Working as a lab tech (in a clinical laboratory) is useful, because it teaches you a lot about lab tests, what they can determine, their limitations, etc. However, it is not clinical experience because you are not working directly with patients. Phlebotomy would be useful for the same reasons, and it does count as clinical experience because you are working with patients. IMO, working as a hospital, rather than outpatient, phlebotomist is more useful for applications, because you get a better sense on how the hospital works, and even get the opportunity to work with nurses and physicians.