None of transferrin isoforms changed in COVID-19 patients depending on the modifited early warning score (MEWS) (p = 0.327, p = 0.110, p = 0.064 and p = 0.544, respectively, for 5-sialoTRF, 4-sialoTRF, 3-sialoTRF and 2-sialoTRF). Here, TF is linked to COVID-19.