Blood Test: Partial Thromboplastin Time (PTT)
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National Hemophilia Foundation (NHF)
The NHF's Web site contains information on bleeding disorders such as hemophilia.
American Academy of Pediatrics (AAP)
The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.
American Society of Hematology
This group provides information relating to blood, blood-forming tissues, and blood diseases.