Final answer:
The 3 units of measurement used in the medical field include meter, liter, and gram, all of which are part of the metric system. Inches, mentioned in the options, are not part of the metric system but the Imperial system, which is primarily used in the United States.
Step-by-step explanation:
The 3 units of measurement commonly used in the medical field that are mentioned in the question are the meter (m), liter (L), and gram (g), which are all part of the metric system. The metric system is a system of measurement used in science and most countries outside of the United States, and it operates on multiples of ten. Within this system, measurements such as kilogram (kg), microliter (μL), milliliter (mL), liter, and kiloliter (kL), as well as area measurements like square centimeter (cm²) and square meter (m²), and the temperature scale Celsius, are used extensively. From the options provided, inches are not part of the metric system; instead, they are part of the Imperial system of measurement, which is primarily used in the United States.