n. measures which indicate the amount of certain substances relative to a set amount of blood. These observed, measured levels are compared with a level or range of values considered to either be normal or toxic. Also called circulating levels.

BLOOD LEVELS: "In indicating the concentration of substances, blood levels may be expressed in milligrams, micrograms, or percentages. "
Cite this page: N., Pam M.S., "BLOOD LEVELS," in, April 7, 2013, (accessed September 27, 2021).