Internal Medicine Acronyms

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Internal Medicine Alphabet – L

S. No	Acronyms	Full Form	Short Explanation	Practical Example
L001	LAD	Left Anterior Descending (artery)	Major coronary artery supplying heart.	LAD blockage causes anterior MI.
L002	LFT	Liver Function Test	Blood tests assessing liver health.	Elevated LFTs in hepatitis.
L003	LDL	Low-Density Lipoprotein	“Bad cholesterol” linked to heart disease.	Statins reduce LDL levels.
L004	LDH	Lactate Dehydrogenase	Enzyme marker of tissue damage.	High LDH in hemolysis.
L005	LBBB	Left Bundle Branch Block	ECG abnormality in conduction system.	LBBB seen in cardiomyopathy.
L006	LVEF	Left Ventricular Ejection Fraction	Percentage of blood pumped by LV.	LVEF <40% indicates systolic HF.
L007	LFTs	Liver Function Tests	Enzyme/bilirubin profile of liver.	LFTs abnormal in cirrhosis.
L008	LCH	Langerhans Cell Histiocytosis	Rare disorder of dendritic cells.	LCH causes bone lesions in children.
L009	LCIS	Lobular Carcinoma In Situ	Breast cancer precursor lesion.	LCIS diagnosed on biopsy.
L010	LGL	Large Granular Lymphocyte	Subtype of immune cell.	LGL leukemia diagnosed with cytology.
L011	LMWH	Low-Molecular-Weight Heparin	Anticoagulant drug.	LMWH used in DVT treatment.
L012	LMP	Last Menstrual Period	Marker for pregnancy dating.	LMP recorded in gynecological history.
L013	LP	Lumbar Puncture	Procedure to obtain CSF sample.	LP done for meningitis suspicion.
L014	LP(a)	Lipoprotein(a)	Cholesterol particle with genetic risk.	High LP(a) linked to premature CAD.
L015	LPD	Low-Protein Diet	Dietary therapy in CKD.	LPD prescribed for stage 4 CKD.
L016	LPS	Lipopolysaccharide	Bacterial endotoxin causing inflammation.	LPS induces septic shock.
L017	LQT	Long QT (syndrome)	Cardiac conduction disorder.	LQT predisposes to torsades de pointes.
L018	LRA	Left Renal Artery	Blood vessel supplying left kidney.	LRA stenosis causes renovascular HTN.
L019	LRINEC	Laboratory Risk Indicator for Necrotizing Fasciitis	Scoring system to detect NF.	LRINEC score >6 suggests NF.
L020	LSCS	Lower Segment Cesarean Section	Common obstetric surgery.	LSCS performed for fetal distress.
L021	LSA	Lymphangiosarcoma	Malignant vascular tumor in lymphedema.	LSA seen in post-mastectomy patients.
L022	LSA	Left Subclavian Artery	Major branch of aortic arch.	LSA stenosis causes arm ischemia.
L023	LSM	Liver Stiffness Measurement	Fibroscan evaluation of fibrosis.	LSM indicates advanced cirrhosis.
L024	LSP	Lumbosacral Plexus	Nerve plexus in pelvis.	LSP injury causes leg weakness.
L025	LTBI	Latent Tuberculosis Infection	Dormant TB without symptoms.	LTBI treated with isoniazid.
L026	LTC	Long-Term Care	Chronic medical support for patients.	LTC required in dementia patients.
L027	LTOT	Long-Term Oxygen Therapy	Continuous oxygen therapy.	LTOT prescribed for COPD.
L028	LTP	Long-Term Potentiation	Neuronal plasticity phenomenon.	LTP studied in Alzheimer’s disease.
L029	LTX	Liver Transplant	Surgical replacement of diseased liver.	LTX performed for cirrhosis.
L030	LUQ	Left Upper Quadrant	Abdominal region housing spleen.	LUQ pain in splenic rupture.
L031	LVH	Left Ventricular Hypertrophy	Thickening of LV wall.	LVH on ECG in hypertension.
L032	LVOT	Left Ventricular Outflow Tract	Exit tract of LV to aorta.	LVOT obstruction in HCM.
