What is hematology? Hematology is the study of blood and blood disorders. Hematologists and hematopathologists are highly trained healthcare providers who specialize in diseases of the blood and blood components. These include blood and bone marrow cells. Hematological tests can help diagnose anemia, infection, hemophilia, blood-clotting disorders, and leukemia.
Roseola is a viral illness that usually affects children between the ages of six months and two years. It is typically marked by several days of high fever, followed by a pinkish-red flat or raised rash that appears on the child's torso and spreads over the body as the fever breaks.
Symptoms of Roseola. 1  Most children get Roseola between 6 months and 3 years of age. 2  Rash: Pink, small, flat spots on the chest and stomach. Rash is the same on both sides of the body. 3  Classic feature: 2 or 3 days of high fever without a rash or other symptoms.  The rash starts 12 to 24 hours after the fever goes 1  away. The rash lasts 1 to 3 days.