If you are talking about the medical laboratory courses after class 12, here are the options that you have:

1. Diploma in Medical Lab Technology (MLT)  (2 year program)

2. B.Sc in MLT (3 year program)

A Bachelors in Science has the upper hand for obvious reasons, and it enables you to conduct clinical tests which are useful to diagnose, treat, and prevent a wide range of medical conditions.

Eligibility for both the courses is 10+2 in Science stream, with 50% aggregate marks for BSc and 40% for DMLT. The subjects that you require are PCM/B