Dr Birg received a B.S degree in Biomedical Engineering (2009) from the University of Tennessee. He earned his Doctor of medicine degree (2013) from the University of Tennessee Health Science Center. Following his MD degree, he completed an Internal Medicine residency at the University of Illinois-Chicago and fellowship in Gastroenterology and Hepatology at the University of New Mexico.

Personal Statement

My research interests are to evaluate the role of gut microbiome and its metabolites on different disease states. My ongoing research has focused on intestinal bacterial-produced gases that have a significant but poorly-understood impact on human disease and symptoms. My recent work has focused on gastrointestinal, cardiovascular, and liver physiology impact of the microbiome. My focus has been on translational research incorporating bench-to-bedside studies.

Areas of Specialty

Lactulose breath testing
Functional bowel disease


  • Russian

Research and Scholarship

Birg A, Lin HC, Kanagy N. Portal Venous Flow Is Increased by Jejunal but Not Colonic Hydrogen Sulfide in a Nitric Oxide-Dependent Fashion in Rats. Dig Dis Sci. Springer; 2020

Birg A, Ritz NL, Lin HC. C. The Unknown Effect of Antibiotic-Induced Dysbiosis on the Gut Microbiota. In: Faintuch J, Fanituch S, editors. Microbiome and Metabolome In Diagnosis, Therapy, and other Strategic Applications. Cambridge, MA: Academic Press; 2019. p. 195-199.

Birg A., Hu, S. and Lin, H.C., 2019. Reevaluating our understanding of lactulose breath tests by incorporating hydrogen sulfide measurements. JGH Open, 3(3), pp.228-233.