MedlinePlus offers a free online key to common medical abbreviations, including over 30 types of blood tests. This list accompanies an interactive tutorial about how to understand medical terms and abbreviations from the National Library of Medicine.
To help patients understand lab test results, Lab Tests Online offers a free online guide to common notations and abbreviations on lab test results. Common abbreviations include H for high, L for low, and WNL for within normal limits, as stated by the American Association for Clinical Chemistry.
Some of the most common blood tests include blood culture, complete blood count, potassium and blood urea nitrogen, according to the California Pacific Medical Center.