Bsc microbiologist can open his own laboratory, like blood test and other test
You must be a qualified pathologist and you must have required a license to practice from the Medical Council of India. You will need a biochemist, a pathologist, and a microbiologist. Laboratory Technicians with Diploma or Bachelor's Degree in Medical Laboratory Technology.
So not only Bsc Microbiologist is enough for opening a business of pathology.
I hope this answer helps. All the very best for your future endeavors!