List of medical abbreviations: L

Sortable table
Abbreviation Meaning
Lleukocytes
lumbar vertebrae (L1 to L5)
L&Dlabor and delivery
LAleft atrium
lymphadenopathy
local anesthetic
LAAML-alpha-acetylmethadol
Lablaboratory (in health care, usually referring to clinical laboratory)
LABAlong-acting beta agonist
LABBBleft anterior bundle branch block
Laclaceration
lactate
LADleft anterior descending (a coronary artery)
leukocyte adhesion deficiency
left axis deviation (see electrocardiogram)
lymphadenopathy
LAEleft atrial enlargement
LAHleft anterior hemiblock
LAHBleft anterior hemiblock
Lamlaminectomy
LANlymphadenopathy
LAPleukocyte alkaline phosphatase
Laplaparotomy
Lap appylaparoscopic appendectomy
LARlow anterior resection
LARPleft → anterior, right → posterior (path of the vagi as they wander from thorax to abdomen)
LASlymphadenopathy syndrome
Latlateral
lb
LB		pound or pounds (mass)
LBBBleft bundle branch block
LBOlarge bowel obstruction
LBPlow back pain
LBWlow birth weight
LCAleft coronary artery
LCHADlong-chain 3-hydroxyacyl-coenzyme A dehydrogenase
LCISlobular carcinoma in situ
LCMlymphocytic meningitis
LCMVlymphocytic choriomeningitis virus
LCPLiverpool Care Pathway for the Dying Patient
LCPDLegg–Calvé–Perthes disease
LCVleukocytoclastic vasculitis
LCXleft circumflex artery
L&Dlabor and delivery
LDHlactate dehydrogenase
LDLlow-density lipoprotein
LDL-Clow-density lipoprotein cholesterol
L-DOPAlevo-dihydroxyphenylalanine
LEClupus erythematosus cell
LEEPloop electrical excision procedure
LESlower esophageal sphincter
lupus erythematosus systemicus
LElupus erythematosus
lower extremity (human leg)
leuleukocytes
LFTliver function test
LGAlarge for gestational age
LGLLown–Ganong–Levine syndrome
LGMlymphogranulomatosis maligna
LGSILlow-grade squamous intraepithelial lesion
LGVlymphogranuloma venereum
LHluteinizing hormone
lightheadedness
LHCleft heart catheterization
LHRHluteinizing hormone–releasing hormone
Ligligament
LIHleft inguinal hernia
LLDleg length discrepancy
LLEleft lower extremity
LLETZlarge loop excision of the transformation zone
LLLleft lower lobe
LLQleft lower quadrant
LMleft main
LMAleft mentoanterior (fetal position)
laryngeal mask airway
LMCAleft main coronary artery
LMDlocal medical doctor
LMPlast menstrual period—first day of the menstrual period
low malignant potential
LMWHlow-molecular-weight heparin
LNlymph node
Logical Observation Identifiers Names and Codes (LOINC)
LNDlymph node dissection
LNGlevonorgestrel
LNIlymph node involvement
LOAleft occipitoanterior (fetal position)
level of activity
lysis of adhesions

Loss of Appetite

LOCloss of consciousness
level of consciousness (e.g., "altered LOC from head trauma")
LOFleakage of fluid
LOHloss of heterozygosity
LOIloss of imprinting
LOLlittle old lady (often LOL in NAD—see House of God)
lymph-obligatory load
LOMlimitation of motion
LOPleft occiput posterior (fetal position)
LORTAloss of resistance to air (in anesthesiology; when placing epidural, LORTA indicates entrance of needle to epidural space)
LOSlength of stay
Lotlotion
LOTleft occiput transverse (fetal position)
Lplipoprotein
LPlumbar puncture
LPHleft posterior hemiblock (see heart block)
LPLlipoprotein lipase
LPPlichen planopilaris
LQTSlong QT syndrome
L/Slecithin-to-sphingomyelin ratio
LSlichen sclerosus
Lynch syndrome
LSAlichen sclerosis et atrophicus
LSBleft sternal border
LSCSLower segment Caesarean section
LSCTAlung sounds clear to auscultation
LSILlow-grade squamous intraepithelial lesion
LSTlaterally spreading tumor
LRlactated Ringer's solution
LRINECLaboratory Risk Indicator for Necrotizing Soft Tissue Infections Score
LRTIlower respiratory tract infection
LTheat-labile enterotoxin
LTAClong-term acute care
LTCSlow transverse cesarean section
LULleft upper lobe (of lung)
LUQleft upper quadrant (of abdomen)
LUSlower uterine segment
LUTSlower urinary tract symptoms
LVleft ventricle
LVADleft ventricular assist device
LVEDPleft ventricular end diastolic pressure
LVEFleft ventricular ejection fraction
LVFleft ventricular failure
LVHleft ventricular hypertrophy
LVOTleft ventricular outflow tract
LVPLarge volume paracentesis
LWBSleft without being seen
Lx of chlaxative of choice
Lylymphocytes
lyteselectrolytes
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