The Washington Manual of Medical Therapeutics
- Lactation, folate deficiency
- Lactulose
- Lactulose enema
- Lambert-Eaton myasthenic syndrome (LEMS)
- Lamotrigine [table]
- Large vessel vasculitis
- Latent tetany
- Latent tuberculosis infection (LTBI)
- Left heart catheterization
- Left ventricular hypertrophy (LVH)
- Leg ulceration
- Leg ulcers, sickle cell disease
- Leptospira interrogans
- Leptospirosis
- Lesinurad [table]
- Letermovir
- Leucovorin
- Leukemoid reaction
- Leukocyte counts, pseudogout
- Leukocytosis
- Leukoreduction
- Leukostasis
- Leukotriene modifiers
- Levalbuterol [table]
- Levetiracetam [table]
- L-glutamine
- Liddle syndrome
- Lightheadedness
- Lille model
- Limited cutaneous polyarteritis nodosa
- Limited scleroderma
- Linagliptin [table]
- Lip cancers, graft rejection
- Lipid emulsions
- Lipoglycopeptides
- Liposomal amphotericin B
- Liraglutide [table]
- Listeria monocytogenes
- Liver dysfunction
- Liver transplant recipients
- Living donor transplants
- Lixisentatide [table]
- Lobectomy, pulmonary
- Localized scleroderma
- Löfgren syndrome
- Long-acting lipoglycopeptides
- Lorazepam
- Lower respiratory tract infections
- Low inspired oxygen
- Low-molecular-weight heparin (LMWH)
- Luminal gastrointestinal disorders
- Lung abscess
- Lung transplant rejection
- Lung volume reduction surgery (LVRS)
- Lupus nephritis (LN)
- Luspatercept
- Lymeborreliosis
- Lyme disease
- Lymphadenitis
- Lymphocytic-variant hypereosinophilic syndrome (L-HES)