IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-1-45912 Original Research Paper A Prospective Study Of Serum Procalcitonin And Crp As A Severity Of Acute Exacerbation Of Chronic Obstructive Pulmonary Disease Yadav Dr. Deepak Gupta Dr. Anil Panwar Dr. January 2023 12 1 01 02