| Labyrinthitis |
| Laceration |
| Lack of coordination |
| Lack of intrinsic factor |
| Lack of menses |
| Lack of regular bowel movements |
| Lack of strength |
| Lack of thirst |
| Lacquer |
| Lacrimal gland tumor |
| Lactase deficiency |
| Lactate dehydrogenase |
| Lactate test |
| Lactation |
| Lactation – abnormal |
| Lactic (lactate) dehydrogenase isoenzymes |
| Lactic acid dehydrogenase |
| Lactic acid test |
| Lactic acidosis |
| Lacto-ovovegetarian |
| Lacto-vegetarian |
| Lactose intolerance |
| Lactose tolerance test |
| Laennec’s cirrhosis |
| Lambert-Eaton Syndrome |
| Lamellar ichthyosis |
| Laminography |
| Lamp oil poisoning |
| Landouzy-Dejerine muscular dystrophy |
| Landry-Guillain-Barre syndrome |
| Langerhans cell histiocytosis |
| Language disorder – expressive |
| Language impairment |
| Lanolin poisoning |
| Lanoxin overdose |
| Laparoscopic cholecystectomy |
| Laparoscopic egg harvest |
| Laparoscopic hysterectomy |
| Laparoscopic oophorectomy |
| Laparoscopic radical prostatectomy |
| Laparoscopic tubal ligation |
| Laparoscopy |
| Laparotomy |
| Large bowel resection |
| Large for gestational age (LGA) |
| Large intestine surgery |
| Larva migrans visceralis |
| Laryngeal cancer |
| Laryngeal nerve damage |
| Laryngitis |
| Laryngoscopy |
| Laryngotracheobronchitis – acute |
| Laser lithotripsy |
| Laser prostatectomy |
| Laser retinopexy |
| Laser surgery |
| Laser therapy |
| Laser vision correction |
| Laser-Assisted In Situ Keratomileusis |
| LASIK |
| LASIK eye surgery |
| Late persistent Lyme disease |
| Late syphilis |
| Lateral |
| Lateral collateral ligament (LCL) injury of the knee |
| Lateral epicondylitis |
| Lateral rectus palsy |
| Lateral traction |
| Latex agglutination test |
| Laundry starch |
| Lavender oil |
| Laxative abuse |
| Laxative colitis |
| Laxative overdose |
| Laxopol overdose |
| Lazy eye |
| Lazy eye repair |
| LCL injury |
| LD |
| LDH |
| LDH isoenzymes |
| LDL test |
| LE cell test |
| Lead – nutritional considerations |
| Lead and tap water |
| Lead levels – blood |
| Lead poisoning |
| Lead poisoning – nutritional considerations |
| LeFort injuries |
| Left cardiac catheterization |
| Left heart catheterization |
| Left heart ventricular angiography |
| Left ventricular assist device |
| Left ventricular outflow tract obstruction |
| Left ventriculography |
| Left-sided heart failure |
| Leg and arm movements – uncontrollable |
| Leg lengthening/shortening |
| Leg pain |
| Leg swelling |
| Legg-Calve-Perthes disease |
| Legionella pneumonia |
| Legionnaire’s disease |
| Leiomyoma |
| Leiomyoma – intestine |
| Leiomyosarcoma |
| Leishmaniasis |
| Lemming fever |
| Lens opacity |
| Leopard lily poisoning |
| Leopard syndrome |
| Lepromin skin test |
| Leprosy |
| Leprosy skin test |
| Leptospirosis |
| Lesch-Nyhan syndrome |
| Let-down reflex |
| Lethargy |
| Letterer-Siwe disease |
| Leucine aminopeptidase – serum |
| Leucine aminopeptidase – urine |
| Leukemia |
| Leukemia – acute childhood (ALL) |
| Leukemia – acute granulocytic |
| Leukemia – acute myeloid (AML) |
| Leukemia – chronic granulocytic (CML) |
| Leukemia – chronic lymphocytic (CLL) |
| Leukemia – hairy cell |
| Leukemia – nonlymphocytic (ANLL) |
| Leukemia – resources |
| Leukemic reticuloendotheliosis |
| Leukemoid reaction |
| Leukocoria |
| Leukocyte alkaline phosphatase |
| Leukocyte count |
| Leukocyte esterase |
| Leukocyte scan |
| Leukodystrophy – metachromatic |
| Leukonychia |
| Leukoplakia |
| Lewy body dementia |
| Leydig cell tumor |
| LFT |
| LGV |
| LH blood test |
| LH response to GnRH |
| LH urine test (home test) |
| Librium overdose |
| Lice – body |
| Lice – head |
| Lice – pubic |
| Lice bites |
| Lice medication poisoning |
| Lichen planus |
| Lichen simplex chronicus |
| Lichenified |
| Light sensitivity |
| Lighter fluid |
| Lightheadedness – dizzy |
| Lightheadedness – fainting |
| Liljekonvall |
| Lily-of-the-valley |
| Limb plethysmography |
| Limb-girdle muscular dystrophies |
| Limb-kinetic apraxia |
| Lime milk |
| Limited range of motion |
| Linear skull fracture |
| Lip moisturizer poisoning |
| Lipase test |
| Lipid disorders |
| Lipid profile |
| Lipids |
| Lipofuscin |
| Lipofuscinoses |
| Lipoid nephrosis |
| Lipoprotein-a |
| Lipoprotein/cholesterol analysis |
| Liposuction |
| Lips – bluish |
| Lips – chapped and dry |
| Liqui-Histine overdose |
| Liqui-minic infant overdose |
| Liquid medication administration |
| Liquid nitrogen |
| Liquor |
| Listerine overdose |
| Listeriosis |
| Litcon |
| Lithane |
| Lithium overdose |
