[ L ]

• LPI  left posterior-inferior; lysinuric protein intolerance
• LPIFB  left posteroinferior fascicular block
• LPIH  left posteroinferior hemiblock
• LPK  liver pyruvate kinase
• LPL  lethal-potentially-lethal; lichen planus-like lesion; lipoprotein lipase; local probability of lesion
• LPLA  lipoprotein lipase activity
• LPM  lateral pterygoid muscle; leverage and parallelepiped mechanism [computer-assisted surgery]; liver plasma membrane
• Lpm  lines per minute; liters per minute
• Lp/mm  line pairs per millimeter
• LPN  Licensed Practical Nurse
• LPO  lactoperoxidase; left posterior oblique; light perception only; lipid peroxidation
• LPP  large plaque parapsoriasis; lateral pterygoid plate
• LPPH  late postpartum hemorrhage
• LPR  lactate-pyruvate ratio; late phase reaction
• Lpro  longitudinal prospective [trial]
• LPS  lateral premotor system; levator palpebrae superioris [muscle]; linear profile scan; link power status; lipase; lipopolysaccharide; Lovastatin Pravastatin Study
• Lps  liters per second
• LPSR  lipopolysaccharide receptor
• LPT  Language Proficiency Test; lipotropin
• LPTP  Laboratory Proficiency Test Program [Canada]
• LPV  lapine parvovirus; left portal view; left pulmonary veins; lopinavir
• LPVP  left posterior ventricular preexcitation
• LPW  lateral pharyngeal wall
• Lpw  lumens per watt
• LPX, Lp-X  lipoprotein-X
• LPyV  lymphotropic polyomavirus
• LQ  linear quadratic; longevity quotient; lordosis quotient; lower quadrant
• LQS  Lexicon Query Service Specifications
• LQT  long QT [syndrome]
• LQTS  long QT syndrome
• LR  labeled release; laboratory references; laboratory report; labor room; lactated Ringer's [solution]; large reticulocyte; latency reaction; latency relaxation; lateral rectus [muscle]; lateral retinaculum; left hand; left-handed [person]; left rotation; level of recommendation; level of risk; light reaction; light reflex; likelihood ratio; limb reduction [defect]; limit of reaction; livedo reticularis; local recurrence; logistic regression; low renin; lymphocyte recruitment
• L-R  left to right
• L/R  left-to-right [ratio]
• LR[+]  positive likelihood ratio
• LR[-]  negative likelihood ratio
• L&R  left and right
• Lr  lawrencium; limes reacting dose [the least amount of toxin which will produce a reaction]
• L_r  limes reacting dose [the least amount of toxin which will produce a reaction]
• LRA  local relevance aggregation [algorithm for insulin therapy]; low right atrium
• LRC  learning resource center; lipid research clinic; lower rib cage
• LRC-CDPT  Lipid Research Clinics Coronary Drug Project Trial
• LRC-CPPT  Lipid Research Clinics Coronary Primary Prevention Trial
• LRCMB  Laboratory of Retinal Cell and Molecular Biology
• LRC-MFS  Lipid Research Clinics Mortality Follow-Up Study
• LRCP  Licentiate of the Royal College of Physicians; low-risk chest pain
• LRCS  Licentiate of the Royal College of Surgeons
• LRCSE  Licentiate of the Royal College of Surgeons, Edinburgh
• LRD  living related donor
• LRDT  living related donor transplant
• LRE  lamina rara externa; leukemic reticuloendotheliosis; lymphoreticuloendothelial
• LREC  language resources and evaluation
• LREH  low renin essential hypertension
• LRES  long-range evaluation system
• LRes  limited resuscitation
• Lretro  longitudinal retrospective [trial]
• LRF  latex and resorcinol formaldehyde; liver residue factor; luteinizing hormone-releasing factor
• LRG  leucine-rich glycoprotein
• LRH  likelihood ratio for heterogeneity; luteinizing hormone-releasing hormone
• LRI  lamina rara interna; lower respiratory [tract] illness; lower respiratory [tract] infection; lymphocyte reactivity index
• LRL  lower [heart] rate limit
• LRLT  living-related donor transplantation
• LRM  left radical mastectomy; logistic regression model
• LRMP  last regular menstrual period
• LRN  Laboratory Response Network; lateral reticular nucleus
• LROP  lower radicular obstetrical paralysis
• LRP  lichen ruber planus; linear resolution pattern; lipoprotein receptor-related protein; long-range planning
• LRPC  Long Range Planning Committee [National Cancer Institute]
• Lr-PET  low resolution positron emission tomography
• LRQ  lower right quadrant
• LRR  labyrinthine righting reflex; leucine-rich repeat; light reflection rheography; local regional recurrence; lymph return rate
