CRP and lymphopenia: Studies have showed the existence of hematological and biochemical markers useful in the diagnosis, management and prognosis of COVID-19, as well as for Long COVID, such as neutrophilia, lymphopenia, thrombocytopenia, increased neutrophil/lymphocyte ratio (NLR) and increased inflammatory markers, such as CRP (C-Reactive Protein), ESR (Erythrocyte Sedimentation Rate) and LDH (lactate dehydrogenase) [2].