List of Medical Abbreviations: L

Sortable table
Abbreviation Meaning
L leukocytes
lumbar vertebrae
L&D labor and delivery
LA left atrium
local anesthetic
LAAM L-alpha-acetylmethadol
Lab laboratory
LABA long acting beta agonist
LABBB left anterior bundle branch block
LAD left anterior descending (a coronary artery)
leukocyte adhesion deficiency
left axis deviation (see electrocardiogram)
LAE left atrial enlargement
LAH left anterior hemiblock
LAHB left anterior hemiblock
Lam laminectomy
LAP leukocyte alkaline phosphatase
Lap laparotomy
Lap appy laparoscopic appendectomy
LAR low anterior resection
LARP leftanterior, right → posterior (path of the vagi as they wander from thorax to abdomen)
LAS lymphadenopathy syndrome
Lat lateral
pound or pounds (mass)
LBBB left bundle branch block
LBO large bowel obstruction
LBP low back pain
LBW low birth weight
LCA left coronary artery
LCHAD long-chain 3-hydroxyacyl-coenzyme A dehydrogenase
LCIS lobular carcinoma in situ
LCM lymphocytic meningitis
LCMV lymphocytic choriomeningitis virus
LCPD Legg-Calvé-Perthes disease
LCV leukocytoclastic vasculitis
LCX left circumflex artery
L&D labor and delivery (see childbirth)
LDH lactate dehydrogenase
LDL low-density lipoprotein
LDL-C low-density lipoprotein cholesterol
L-DOPA levo-dihydroxyphenylalanine
LEC lupus erythematosus cell
LEEP loop electrical excision procedure
LES lower esophageal sphincter
lupus erythematosus systemicus
LE lupus erythematosus (in German lupus erythematodes)
lower extremity (human leg)
leu leukocytes
LFT liver function test
LGA large for gestational age
LGL Lown-Ganong-Levine syndrome
LGM lymphogranulomatosis maligna
LGSIL low-grade squamous intraepithelial lesion
LGV lymphogranuloma venereum
LH luteinizing hormone
LHC left heart catheterization
LHRH luteinizing hormone releasing hormone
Lig ligament
LIH left inguinal hernia
LLD leg length discrepancy
LLE left lower extremity
LLETZ large loop excision of the transformation zone
LLL left lower lobe
LLQ left lower quadrant
LM left main
LMA left mentoanterior (fetal position)
laryngeal mask airway
LMCA left main coronary artery
LMD local medical doctor
LMP last menstrual period—first day of the menstrual period prior to conceiving, used to calculate expected date of delivery (EDD)
LMWH low molecular weight heparin
LN lymph node
LNG levonorgestrel
LOA left occipitoanterior (fetal position)
lysis of adhesions
LOC loss of consciousness (see unconsciousness)
level of consciousness (e.g., "altered LOC from head trauma")
LOF leakage of fluid
LOL little old lady (often LOL in NAD—see House of God)
LOP Left Occiput Posterior - Fetal position
LORTA loss of resistance to air (in anesthesiology; when placing epidural, LORTA indicates entrance of needle to epidural space)
LOS length of stay
Lot lotion
Left Occiput Transverse - Fetal position
Lp lipoprotein
LP lumbar puncture
LPH left posterior hemiblock (see heart block)
LPL lipoprotein lipase
L/S lecithin to sphingomyelin ratio
LSB left sternal border
LSIL low-grade squamous intraepithelial lesion
LR lactated Ringer's solution
LRTI lower respiratory tract infection
LT heat-labile enterotoxin
LTAC long-term acute care
LTCS low transverse cesarean section
LUL left upper lobe (of lung)
LUQ left upper quadrant (of abdomen)
LUS lower uterine segment
LUTS lower urinary tract symptoms
LV left ventricle
LVAD left ventricular assist device
LVEDP left ventricular end diastolic pressure
LVEF left ventricular ejection fraction
LVF left ventricular failure
LVH left ventricular hypertrophy
LVOT left ventricular outflow tract
LWBS left without being seen
Lx of ch laxative of choice
Ly lymphocytes
lytes electrolytes
Medical abbreviations
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