L033	LVP	Left Ventricular Pressure	Hemodynamic measure of LV function.	LVP elevated in HF.
L034	LVO	Large Vessel Occlusion	Stroke due to blocked major artery.	LVO treated with thrombectomy.
L035	LVR	Left Ventricular Remodeling	Structural change in LV post-MI.	LVR minimized with ACE inhibitors.
L036	LVSD	Left Ventricular Systolic Dysfunction	Impaired pumping of LV.	LVSD treated with beta-blockers.
L037	LVT	Left Ventricular Thrombus	Clot within LV cavity.	LVT post-MI treated with anticoagulation.
L038	LWW	Lymphatic Water Wave	Pathological lymphatic flow.	LWW seen in lymphedema scans.
L039	LZP	Lorazepam	Benzodiazepine sedative.	LZP used for acute seizure control.
L040	LMA	Laryngeal Mask Airway	Airway device used in anesthesia.	LMA inserted during surgery.
L041	LNM	Lymph Node Metastasis	Spread of cancer to lymph nodes.	LNM staging critical in oncology.
L042	LND	Lymph Node Dissection	Surgical removal of nodes.	LND performed in breast cancer.
L043	LNT	Lymph Node Transfer	Surgical therapy for lymphedema.	LNT improves lymphatic drainage.
L044	LNR	Lymph Node Ratio	Ratio of positive to total nodes.	LNR predicts cancer prognosis.
L045	LAA	Left Atrial Appendage	Heart structure prone to thrombus.	LAA occlusion prevents AF strokes.
L046	LAL	Lysosomal Acid Lipase	Enzyme deficiency causes storage disease.	LAL deficiency leads to Wolman disease.
L047	LAM	Lymphangioleiomyomatosis	Rare cystic lung disease.	LAM treated with sirolimus.
L048	LAP	Leukocyte Alkaline Phosphatase	Enzyme test in blood disorders.	Low LAP in CML.
L049	LAR	Low Anterior Resection	Colorectal surgery.	LAR performed for rectal cancer.
L050	LAS	Left Atrial Size	Echocardiographic measure of LA volume.	Enlarged LAS in AF patients.

S. No	Acronyms	Full Form	Short Explanation	Practical Example
L051	LAT	Left Atrial Thrombus	Blood clot in left atrium.	LAT common in atrial fibrillation.
L052	LAE	Left Atrial Enlargement	Dilatation of left atrium.	LAE seen on ECG in mitral stenosis.
L053	LAH	Left Atrial Hypertension	Increased LA pressure.	LAH in left heart failure.
L054	LAMN	Low-Grade Appendiceal Mucinous Neoplasm	Rare tumor of appendix.	LAMN may cause pseudomyxoma peritonei.
L055	LAPC	Locally Advanced Pancreatic Cancer	Tumor not resectable but not metastatic.	LAPC treated with chemoradiation.
L056	LASIK	Laser-Assisted In Situ Keratomileusis	Eye surgery to correct vision.	LASIK performed for myopia.
L057	LASP	Leukocyte Adhesion-Associated Protein	Protein involved in cell adhesion.	LASP studied in immunology research.
L058	LATS	Long-Acting Thyroid Stimulator	Autoantibody stimulating thyroid.	LATS present in Graves’ disease.
L059	LAVH	Laparoscopic-Assisted Vaginal Hysterectomy	Minimally invasive uterine removal.	LAVH indicated for fibroids.
L060	LBW	Low Birth Weight	<2500g at birth.	LBW linked to neonatal mortality.
L061	LC	Lung Cancer	Malignant tumor of lungs.	LC diagnosed with biopsy.
L062	LCA	Left Coronary Artery	Major artery supplying heart.	LCA occlusion causes massive MI.
L063	LCAT	Lecithin-Cholesterol Acyltransferase	Enzyme in lipid metabolism.	LCAT deficiency leads to low HDL.
L064	LCHAD	Long-Chain 3-Hydroxyacyl-CoA Dehydrogenase	Enzyme in fatty acid oxidation.	LCHAD deficiency causes hypoglycemia.
