[ L ]

• LC₀  maximum sublethal concentration
• LC₅₀  median lethal concentration
• LCA  Leber congenital amaurosis; left carotid artery; left circumflex artery; left coronary artery; leukocyte common antigen; lithocholic acid; liver cell adenoma; lymphocyte chemotactic activity
• LCa  low calcium [diet]
• LCAH  lipoid congenital adrenal hyperplasia
• LCAL  large-cell anaplastic lymphoma
• LCAM  liver cell adhesion molecule
• L1CAM  L1CAM Mutation Database
• LCAO  linear combination of atomic orbitals
• L-CAPS  Low-Density Lipoprotein Coronary Atherosclerosis Prospective Study
• LCAR  late cutaneous anaphylactic reaction
• LCAS  Lipoprotein and Coronary Atherosclerosis Study
• LCAT  lecithin cholesterol acyltransferase
• LCATA  lecithin cholesterol acetyltransferase alpha
• LCB  Laboratory of Cancer Biology; Leber congenital blindness; left costal border; lymphomatosis cutis benigna
• LCBF  local cerebral blood flow
• LCBI  laboratory-confirmed bloodstream infection
• LCC  lactose coliform count; left circumflex coronary (artery); left common carotid; left coronary cusp; life cycle cost [analysis]; lipid-containing cell; liver cell carcinoma; L-type calcium channel
• LCCA  late cortical cerebellar atrophy; leukoclastic angiitis
• LCCME  Liaison Committee on Continuing Medical Education
• LCCS  lower cervical cesarean section
• LCCSCT  large-cell calcifying Sertoli cell tumor
• LCD  lattice corneal dystrophy; liquid crystal diode; liquid crystal display; coal tar solution [liquor carbonis detergens]; localized collagen dystrophy; low-calcium diet
• LC-DCP  low contact dynamic compression plate
• LCDD  light chain deposition disease
• LCDV  lymphocystis disease virus
• LCE  leg cycle ergometry
• LCED  liquid chromatography with electrochemical detection
• LCF  least common factor; left circumflex [coronary artery]; lymphocyte culture fluid
• LCFA, L-cFA  long-chain fatty acid
• LCFU  leukocyte colony-forming unit
• LCG  Langerhans cell granule; Langerhans cell granulomatosis
• LCGL  large-cell granulocytic leukemia
• LCGME  Liaison Committee on Graduate Medical Education
• LCGR  lutropin-choriogonadotropin receptor
• LCGU  local cerebral glucose utilization
• LCH  Langerhans cell histiocytosis
• LCh  Licentiate in Surgery
• L-CHAD  long-chain 3-hydroxyacyl coenzyme A dehydrogenase
• LCI  length complexity index
• LCIN  low-grade cervical intraepithelial neoplasia
• LCIS  lobular carcinoma in situ
• LCL  lateral collateral ligament; left coronary leaflet; Levinthal-Coles-Lillie [body]; lower confidence limit; lower control limit; lymphoblastoid cell line; lymphocytic lymphosarcoma; lymphoid cell line
• LCLC  large-cell lung carcinoma
• LCLo  lowest lethal concentration
• LCM  laser-capture microdissection; latent cardiomyopathy; left costal margin; leukocyte-conditioned medium; lowest common multiple; lymphatic choriomeningitis; lymphocytic choriomeningitis
• LCME  Liaison Committee on Medical Education
• LCMG  long-chain monoglyceride
• L/cm H₂O  liters per centimeter of water
• LC-MS  liquid chromatography-mass spectrometry
• LC/MS  liquid chromatography/mass spectrometry
• LCMV  lymphocytic choriomeningitis virus
• LCN  lateral cervical nucleus; left caudate nucleus; line correlated noise; lipocalin
• LCNB  large core needle biopsy
• LCO  left coronary ostium; low cardiac output
• LCOS  low cardiac output syndrome
• LCP  Legg-Calve-Perthes [syndrome]; long-chain polysaturated [fatty acid]; lymphocyte cytosol polypeptide
• LCPD  Legg-Calve-Perthes disease
• LCPS  Licentiate of the College of Physicians and Surgeons
• LCQ  Learning Climate Questionnaire
• LCR  late cutaneous reaction; lifetime clinical record; ligase chain reaction; locus control region [genomic sequencing]; long control region
• Lcr  low calcium response
• LCRB  locus control region beta
• LCRI  limit cycle reciprocal interaction
• LCRUS  Leigh Clinical Research Unit Study
• LCrv  retroventral lateral cortex
• LCS  cerebrospinal fluid [Lat. liquor cerebrospinalis]; laboratory of computer science; laparoscopic coagulating shear; left coronary sinus; Leydig cell stimulation; lichen chronicus simplex; life care service; Life Closure Scale; longest common substring; low constant suction; low continuous suction; lymphocyte culture supernatants
