Final answer:
All the mentioned units are still used in the health field. However, units like milliliters, which are part of the SI units, are more commonly used globally. Non-metric units like gallons, fluid ounces, and pints are often used in non-metric countries like the U.S.
Step-by-step explanation:
All units mentioned - the milliliter, gallon, fluid ounce, and pint - are still used in the health field to varying extents depending upon the context and geographical location. However, it should be noted that the health field generally relies more on metric units such as the milliliter because it complies with the SI (Intenrational System of Units), which are universally accepted for scientific usage.
Conversely, units like the gallon, fluid ounce and pint are predominantly used in countries that have not adopted the metric system, such as the United States.
It's worth mentioning that regardless of the units used, precise volume measurements are crucial to ensure accurate dosages in healthcare settings.
Learn more about Volume Measurement Units