ALB and pneumonia: Many clinical prediction tools have been used during the COVID-19 pandemic, including A-DROP, CURB-65 (Confusion, Urea, Respiratory rate, Blood pressure, and age ≥ 65), Pneumonia Severity Index (PSI), SMART-COP (Systolic blood pressure, Multilobar infiltrates, Albumin, Respiratory rate, Tachycardia, Confusion, Oxygen, and pH), and National Early Warning Score 2 (NEWS2).