patient woman using fingertip pulse oximeter oxygen saturation meter spo2 pr blood monitor finger on white background

background blood bpm cardiac cardiology care check coronavirus covid19 device digital disease electronic equipment finger fingertip hand health heart heartbeat hemoglobin home level measure measurement medicine meter monitor monitoring normal oximeter oximetry oxygen oxygenation oxymeter patient people person pressure pulse pulsoximeter rate saturation spo2 symptom technology test tool using vital white woman