L065	LCM	Lymphocytic Choriomeningitis	Viral infection of CNS.	LCM virus transmitted by rodents.
L066	LCNEC	Large Cell Neuroendocrine Carcinoma	Aggressive lung tumor.	LCNEC treated like small-cell carcinoma.
L067	LCP	Lateral Collateral Pathway	Alternative blood flow path.	LCP identified on angiography.
L068	LCR	Lactate/Creatinine Ratio	Biomarker of metabolic stress.	LCR elevated in shock.
L069	LCS	Lung Cancer Screening	Imaging-based early detection.	LCS with low-dose CT.
L070	LCT	Leydig Cell Tumor	Testicular tumor.	LCT produces testosterone.
L071	LD	Learning Disability	Neurological disorder of learning.	LD diagnosed in childhood.
L072	LDC	Liver-Derived Cell	Hepatic progenitor cell.	LDCs studied in regenerative medicine.
L073	LDD	Lumbar Disc Disease	Degeneration of spinal discs.	LDD causes back pain.
L074	LDI	Laser Doppler Imaging	Imaging for blood perfusion.	LDI used in burn depth assessment.
L075	LDLR	Low-Density Lipoprotein Receptor	Receptor for LDL particles.	LDLR mutation in familial hypercholesterolemia.
L076	LDN	Low-Dose Naltrexone	Off-label use for autoimmune disease.	LDN prescribed in MS patients.
L077	LDP	Left Diaphragmatic Paralysis	Weakness of left diaphragm.	LDP seen after cardiac surgery.
L078	LDR	Low-Dose Radiation	Minimal therapeutic radiation.	LDR used in brachytherapy.
L079	LDT	Lymphocyte Doubling Time	Measure of CLL progression.	Short LDT indicates aggressive disease.
L080	LE	Lupus Erythematosus	Autoimmune disease affecting multiple organs.	LE diagnosed with ANA positivity.
L081	LEE	Lupus Erythematosus Endocarditis	Cardiac complication of SLE.	LEE manifests as Libman-Sacks endocarditis.
L082	LEMS	Lambert-Eaton Myasthenic Syndrome	Neuromuscular autoimmune disorder.	LEMS causes proximal weakness.
L083	LET	Linear Energy Transfer	Radiation dosimetry term.	LET higher in proton therapy.
L084	LFA	Lymphocyte Function Assay	Test of immune competence.	LFA performed in transplant candidates.
L085	LFB	Luxol Fast Blue	Stain for myelin.	LFB used in neuropathology.
L086	LFC	Left Femoral Catheter	Central line in femoral vein.	LFC placed in emergencies.
L087	LFD	Low-Fat Diet	Nutritional intervention.	LFD prescribed in pancreatitis.
L088	LFG	Lung Function Graph	Spirometry chart.	LFG shows obstructive pattern.
L089	LFH	Left Frontal Hematoma	Brain hemorrhage in frontal lobe.	LFH seen after trauma.
L090	LFL	Left Frontal Lobe	Brain region for executive function.	Stroke in LFL causes speech difficulty.
L091	LFN	Leukotriene F4 Neutrophil	Inflammatory mediator.	LFN elevated in asthma.
L092	LFO	Low-Flow Oxygen	Minimal oxygen supplementation.	LFO delivered via nasal cannula.
L093	LFP	Local Field Potential	Brain electrical activity recording.	LFP studied in epilepsy.
L094	LFR	Left Femoral Region	Anatomical site.	LFR pain noted in hip arthritis.
L095	LFS	Li-Fraumeni Syndrome	Genetic cancer predisposition.	LFS due to TP53 mutation.
L096	LFTD	Liver Function Test Derangements	Abnormal LFT results.	LFTD common in viral hepatitis.
L097	LGA	Large for Gestational Age	Neonate >90th percentile weight.	LGA babies born to diabetic mothers.
L098	LGB	Lateral Geniculate Body	Thalamic visual relay nucleus.	Stroke in LGB causes vision loss.
L099	LGD	Low-Grade Dysplasia	Precancerous lesion.	LGD seen in Barrett’s esophagus.
