Evaluation of the Relationship between CRP/Albumin Ratio and Pulmonary Function Parameters in Patients with...

Novel coronavirus disease 2019 (COVID-19), which has been a global pandemic for nearly 2 years, presents with highly variable clinical manifestations in both the acute and post-acute periods. This study evaluated the relationship between CRP/albumin ratio and pulmonary function at 12 weeks in patients with post-acute COVID-19.

The study included 157 patients with a previous diagnosis of COVID-19 pneumonia who presented to our outpatient clinic with symptoms of post-acute COVID-19 (12 weeks after first testing positive) between July 2021 and October 2021. Patients who had non-severe pneumonia were included in group 1, severe pneumonia that did not require intensive care in group 2, and severe pneumonia that required intensive care in group 3.

At 12 weeks, group 3 had significantly lower percent predicted forced expiratory volume in 1 second (FEV1%), percent predicted forced vital capacity (FVC%), percent predicted diffusing capacity of the lungs for carbon monoxide (DLCO%), and oxygen saturation (SO2) compared to patients in groups 1 and 2 (p = 0.001, 0.04, 0.001, and 0.001, respectively). CRP/albumin ratio was significantly lower in group 2 compared to groups 1 and 3 (p = 0.001). Correlation analysis independent of age and comorbidity showed that CRP/albumin ratio was negatively correlated with SO2, FEV1%, FVC%, and DLCO%.

CRP and albumin levels have prognostic significance during acute COVID-19 infection. The negative correlation between CRP/albumin ratio and respiratory function observed in our study suggest this parameter may be used in the follow-up of patients presenting at 12 weeks with post-acute COVID-19 symptoms.