ALB and chronic kidney disease: Multivariable linear regression showed a weak but clinically relevant correlation between the fraction of oxidized albumin and creatinine, when corrected for age and chronic kidney disease before ICU admission (R<sup>2</sup> 0.31, p < 0.001).<h4>Conclusion</h4>Fractions of HNA-1 were higher in Covid-19 patients compared to healthy controls.