CRP and chronic obstructive pulmonary disease: Apart from the risk of complications, some studies have found associations between 30-day mortality and high serum C-reactive protein (CRP) levels, low serum albumin levels, low serum thrombocyte levels, anaemia, old age, chronic obstructive lung disease, ischemic heart disease, underlying neurological disease and recent treatment in an intensive care unit, although the findings are not consistent [13–23].