+ Sortable table Abbreviation Meaning L leukocytes lumbar vertebrae (L1 to L5) L&D labor and delivery LA left atrium lymphadenopathy local anesthetic LAAM L-alpha-acetylmethadol Lab laboratory (in health care, usually referring to clinical laboratory) LABA long-acting beta agonist LABBB left anterior bundle branch block Lac laceration lactate LAD left anterior descending (a coronary artery) leukocyte adhesion deficiency left axis deviation (see electrocardiogram) lymphadenopathy LAE left atrial enlargement LAH left anterior hemiblock LAHB left anterior hemiblock Lam laminectomy LAN lymphadenopathy LAP leukocyte alkaline phosphatase Lap laparotomy Lap appy laparoscopic appendectomy LAR low anterior resection LARP left → anterior, right → posterior (path of the vagi as they wander from thorax to abdomen) LAS lymphadenopathy syndrome Lat lateral lb LB 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 LCP Liverpool Care Pathway for the Dying Patient LCPD Legg–Calvé–Perthes disease LCV leukocytoclastic vasculitis LCX left circumflex artery L&D labor and delivery 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 lower extremity (human leg) leu leukocytes LFT liver function test LGA large for gestational age LGL Lown–Ganong–Levine syndrome LGM lymphogranulomatosis maligna LGMD limb-girdle muscular dystrophy LGSIL low-grade squamous intraepithelial lesion LGV lymphogranuloma venereum LH luteinizing hormone lightheadedness 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 most recent menstrual period) low malignant potential LMWH low-molecular-weight heparin LN lymph node Logical Observation Identifiers Names and Codes (LOINC) LND lymph node dissection LNG levonorgestrel LNI lymph node involvement LOA left occipitoanterior (fetal position) level of activity lysis of adhesions Loss of Appetite LOC loss of consciousness level of consciousness (e.g., "altered LOC from head trauma") LOF leakage of fluid LOH loss of heterozygosity LOI loss of imprinting LOL little old lady (often LOL in NAD—see House of God)lymph-obligatory load LOM limitation of motion 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 LOT left occiput transverse (fetal position) Lp lipoprotein LP lumbar puncture LPH left posterior hemiblock (see heart block) LPL lipoprotein lipase LPP lichen planopilaris LQTS long QT syndrome L/S lecithin-to-sphingomyelin ratio LS lichen sclerosus Lynch syndrome LSA lichen sclerosis et atrophicus LSB left sternal border LSCS Lower segment Caesarean section LSCTA lung sounds clear to auscultation LSIL low-grade squamous intraepithelial lesion LST laterally spreading tumor LR lactated Ringer's solution LRINEC Laboratory Risk Indicator for Necrotizing Soft Tissue Infections Score 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 LVNC left ventricular noncompaction (see noncompaction cardiomyopathy) LVP Large volume paracentesis LWBS left without being seen Lx of ch laxative of choice lx investigations Ly lymphocytes lytes electrolytes

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