8–252 mcg/L), interleukin-6 <40 pg/mL (normal range: <4.4 pg/mL)), moderate pneumonia (defined as CURB-65 Severity Score ≥2 or Pneumonia Severity Index ≥III, basal oxygen saturation >92–95%, respiration rate at rest 22–30, bilateral opacities, D-dimer >1000 ng/mL, ferritin >1000 mcg/L, interleukin-6 <40 pg/mL), and severe pneumonia (defined as sepsis or shock with acute respiratory distress syndrome (ARDS), basal oxygen saturation <92%, respiration rate at rest >30, bilateral opacities, D-dimer >3000 ng/mL, ferritin >1000 mcg/L, interleukin-6 >40 pg/mL, elevated troponin I).