• LRS  laboratory results; lactated Ringer solution; lateral recess stenosis; lateral recess syndrome; low rate of stimulation; lumboradicular syndrome
• LRSDS  long range standoff detection system
• LRSF  lactating rat serum factor; liver regenerating serum factor
• LRSS  late respiratory systemic syndrome
• LRT  lateral reticular nucleus; living related transplant; local radiation therapy; long terminal repeat; Lovastatin Restenosis Trial; lower respiratory tract
• LRTI  lower respiratory tract illness; lower respiratory tract infection
• LRV  Lato River virus; left renal vein; Leishmania RNA virus
• LS  lateral septum; lateral suspensor; leader sequence; learning system; least; left sacrum; left septum; left side; legally separated; Leigh syndrome; leiomyosarcoma; length of stay; Leriche syndrome; Letterer-Siwe [disease]; Licentiate in Surgery; life sciences; light scanning; light scattering [technique]; light-sensitive, light sensitivity; light sensor; light sleep; Likert score; liminal sensation; linear scanning; linear scleroderma; lipid synthesis; liver and spleen; long sleep; longitudinal section; longitudinal study; Lowe syndrome; low-sodium [diet]; lower strength; lumbar spine; lumbosacral; lung surfactant; lymphosarcoma
• L-S  Letterer-Siwe [disease]; lipid-saccharide
• L:S  lecithin:sphingomyelin [ratio]
• L/S  lactase/sucrase [ratio]; lecithin/ sphingomyelin [ratio]; lipid/saccharide [ratio]; longitudinal section; lumbosacral
• L&S  liver and spleen
• LSA  left sacro-anterior [fetal position]; left subclavian artery; leukocyte-specific activity; lichen sclerosus et atrophicus; lymphosarcoma
• LS&A  lichen sclerosus et atrophicus
• LSAH  Longitudinal Study of Astronaut Health
• LSANA  leukocyte-specific antinuclear antibody
• LSA/RCS  lymphosarcoma-reticulum cell sarcoma
• LSB  least significant bit; left sternal border; left scapular border; long spike burst; lower sternal border; lumbar sympathetic block
• LSBE  low-segment Barrett's esophagus
• LS-BMD  lumbar spine bone mineral density
• LSC  last sexual contact; late systolic click; least significant change; left side colon cancer; left subclavian; lichen simplex chronicus; liquid scintillation counting; liquid-solid chromatography; locus subcoeruleus
• LSc  local scleroderma
• LScA  left scapulo-anterior [fetal position]
• LSCL  lymphosarcoma cell leukemia
• LSCM  laser scanning confocal microscopy
• LScP  left scapulo-posterior [fetal position]
• LSCS  lower segment cesarean section
• LSCT  lung cancer screening test
• LSCVP  left subclavian central venous pressure
• LSD  laryngeal sound discrimination; least significant difference; least significant digit; low-sodium diet; lysergic acid diethylamide
• LSD-25  lysergic acid diethylamide
• LSDIS  large scale distributed information system
• LSE  least squares error; left sternal edge
• LSect  longitudinal section
• LSEP  left somatosensory evoked potential; lumbosacral somatosensory evoked potential
• LSER  linear solvation energy relationship
• LSF  linear spread function; low saturated fat; lymphocyte-stimulating factor
• LSFB  least squares forward backward
• LSG  labial salivary gland; losigamone
• LSGP  leukocyte sialoglycoprotein
• LSH  lutein-stimulating hormone; lymphocyte-stimulating hormone
• LSHTM  London School of Hygiene and Tropical Medicine
• LSI  large-scale integration; latent semantic indexing; life satisfaction index; List of Serials Indexed [NLM]; lumbar spine index
• LSIL  low-grade intraepithelial lesion
• LSK  liver, spleen, kidneys
• LSKM  liver-spleen-kidney-megaly
• LSL  left sacrolateral [fetal position]; left short leg; lymphosarcoma [cell] leukemia
• LSM  laser scanning microscopy; late systolic murmur; least square mean; least square matching [algorithm]; lymphocyte separation medium; lysergic acid morpholide
• LSN  large scale networking; left substantia nigra
• LSNWG  Large Scale Networking Working Group
• LSO  lateral superior olive; left salpingo-oophorectomy; left superior oblique; lumbosacral orthosis
• LSP  left sacroposterior [fetal position]; linguistic string project; liver-specific protein; lymphocyte-specific protein
• LSp  life span
• LS PACS  low-speed picture archive and communication system
• L-Spar  asparaginase (Elspar)
• LSP-MLP  linguistic string project-medical language processor
• LSPV  left superior pulmonary vein
