Additional tests, folate, polymerase chain reaction (PCR) for COVID and influenza, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), magnesium, alkaline phosphatase (ALP), aspartate transaminase (AST), alanine transaminase (ALT), and bilirubin were all within normal limits, helping narrow down this diagnosis. This evidence concerns the gene CRP and influenza.