Fig. 1

Study design and number of specimens tested with the LumiraDx SARS CoV-2 Ag Test and PCR-based methods. All symptomatic patients presenting at two different urgent care centers with 12 days of symptom onset were tested with the LumiraDx SARS-CoV-2 Antigen Test (n = 2241). A subset of these patients tested SARS CoV-2 Ag positive (n = 549) and negative (n = 1692). Based upon a healthcare provider’s assessment, patients with a low likelihood of SARS CoV-2 infection were excluded from further testing (N = 892). Patients with a moderate to high likelihood of SARS CoV-2 infection were also tested with a PCR-based method (n = 800). A subset of these patients tested positive (n = 30) and negative (n = 770) for SARS CoV-2 by PCR