Medical technology - perform microscopic and biochemical tests that aid in diagnosis. However, there is no requirement as to major. Choose a major based on your interests. Some schools also require calculus. Dental schools may require a course in public speaking.
Many veterinary schools require biochemistry.
Identify the schools to which you might want to apply, and send for their catalogs. Each member of the Pre-medical Advising Committee has one. The chair of the Pre-medical Advising Committee also has some information on other options. Read the catalogs to be sure you understand the entrance requirements and application deadlines for the schools of interest to you. If you are not a resident of that state, check to see if they accept non-residents.