In particular, the ARDS group had significantly higher levels of white blood cells, neutrophils, incidence of lymphopenia, total bilirubin (TBIL), lactate dehydrogenase (LDH), blood urea nitrogen (BUN), highly sensitive C-reactive protein (hsCRP), procalcitonin (PCT), D-dimer, and prothrombin time (PT), and significantly lower levels of lymphocytes and albumin (all p < 0.05). Here, F2 is linked to lymphopenia.