ALB and Pleural effusion: When the protein is insufficient, it will lead to weakened limb function, affect fracture healing, and increase bed rest time; others, the deficiency of serum albumin causes the decrease of plasma colloid osmotic pressure and the increase of interstitial fluid, which may lead to pleural effusion, thus increasing the incidence of HAP.[29,60] In contrast, high RDW and Cr levels are associated with HAP.