• LCSB  Liaison Committee for Specialty Boards
• LCSC  local community service centre [Canada]
• LCSD  left cardiac sympathetic denervation
• LCSG  Lung Cancer Study Group
• LCSS  lethal congenital contracture syndrome
• LcSSc  limited cutaneous systemic sclerosis
• LCST  low critical solution temperature
• LCSW  licensed clinical social worker
• LCT  laser dynamic compliance measurement technique; liquid crystal thermography; liver cell tumor; long-chain triglyceride; lymphocytotoxicity; lymphocytotoxin
• LCt₅₀  median lethal vapor or aerosol concentration
• LCTA  lymphocytotoxic antibody
• LCU  laparoscopic contact ultrasonography; life change unit
• LCuV  leaf curl virus
• LCV  Lake Clarendon virus; lecithovitellin; leukocytoclastic vasculitis; lymphocytic choriomeningitis virus
• LCWI  left cardiac work index
• LCX  left circumflex [coronary artery]
• LCXB  left [coronary] circumflex branch
• LD  label dictionary; labor and delivery; laboratory data; labyrinthine defect; lactate dehydrogenase; Lafora disease; L-dopa (levodopa); laser Doppler; learning disability; learning disorder; left deltoid; Legionnaires' disease; lethal dose; levodopa; light differentiation; limited disease; linear dichroism; linear discriminate; linguodistal; linkage disequilibrium; lipodystrophy; liver disease; living donor; loading dose; Lombard-Dowell [agar]; longitudinal diameter; low density; low dose; Lyme disease; lymphocyte-defined; lymphocyte depletion
• L-D  Leishman-Donovan [body]
• L/D  light/darkness [ratio]
• L&D  labor and delivery
• LD₁  isoenzyme of lactate dehydrogenase found in the heart, erythrocytes, and kidneys
• LD₂  isoenzyme of lactate dehydrogenase found in the lungs
• LD₃  isoenzyme of lactate dehydrogenase found in the lungs
• LD₄  isoenzyme of lactate dehydrogenase found in the liver
• LD₅  isoenzyme of lactate dehydrogenase found in the liver and muscles
• LD₅₀  median lethal dose
• LD_50/30  a dose that is lethal for 50% of test subjects within 30 days
• LD₁₀₀  lethal dose in all exposed subjects
• Ld  Leishmania donovani
• LDA  laser Doppler anemometry; left dorso-anterior [fetal position]; linear discriminant analysis; low density area; lymphocyte-dependent antibody
• LDAC  low-dose cytosine arabinoside
• LDAR  latex direct agglutination reaction
• LDB  lamb dysentery bacillus; Legionnaires' disease bacillus; Location Database [genetics]
• LDC  lactose digestion capacity; limited assistance dialysis center; lymphoid dendritic cell; lysine decarboxylase
• L-dC  L-deoxycytidine
• LDCC  lectin-dependent cellular cytotoxicity
• LDCF  lymphocyte-derived chemotactic factor
• LDCI  low-dose continuous infusion
• LDCMC  Lady Davis Carmel Medical Center
• LdCPV  Lymantria dispar cypovirus
• LDCT  late distal cortical tubule
• LDD  late dedifferentiation; light-dark discrimination; liquefy, digest, and discharge
• LDDB  London Dysmorphology Database
• LDDE  low-dose dobutamine echo
• LDER  lateral-view dual-energy radiography
• LD-EYA  Lombard-Dowell egg yolk agar
• LDF  laser Doppler flowmetry; laser Doppler flux, laser Doppler fluxometry; limit dilution factor
• LDFA  linear discrimination functional analysis
• LDG  lactic dehydrogenase; limit grid displacement; lingual developmental groove
• L-dG  L-deoxyguanosine
• LDH  lactate dehydrogenase; low-dose heparin
• LDHA  lactic dehydrogenase A
• LDHB  lactic dehydrogenase-B
• LDHC  lactic dehydrogenase-C
• LDHSPS  Low Dose Heparin Stroke Prevention Study
• LD im  lethal intramuscular dose
• LD ip  lethal intraperitoneal dose
• LDL  loudness discomfort level; low-density lipoprotein
• LDLA  low-density lipoprotein apheresis
• LDL A  low-density lipoprotein receptor class A
• LDL B  low-density lipoprotein receptor class B
• LDL-C, LDL-c  low-density lipoprotein/cholesterol complex
• LDL/HDL  low-density lipoproteins/high-density lipoproteins ratio
• LD_Lo  lowest lethal dose
• LDLP  low-density lipoprotein
• LDLR, LDL-R  low-density lipoprotein receptor; Low-Density Lipoprotein Receptor Mutation Database
