ALB and Hyponatremia: Compared to AECOPD patients with normonatremia, the rate of fever, WBC, NS, NS%, NLR, PCT, ESR, PH, and AG were markedly higher, meanwhile, LYM, EOS, LYM%, EOS%, serum Ca2+, serum Mg2+, and ALB were significantly lower in AECOPD patients with hyponatremia (Table 2).