ALB and Hypoalbuminemia: Confirmed by ROC analysis, combining urinary SARS-CoV-2 N higher than 512.2 pg/mL and hypoalbuminemia below 2.05 g/dL (two-variable model, AUC 0.94, p = 0.0009, Figure 3A) outperformed urinary SARS-CoV-2 N alone (AUC 0.81, p = 0.0211, comparison of models: p = 0.0016) or plasma albumin alone (AUC 0.78, p = 0.03, comparison of models: p = 0.0061).