Assuming, you are 12th pass out with PCB. So after that, you can consider below diploma courses -

D.Pharm (Ayurvedic, Siddha Medicine)  2 years
It is a medical diploma course in pharmacy of ayurvedic medicines. Candidate must have passed 10+2 with Physics, Chemistry & Biology.

DMLT (Diploma of Medical Lab Technicians)  1 year
It is a medical diploma course of medical laboratory technology, contains the laboratory practices of the medical field. Candidate must have cleared the 10+2 exam with PCB. You can consider the following names as well Diploma in Clinical Microbiology, Diploma in Clinical Pathology, Diploma in Industrial Microbiology.

You have many options to choose. So consider your interest and potential before selecting anyone.

Good Luck!!!