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).
Primary Medical ReviewerAnne C. Poinier, MD - Internal Medicine
Specialist Medical ReviewerThomas M. Bailey, MD - Family Medicine
Current as ofSeptember 9, 2014
WebMD Medical Reference from Healthwise