Browse Medical Abbreviations
L
| L | length; liter (0.264172 US gallon); lung; lateral; left; ligament; lumbar |
| L Cx | left circumflex |
| L&A | light and accommodation |
| L&B | laryngoscopy and bronchoscopy |
| L&D | labor and delivery; light and distance |
| L&U | lower and upper |
| L&W | living and well |
| L-1 | first lumbar vertebra |
| L-2 | second lumbar vertebra |
| L-3 | third lumbar vertebra |
| L-4 | fourth lumbar vertebra |
| L-5 | fifth lumbar vertebra |
| L-dopa | Levodopa |
| L-R | left to right |
| L/min | liters per minute |
| L/Min L/m | liters per minute |
| L/R | left to right |
| L/S ratio | lecithin to sphingomyelin ratio |
| La | La antigen; lactic acidosis; lanthanum [element] |
| LA | long-acting (medicine); local anesthesia; left atrium/atrial; lactic acid; left arm |
| LAA | left atrial appendage |
| lab | laboratory |
| LABA | long-acting beta agonist |
| LAC | left antecubital; lupus anticoagulant |
| LACC | Lupus Activity Criteria Count |
| lact | lactating |
| LAD | left axis deviation; left anterior descending; lymphadenopathy; leukocyte adhesion deficiency |
| LADD | diagonal branch of the left anterior; lacrimo-auriculo-dento-digital |
| LAE | left atrial enlargement |
| LAFa | left anterior forearm |
| LAFB | left anterior fascicular block |
| LAHB | left anterior hemiblock |
| LAIV | live attenuated influenza vaccine |
| LAM | lymphangioleiomyomatosis; lactation amenorrhea method |
| LAO | left anterior oblique |
| lap | laparoscop(y/ic) |
| LAP | leukocyte alkaline phosphatase; left atrial pressure |
| laryngol | laryngological |
| LASER | light amplification by stimulated emission of radiation |
| LASIK | laser assisted in situ keratomileusis |
| LAT | left anterolateral thigh |
| lat. | lateral |
| LATS | long-acting thyroid stimulator |
| LAVH | laparoscopic assisted vaginal hysterectomy |
| LAVI | left atrial volume index |
| lax | loose; laxative |
| LB | live birth; lower body |
| lb | pound |
| LBBB | left bundle branch block |
| LBC | liquid-based cytology |
| LBP | low back pain |
| lbs | pounds |
| LBW | low birth weight |
| LC-MS | liquid chromatography mass spectrometry |
| LCA | left coronary artery |
| LCAD | long-chain acyl-CoA dehydrogenase deficiency |
| LCD | liquor carbonis detergens |
| LCF | left cubital fossa |
| LCH | Langerhans cell histiocytosis |
| LCIS | lobular carcinoma in situ |
| LCL | lateral collateral ligament |
| LCM | left costal margin; lymphocytic choriomeningitis; laser capture microdissection |
| LCMV | lymphocytic choriomeningitis virus |
| LCPD | Legg-Calve-Perthes disease |
| LCRs | locus control regions |
| lcSSc | limited cutaneous systemic sclerosis |
| LCSW | Licensed Clinical Social Worker |
| LCX | left circumflex |
| LD | lethal dose; lactic dehydrogenase; lactate dehydrogenase; left deltoid; learning disability |
| LD50 | lethal dose at which 50% of animal test group dies |
| LDD | Lhermitte-Duclos disease |
| LDDB | London Dysmorphology Database |
| LDH | lactate dehydrogenase |
| LDL | low-density lipoprotein |
| LDLR | low-density lipoprotein receptor |
| LDR | labor, delivery, recovery |
| LDRP | labor, delivery, recovery, postpartum room |
| LDUH | low-dose-unfractionated heparin |
| LE | left eye; lower extremity; lupus erythematosus |
| LE cells | lupus erythematosus cells |
| LEEP | loop electrosurgical excision procedure |
| LEF | leflunomide |
| LEP | laparoscopic extraperitoneal approach; limited English proficiency |
| LES | lower esophageal sphincter |
| LET | lidocaine, epinephrine, tetracaine |
| LETM | longitudinally extensive transverse myelitis |
| LETZ | loop electrosurgical excision procedure |
| Leu | leucine |
| LFA | left forearm |
| LFD | low fat diet |
| LFT | liver function test |
| LFTS | liver function test series |
| lg | large |
| LG | left gluteal/gluteus |
| LGA | large for gestational age |
| LGBT | lesbian, gay, bisexual, transgender |
| LGBTQ | lesbian, gay, bisexual, transgender, queer |
| LGI | lower gastrointestinal |
| LGL | Lown Ganong Levine syndrome; large granular lymphocyte |
| LGM | left upper outer gluteus maximus |
| LGMD | limb-girdle muscular dystrophy |
| LGSIL | low-grade squamous, intra-epithelial lesion |
| LGV | lymphogranuloma venereum |
| LH | left hand; luteinizing hormone |
| LHON | Leber hereditary optic neuropathy |
| LHRH | luteinizing hormone-releasing hormone |
| LHS | long handled sponge |
| Li | lithium [element] |
| LIF | left iliac fossa; leukemia inhibitory factor |
| LIFA | left inner forearm |
| lig | ligament |
| LIH | left inguinal herniorrhaphy |
| LIMA | left internal mammary artery |
