When to Use Level vs Amount vs Concentration

Many scientific and medical authors misuse the word “level” instead of "amount" or "concentration.” Although "amount" and "concentration" have fairly simple definitions, "level" has a more complex definition. And this complexity can confuse readers.

Definitions

“Amount” means the total number or quantity, and “concentration” means the amount of a component in a given area or volume. These simple and singular definitions are clear for readers.

However, “level” has multiple definitions, including a concentration of something; a position in a scale; a measurement or index of altitude; the magnitude of a quantity related to another value; even or unvarying height; or a device that helps to establish a horizontal line or plane.

Because "level" has many definitions, readers may feel confused about—and even need to guess—the meaning you intend.

To ensure that your writing is clear, use "amount" or "concentration" by default. Only use "level" when no other word will do.

Examples

The drug reduced the concentration of platelets.

The treatment increased the amount of interferon.

The femur was leveled during the procedure.