim of this research is to determine the accuracy of smartphone pulse oximeters in detecting blood oxygen saturations, episodes of desaturations, and heart rate by comparing results to a Masimo© hospital-grade pulse oximeter.

Inclusion Criteria:

• Ambulatory
• 18 years and older
• Visiting the pulmonary function laboratory at Rush University Medical Center for a 6-minute walk test that agree to participate.

Exclusion Criteria:

• Under the age of 18 years
• High blood pressure above 180/90 mm Hg or pressure below 70/50 mm Hg
• Dizzy, lightheaded or have severe headaches at time of enrollment
• SpO2 at or below 85% on supplemental oxygen
• On oxygen greater than 4 liters per minute
• Gait issues that may result in a fall or patient walks with a walker and did not bring the device to this visit

Patients visiting a pulmonary function lab for 6-minute walk test

While each subject participated in the study. No follow up was made.

47 patient started and completed the study