The page below is a sample from the LabCE course Myeloproliferative Neoplasms. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Myeloproliferative Neoplasms (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 94 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

Hypereosinophilic Syndrome (HES)

HES is a primary disorder of eosinophils due to clonal overproduction in the bone marrow. HES is characterized by a persistent increased eosinophil count (>1.5 × 109/L) and eosinophil-related tissue damage. There are three categories of HES including: myeloproliferative, idiopathic, and a novel HES variant called "lymphocytic" HES. Eosinophilia that is associated with allergic reactions does not indicate the presence of HES.

Note the eosinophilia present in the peripheral blood of this Hypereosinophilic Syndrome patient.