• LDM  lactate dehydrogenase, muscle; limited dorsal myeloschisis
• LDMF  latissimus dorsi myocutaneous flap
• LD-NEYA  Lombard-Dowell neomycin egg yolk agar
• L-DOPA, L-dopa  [levo-3, 4-dihydroxyphenylalanine] levodopa
• LDP  left dorsoposterior [fetal position]; lumbodorsal pain
• LDR  labor, delivery, recovery; lifetime data repository; low dose rate
• LDRI  leukotriene D4 receptor inhibitors
• LDRPS  labor-delivery-recovery-postpartum suite
• LDRS  labor-delivery-recovery suite
• LDS  Licentiate in Dental Surgery; lightweight decontamination system; Lipids in Diabetes Study; locked door seclusion
• LDSc  Licentiate in Dental Science
• LDT  left dorsotransverse [fetal position]
• LDUB  long double upright brace
• LDUH  low-dose unfractionated heparin
• LDV  lactate dehydrogenase-elevating virus, lactic dehydrogenase virus; large dense-cored vesicle; laser Doppler velocimetry; lateral distant view; Le Dantec virus; Lordsdale virus
• LE  lactate extraction; law enforcement; left ear; left eye; leukocyte elastase; leukoerythrogenic; life expectancy; linkage equilibrium [population genetics]; live embryo; Long Evans [rat]; low exposure; lower extremity; lupus erythematosus [cell]
• LEA  lower extremity amputation; lumbar epidural anesthesia
• LEADER®  Lightweight Epidemiological Advanced Detection and Emergency Response System
• LEAF  layman education and activation system
• LEAP  Lower Extremity Amputation Prevention [program]
• LEAV  Leanyer virus
• LEBV  Lebombo virus
• LEC  leprosy elimination campaign; leukoencephalitis; long Evans cinnamon [rat]; low energy cardioversion; lower esophageal contractility
• LECP  low-energy charged particle
• LED  light-emitting diode; lowest emitting dose; lupus erythematosus disseminatus
• LEDC  low-energy direct current
• LEDV  Lednice virus
• LEE  locus of enterocyte effacement
• LEED  low-energy electron diffraction
• LEEDS  low-energy electron diffraction spectroscopy
• LEEP  left end-expiratory pressure; loop electrosurgical excision procedure
• LEER  likelihood equivalent error
• LEET  Low-Energy Endotak Trial
• LEF  late expression factor; leukokinesis-enhancing factor; lupus erythematosus factor; lymphoid-enhanced binding fac- tor; lymphoid enhancer factor
• Leg  legislation; legal
• LEHR  lifetime electronic health record
• LeIF  leukocyte interferon
• LEIS  low-energy ion scattering
• LELC  lymphoepithelioma-like carcinoma
• LEL  lower explosive limit; lowest effect level
• LEM  lateral eye movement; Leibovitz-Emory medium; leukocyte endogenous mediator; light electron microscope; light emission microscopy; low-electrolyte meal
• LEMA  least error matrix analysis
• LEMO  lowest empty molecular orbital
• LEMS  Lambert-Eaton myasthenic syndrome
• Lenit  lenitive
• LENT  late effect to normal tissues
• LEOPARD  lentigines, EKG abnormalities, ocular hypertelorism, pulmonary stenosis, abnormalities of genitalia, retardation of growth, and deafness [syndrome]
• LEP  laboratory of enteric pathogens; lethal effective phase; lipoprotein electrophoresis; low egg passage; lower esophageal pressure
• Lep  leptotene
• LEPC  local emergency planning committee
• L_EPN  effective perceived noise level
• LEPR  leptin receptor
• Leq  loudness equivalent
• LER  lysozomal enzyme release
• LERG  local electroretinogram
• LERS  learning from examples based on rough sets
• LES  Lambert-Eaton syndrome; Lawrence Experimental Station [agar]; Life Experiences Survey; lifestyle evaluation system; local excitatory state; Locke egg serum; low excitatory state; lower esophageal sphincter; lupus erythematosus, systemic
• Les  lesion
• LESD  Letterer-Siwe disease
• LESP  lower esophageal sphincter pressure
• LESS  lateral electrical spine stimulation
• LESSD  lupus erythematosus, specific skin disease
• LESTR  leukocyte-derived seven-transmembrane domain receptor
• LET  lidocaine, epinephrine, and tetracaine [solution]; linear energy transfer; Losartan Effectiveness and Tolerability [study]
• LETD  lowest effective toxic dose
• LETS  large external transformation-sensitive [protein]; Leiden Thrombophilia Study

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