Introduction: According to the World Health Organization (WHO), COVID-19 has become a Public Health Emergency of International Concern (PHEIC). Understanding patients' hematologic findings in SARS-CoV-2 infection is essential to doing their prognosis, so adjusting care and improving outcomes.
Objective: In this review, we aim at summarizing changes in the hematopoietic system and hemostasis that occur in SARS-CoV-2 infected patients.
Findings: COVID-19 infection is often associated with laboratory hematologic features that can have important clinical implications. Careful revision of baseline hematologic data at diagnosis can predict the severity of illness and help clinicians tailoring the approach and management of patients whose condition can be guarded or critical. The levels of hematologic markers like D-dimer, procalcitonin, C-reactive protein, viral load, inflammatory cytokines, differential blood cell count, and peripheral smear are fundamental for the prognosis. Studies have also shown an association between some of these markers and severe COVID-19 infection requiring admission to the intensive care unit or complicated by acute respiratory distress syndrome (ARDS). Since, so far, a vaccine is not available, prevention of the infection is based on the avoiding people affected and the spreading of the virus; the treatment, in the absence of an effective antiviral agent, is symptomatic, and, in addition to oxygen support, finds in the anti-inflammatory drugs and anticoagulation fundamental therapeutic lines. According to the American Society of Hematology (ASH), all hospitalized patients with COVID-19 should receive pharmacologic thromboprophylaxis with LMWH.
Keywords: COVID-19; Haemostasis; Hematology.