Post COVID-19 Syndrome: Biomarkers and Laboratory Evaluation

COVID-19 is a highly contagious acute respiratory disease caused by an RNA virus called SARSCoV-2 (severe acute respiratory syndrome corona virus-2). Two-year experience with COVID19 demonstrates that the infection is not localized to respiratory system but is a multi-system or multi-organ disease and may become chronic. The persistence of symptoms was observed for weeks, or months following recovery from COVID-19 and was identified as a distinct entity called postCOVID-19 syndrome (PCS), long COVID-19, Chronic COVID-19, or post-acute sequelae of COVID-19 (PASC). Though there is no general agreement on the duration, continuity of symptoms for at least three months from the onset of disease or two months following the hospital discharge was usually considered as PCS1.