• LSR  lanthanide shift reagent; lecithin/ sphingomyelin ratio; left superior rectus [muscle]; liver/spleen ratio
• LSRA  low septal right atrium
• LSRO  Life Sciences Research Office
• LSS  latest starting shift; Life Span Study; life support station; liver-spleen scan; lumbar spinal stenosis; lumbosacral spine
• LSSA  lipid-soluble secondary antioxidant
• LS-SEDUHS  Longitudinal Study on Socio-Economic Differences in Utilization of Health Services
• LS-SEHD  Longitudinal Study on Socio-Economic Health Differences
• LSSP-PCR  low-stringency single specific primer polymerase chain reaction
• LST  lateral spinothalamic tract; lateral spreading tumor; left sacrotransverse [fetal position]; life-sustaining treatment
• LSTAT  life support for trauma and transport
• LSTL  laparoscopic tubal ligation
• LSU  lactose-saccharose-urea [agar]; life support unit
• LSV  lateral sacral vein; left subclavian vein; lesser saphenous vein; Lone Star virus; longitudinal sound velocity
• LSVC  left superior vena cava
• LSVT  large scale vocabulary test; left saphenous vein thrombophlebitis
• LSWA  large amplitude slow wave activity
• LT  heat-labile toxin; laboratory technology/technologist; laminar tomography; Laplace transform; left; left thigh; left thoracic; less than; lethal time; leukotriene; Levin tube; levothyroxine; light; line termination; long-term; low temperature; lumbar traction; lymphocytic thyroiditis; lymphocytotoxin; lymphotoxin; syphilis [lues] test
• L-T3  L-triiodothyronine
• L-T4  L-thyroxine
• Lt  left; light; low tension
• LTA  leukotriene A; lipoate transacetylase; lipotechoic acid; local tracheal anesthesia; long-term archives; lost-time accident
• L-TAP  Lipid Treatment Assessment Project
• LTAS  lead tetra-acetate Schiff
• LTB  larparoscopic tubal banding; laryngotracheobronchitis; leukotriene B
• LTBI  latent tuberculosis infection
• LTC  large transformed cell; leukotriene C; lidocaine tissue concentration; long-term care; lysed tumor cell
• L1TC  level 1 trauma center
• LTCF  long-term care facility
• LTCIC, LTC-IC  long-term culture-initiating cell
• LTCS  low transverse cervical section
• LTD  Laron-type dwarfism; laterodorsal tegmental [nucleus]; leukotriene D; long-term [cortical] depression; long-term disability
• LTE  laryngotracheoesophageal; leukotriene E
• LT-ECG  long-term electrocardiography
• LTF  lactotransferrin; lateral tegmental field; lipotropic factor; lymphocyte-transforming factor
• LTFU  lost to follow-up
• LTG  lamotrigine; long-term goal; low-tension glaucoma
• LTH  lactogenic hormone; local tumor hyperthermia; low temperature holding; luteotropic hormone
• LTI  lupus-type inclusions
• LTK  laser thermokeratoplasty; leukocyte tyrosine kinase
• Lt lat  left lateral
• LTLT  low-temperature, long-time [pasteurization]
• LTM  long-term memory
• LTN  lateral telangiectatic nevus
• LTNP  long-term non-progressor
• LTO₂  long-term oxygen therapy
• LTOT  long-term oxygen therapy
• LTP  laryngotracheoplasty; lateral thigh perforator; Learning Technologies Project; leukocyte thromboplastin; lipid transfer protein; long-term potentiation; L-tryptophan
• LTPA  leisure-time physical activity
• LTPP  lipothiamide pyrophosphate
• LTR  laryngotracheal reconstruction; location transactivating region; long terminal repeat
• LTRA  leukotriene receptor antagonist; long-term repopulating ability
• LTS  laboratory tests; least trimmed squares [method]; long-term survival; long-term survivor
• LTST  low-temperature stabilization technology
• LTT  lactose tolerance test; leucine tolerance test; limited treadmill test; lymphocyte transformation test
• LTV  lung thermal volume
• LTW  Leydig-cell tumor in Wistar rat
• LTX  liver transplantation
• LU  left upper [limb]; loudness unit; Lupron; lytic unit
• Lu  lutetium
• L&U  lower and upper
• LUC  large unstained cell; luciferase
• LUCL  lateral ulnar collateral ligament
• LUE  left upper extremity
• LUF  lesion underdose factor [radiosurgery]; luteinized unruptured follicle
• LUFS  luteinized unruptured follicle syndrome
• LUKV  Lukuni virus
• LUL  left upper eyelid; left upper limb; left upper lobe; left upper lung
• Lumb  lumbar
• LUMD  lowest usual maintenance dose
• LUMO  lowest unoccupied molecular orbital
• LUMPS  liver unit management protocol system
• LUO  left ureteral orifice
• LUOQ  left upper outer quadrant

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