L100	LGI	Lower Gastrointestinal	Refers to colon/rectum diseases.	LGI bleeding in diverticulosis.
L101	LGLA	Large Granular Lymphocytic Anemia	Chronic lymphoproliferative disorder.	LGLA diagnosed with flow cytometry.
L102	LGS	Lennox-Gastaut Syndrome	Severe epilepsy syndrome.	LGS treated with valproate.
L103	LGV	Lymphogranuloma Venereum	STI caused by Chlamydia trachomatis.	LGV presents with genital ulcers.
L104	LH	Luteinizing Hormone	Pituitary hormone for gonadal function.	LH surge triggers ovulation.
L105	LHRH	Luteinizing Hormone Releasing Hormone	Hypothalamic hormone.	LHRH agonists used in prostate cancer.
L106	LHV	Left Hepatic Vein	Major liver vein.	LHV seen on abdominal Doppler.
L107	LIA	Local Infiltration Anesthesia	Local anesthetic injection.	LIA used in minor surgery.
L108	LID	Lithium-Induced Diabetes	Diabetes insipidus due to lithium.	LID seen in bipolar patients.
L109	LIF	Leukemia Inhibitory Factor	Cytokine with multiple roles.	LIF studied in stem cell biology.
L110	LIG	Ligament	Connective tissue band.	ACL is a knee ligament.
L111	LIL	Left Iliac Lymph nodes	Nodes in iliac chain.	LIL enlarged in pelvic cancer.
L112	LIM	Lymphocyte Immunophenotyping	Classification of lymphocytes.	LIM used in leukemia typing.
L113	LIN	Low-Intermediate Nuclear grade	Tumor pathology classification.	LIN seen in urothelial carcinoma.
L114	LIP	Lymphocytic Interstitial Pneumonia	Rare lung disease.	LIP associated with HIV.
L115	LIR	Left Iliac Region	Lower abdominal quadrant.	LIR pain in diverticulitis.
L116	LIS	Lateral Internal Sphincterotomy	Surgery for anal fissure.	LIS relieves sphincter spasm.
L117	LIT	Low-Intensity Therapy	Mild therapeutic regimen.	LIT used in frail cancer patients.
L118	LIV	Left Iliac Vein	Major pelvic vein.	LIV thrombosis causes leg swelling.
L119	LJP	Localized Juvenile Periodontitis	Aggressive gum disease.	LJP requires periodontal therapy.
L120	LKA	Locked Knee Arthroplasty	Joint replacement complication.	LKA managed surgically.
L121	LLB	Lower Limb Bypass	Surgical revascularization.	LLB performed for PAD.
L122	LLC	Large Left Colon	Anatomical description.	LLC involved in diverticulitis.
L123	LLD	Leg Length Discrepancy	Orthopedic abnormality.	LLD corrected with shoe lifts.
L124	LLE	Left Lower Extremity	Refers to leg region.	LLE DVT common in immobile patients.
L125	LLL	Left Lower Lobe	Part of left lung.	LLL pneumonia common in aspiration.
L126	LLM	Left Lower Molar	Tooth location.	LLM extracted in dental abscess.
L127	LLN	Lower Limit of Normal	Statistical term in lab values.	LLN used in spirometry interpretation.
L128	LLO	Left Lateral Orbit	Eye socket region.	LLO fracture in trauma.
L129	LLP	Left Lower Pole	Kidney anatomical reference.	LLP stone detected on CT scan.
L130	LLR	Left Lateral Rectus	Eye muscle for abduction.	LLR palsy causes diplopia.
L131	LLS	Left Lateral Segment (of liver)	Anatomical liver region.	LLS resection in surgery.
L132	LLT	Long-Lasting Therapy	Extended duration medication.	LLT antipsychotics used in schizophrenia.
L133	LLV	Low-Level Viremia	Persistent low viral load.	LLV in HIV despite ART.
L134	LMAF	Left Middle Cerebral Artery Flow	Blood flow assessment.	LMAF measured on Doppler.
L135	LMB	Left Main Bronchus	Large airway.	LMB obstruction causes collapse.
