What is the difference between the following fields: 1 - Laboratory Medicine 2 - laboratory analysis 3- medical tests?

A laboratory medicine or “Clinical Pathology” is a specialty in which pathologists provide testing of patient samples (usually blood or urine) in several different areas, e.g., cardiac enzymes, glucose level, the presence of bacteria and other microorganisms, Hematology, and Transfusion medicine.

A laboratory analysis is the identification and measurement of the chemical constituents of a substance or specimen in the laboratory.

A medical test is a kind of medical procedure performed to detect, diagnose, or monitor diseases, disease processes, susceptibility, and determine a course of treatment.