| LINCL | late infantile neuronal ceroid lipofuscinosis |
| LIP | lymphocytic interstitial pneumonia |
| liq | fluid; liquid |
| LIQ | lower inner quadrant |
| LITT | laser-induced interstitial thermal therapy |
| LKS | Landau-Kleffner syndrome; liver, kidney, and spleen |
| LL | left lateral; left leg |
| LLB | long leg brace |
| LLC | long leg cast |
| LLE | left lower extremity |
| LLL | left lower (lung) lobe |
| LLQ | left lower quadrant (abdomen) |
| LLSB | left lower sternal border |
| LMA | laryngeal mask airway |
| LMCA | left main coronary artery |
| LMD | local medical doctor |
| LMHC | Licensed Mental Health Counselor |
| LML | left mediolateral |
| LMN | lower motor neuron |
| LMO | living modified organism |
| LMP | last menstrual period |
| LMPS | lethal multiple pterygium syndrome |
| LMWH | low molecular weight heparin; low-molecular-weight heparin |
| LN | lymph node; lobular neoplasia; lupus nephritis |
| LNMP | last normal menstrual period |
| LOA | leave of absence; left occiput anterior |
| LOB | loss of balance |
| LOC | loss of consciousness; level of consciousness |
| LoChol | low cholesterol |
| LOF | loss of function |
| LOFA | left outer forearm |
| LOH | loss of heterozygosity |
| LOI | loss of imprinting |
| LOM | loss/limitation of motion |
| LOMSA | left otitis media, suppurative, acute |
| LOMSCH | left otitis media, suppurative, chronic |
| LOOP | loop electrosurgical excision procedure |
| LOP | left occiput posterior |
| LOQ | lower outer quadrant |
| LOR | loss of resistance |
| LOS | length of stay |
| lot | lotion |
| LOT | left occiput transverse |
| LP | lumbar puncture |
| Lp(a) | Lipoprotein(a) |
| LPA | lasting power of attorney |
| LPcP | light perception with projection |
| LPD | luteal phase defect |
| LPFB | left posterior fascicular block |
| LPI | laser peripheral iridotomy |
| LPM | liters per minute (oxygen) |
| LPN | licensed practical nurse |
| LPO | left posterior oblique |
| LPS | lipopolysaccharide |
| LPT | licensed physical therapist |
| LQR/LSR | locked quiet room/locked seclusion room |
| LQTS | long QT syndrome |
| LR | likelihood ratio; lactated ringer (solution); Labor Room; lateral rectus |
| LRI | lower respiratory infection |
| LRNE | low risk nutrition education |
| LRSB | lower right sternal border |
| LRT | lower respiratory tract |
| LRTI | lower respiratory tract infection |
| LS | lumbosacral |
| LS ratio | lecithin-sphingomyelin ratio |
| LSB | left sternal border |
| LSC | left subclavian |
| LSCS | lower segment Caesarean section |
| LSD | lysergic acid diethylamide |
| LSIL | low-grade squamous intraepithelial lesion |
| LSK | liver, spleen, kidneys |
| LSO | left salpingo-oophorectomy |
| LT | left tilt; leukotriene |
| Lt | left |
| LTB | laryngotracheobronchitis |
| LTBI | latent tuberculosis infection |
| LTC | long-term culture; low transverse cervical (c/s); long-term condition; long-term care (facility) |
| LTCF | long-term care facility |
| LTD | lowest tolerated dose |
| LTE | less than effective; life-threatening event |
| LTG | long-term goals |
| LTH | luteotropic hormone |
| LTL | laparoscopic tubal ligation |
| LTM | long-term memory |
| LTOT | long-term oxygen therapy |
| LTP | long-term potentiation |
| LTR | long terminal repeat; laryngotracheal reconstruction |
| LTRA | leukotriene receptor antagonist |
| LTV | long-term variability |
| ltx | latex |
| Lu | lutetium [element] |
| LUA | left upper arm |
| LUD | left uterine displacement |
| LUE | left upper extremity |
| LUL | left upper (lung) lobe |
| LUQ | left upper quadrant (abdomen) |
| LUT | left upper thigh |
| LV | live vaccine; left ventricle |
| LVA | left ventricular aneurysm |
| LVAD | left ventricular assist device |
| LVEDD | left ventricular end-diastolic diameter |
| LVEDP | left ventricular end-diastolic pressure |
| LVEF | left ventricular ejection fraction |
| LVF | left ventricular function; left ventricular failure |
| LVG | left ventriculogram |
| LVH | left ventricular hypertrophy |
| LVL | left vastus lateralis |
| lvl | level |
| LVM | left ventricular mass |
| LVN | licensed vocational nurse |
| LVOT | left ventricular outflow tract |
| LVRS | lung volume reduction surgery |
| LWD | living with disease; Leri-Weill dyschondrosteosis |
| LWOT | left without treatment |
| LWS | low wall suction |
| LXT | exotropia (left) |
| lymphs | lymphocytes |
| Lys | lysine |
| lytes | electrolytes |
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Abbreviations vary by context and institution. Many abbreviations have alternate or newer meanings not reflected in this set. The abbreviations on this page should not be considered complete.