But the company’s initial forecast of providing 50,000 tests a day, starting soon, may need to await further validation. A researcher at the Cleveland Clinic, Gary Procop, MD, tested five products on 239 patient samples known to be positive for COVID-19. Abbott’s test missed 15 percent.
IgM shows up earlier than IgG, and hence the IgM test is less likely to miss a true positive when someone produces antibodies in response to a recent infection.