PTX3 and COVID-19: For example, one of these studies showed that PTX3 predicts 28-day mortality in COVID-19 better than conventional markers and that PTX3 was higher in ICU patients vs. medical wards, with concentrations that were strikingly similar to those reported in the present study (21.0 ng/mL in ICU vs 12.4 ng/mL in non-ICU), despite the lack of any assay harmonization (6).