Limitation
Although this antibody test had provided useful information to our
department, there are some limitations to our findings. HEALGEN COVID-19
quoted accuracy of more than 90% in diagnosing RT-PCR positive
patients.30 However, it is not authorized for
emergency use by the United States Food and Drug
Administration.39 It is also not validated on mild to
asymptomatic individuals. The serology antibody test is not suitable to
detect acute infection due to the nature of the immune response. Thus,
staff who were infected within a week may show false-negative results.
It is also unknown to many regarding the duration of antibody present in
the blood after previous exposure. A positive IgG test may not be
protective for future infection and deployment of staff at high-risk
area should still be done with the highest degree of infection
control.19