If you are experiencing a medical emergency please dial 911 immediately
An international unit is an arbitrary amount of a substance agreed upon by scientists and doctors; a liter is a measure of volume that is slightly greater than a quart.
Some medical tests report results using international units (IU) per liter (L).
Last Revised: May 10, 2013
Author: Healthwise Staff
Medical Review: Anne C. Poinier, MD - Internal Medicine & Thomas M. Bailey, MD - Family Medicine
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