A collection of organizations providing health information arranged by topic. Also available in alphabetical order.
Laboratory Tests
- American Association for Clinical Chemistry
- American Society for Clinical Pathology
- College of American Pathologists
Lactose Intolerance
- American Gastroenterological Association
- National Institute of Diabetes and Digestive and Kidney Diseases
Laser Eye Surgery
- International Society of Refractive Surgery of the American Academy of Ophthalmology
- National Eye Institute
Latex Allergy
- American Academy of Allergy, Asthma, and Immunology
- Food and Drug Administration
- National Institute for Occupational Safety and Health
Latino and Hispanic American Health
- Centers for Disease Control and Prevention
- Department of Health and Human Services, Office of Minority Health
- National Alliance for Hispanic Health
- National Institute on Minority Health and Health Disparities
Lead Poisoning
- Centers for Disease Control and Prevention
- Department of Housing and Urban Development, Office of Lead Hazard Control and Healthy Homes
- Environmental Protection Agency
- National Center for Healthy Housing
- National Institute of Environmental Health Sciences
Learning Disabilities
- Center for Parent Information and Resources
- Department of Education
- International Dyslexia Association
- Learning Disabilities Association of America
- National Institute of Neurological Disorders and Stroke
Leg Injuries and Disorders
- American Academy of Orthopaedic Surgeons
- National Institute of Arthritis and Musculoskeletal and Skin Diseases
Legionnaires' Disease
Leishmaniasis
- Centers for Disease Control and Prevention
- National Institute of Allergy and Infectious Diseases
- Psychological Health Center of Excellence (Defense Health Agency)
- U.S. Army Medical Department
- U.S. Army Public Health Command
Leukemia
- American Cancer Society
- Leukemia & Lymphoma Society
- National Cancer Institute
- National Marrow Donor Program
Leukodystrophies
- Canavan Foundation
- Genetic and Rare Diseases Information Center
- National Institute of Neurological Disorders and Stroke
- United Leukodystrophy Foundation
Lewy Body Dementia
LGBTQ+ Health
Limb Loss
Listeria Infections
- Centers for Disease Control and Prevention
- Department of Agriculture, Food Safety and Inspection Service
- Food and Drug Administration
- National Institute of Allergy and Infectious Diseases
Liver Cancer
Liver Diseases
- American Association for the Study of Liver Diseases
- American Liver Foundation
- National Institute of Diabetes and Digestive and Kidney Diseases
Liver Transplantation
- American Liver Foundation
- American Society of Transplantation
- National Institute of Diabetes and Digestive and Kidney Diseases
- Organ Procurement and Transplantation Network
Living with HIV/AIDS
- Centers for Disease Control and Prevention
- HIV.gov (National Institutes of Health, Office of AIDS Research)
- HIVinfo (National Institutes of Health, Office of AIDS Research)
Low Blood Pressure
- American Heart Association
- National Heart, Lung, and Blood Institute
- National Institute of Neurological Disorders and Stroke
Lung Cancer
Lung Diseases
- American Association for Respiratory Care
- American College of Chest Physicians
- American Lung Association
- American Thoracic Society
- National Heart, Lung, and Blood Institute
- National Institute of Allergy and Infectious Diseases
Lung Transplantation
- American Society of Transplantation
- National Heart, Lung, and Blood Institute
- Organ Procurement and Transplantation Network
- United Network for Organ Sharing
Lupus
- American Autoimmune Related Diseases Association
- Department of Health and Human Services, Office on Women's Health
- Lupus Foundation of America
- National Institute of Arthritis and Musculoskeletal and Skin Diseases
Lyme Disease
- American Lyme Disease Foundation
- Centers for Disease Control and Prevention
- National Institute of Allergy and Infectious Diseases