The Department of Pathology & Transfusion Medicine made its small beginning with all the sub specialties in 1971. Since then the growth has been phenomenal. The Department was renamed as Brig T.K. Narayanan Department of Pathology & Transfusion Medicine in August 2008. In 2014, the Santokba Institute of Transfusion Medicine also came into existence. The Department serves both the 'in house' and 'walk in' patients from outside. Different sections of the Department are geographically located in SDMH campus. The department has nine full time consultants. The procedures like bone marrow- aspiration/trephine biopsy, fine needle aspiration, trucut biopsy, plasmapheresis, single donor platelet apheresis and phelebotomy are carried out in the department. The department has numerous publications in peer reviewed indexed national and international journals. It conducts a DNB course in pathology with an intake of four students per year accredited by National Board of Examinations.

The department has been pioneer in :-
• .Ongoing “Global Patient Percentile Monitoring Project” –Only participant from Asian collaboration with University of Ghent, Belgium.
• .Published world's 1st case - ESCC with Metastasis in the Young Age of Caustic Ingestion of Shortest Duration: Case Report With Review Of Literature. International Journal of Gastrointestinal Cancer. 2010 Jun; 41(2):93-5
• .1st NABL Accredited Clinical Laboratory Of Rajasthan
• .First NABH Accredited Blood Bank of Rajasthan.
• .First Blood Bank of country to start fully automated Nucleic acid testing in blood donors.