L136	LMC	Left Main Coronary	Major coronary artery.	LMC occlusion is life-threatening.
L137	LMD	Leptomeningeal Disease	Cancer spread to meninges.	LMD common in leukemia/lymphoma.
L138	LME	Low Molecular Weight Epinephrine	Drug preparation type.	LME studied in pharmacology.
L139	LMF	Left Medial Frontal (lobe)	Brain region.	Stroke in LMF affects decision-making.
L140	LMN	Lower Motor Neuron	Spinal cord neuron controlling muscles.	LMN lesion causes flaccid paralysis.
L141	LMO	Left Middle Orbit	Eye structure region.	LMO trauma causes diplopia.
L142	LMPA	Last Menstrual Period Assessment	Tool in obstetrics.	LMPA helps calculate due date.
L143	LMS	Leiomyosarcoma	Malignant smooth muscle tumor.	LMS seen in uterus.
L144	LMT	Left Main Trunk (coronary)	Major coronary artery branch.	LMT stenosis treated with CABG.
L145	LMW	Low Molecular Weight	Refers to small molecule drugs.	LMW heparin widely used.
L146	LMY	Left Myocardium	Refers to LV wall.	LMY infarction seen on MRI.
L147	LNA	Locked Nucleic Acid	Modified oligonucleotide.	LNA used in antisense therapy.
L148	LNC	Local Nerve Conduction	Test for nerve integrity.	LNC study in neuropathy.
L149	LNDH	Lateral Neck Dissection, High	Surgery for thyroid cancer spread.	LNDH removes cervical nodes.
L150	LNG	Levonorgestrel	Hormonal contraceptive.	LNG used in IUDs.
L151	LNP	Lipid Nanoparticle	Drug delivery vehicle.	LNP used in mRNA vaccines.
L152	LNRH	Luteinizing Hormone Releasing Hormone	Hypothalamic peptide.	LNRH agonists treat infertility.
L153	LNS	Limbic Neuron Syndrome	Paraneoplastic encephalitis.	LNS presents with memory loss.
L154	LNTX	Liver Non-Transplant	Conservative management in liver disease.	LNTX chosen for early cirrhosis.
L155	LNZ	Linezolid	Antibiotic against resistant bacteria.	LNZ used in MRSA pneumonia.
L156	LOA	Left Occipital Artery	Blood vessel.	LOA seen in angiography.
L157	LOC	Level of Consciousness	Degree of alertness.	LOC decreased in coma.
L158	LOE	Level of Evidence	Research ranking system.	LOE A indicates strong evidence.
L159	LOH	Loss of Heterozygosity	Genetic abnormality.	LOH studied in cancer genetics.
L160	LOP	Left Occipital Pole	Brain region.	LOP infarct causes vision loss.
L161	LOR	Loss of Resistance	Technique in epidural placement.	LOR felt when needle enters epidural space.
L162	LOS	Length of Stay	Hospitalization duration.	LOS reduced by early discharge.
L163	LOT	Line of Therapy	Cancer treatment sequence.	LOT 2 means second-line therapy.
L164	LOW	Left Occipital White matter	Brain region.	LOW damage seen in MS.
L165	LPF	Low-Power Field	Microscopy view.	LPF used in urine microscopy.
L166	LPI	Laser Peripheral Iridotomy	Glaucoma treatment procedure.	LPI performed in acute angle closure.
L167	LPK	Leukocyte Peroxidase	Enzyme in WBCs.	LPK measured in infections.
L168	LPL	Lipoprotein Lipase	Enzyme breaking down triglycerides.	LPL deficiency causes hyperlipidemia.
L169	LPM	Left Psoas Muscle	Anatomical structure.	LPM abscess seen on CT.
L170	LPN	Licensed Practical Nurse	Mid-level healthcare professional.	LPN assists in hospital care.
L171	LPO	Left Posterior Oblique (position)	Radiographic body positioning.	LPO X-ray used in chest imaging.
L172	LPP	Lichen Planus Pigmentosus	Dermatologic disease.	LPP causes hyperpigmented patches.
L173	LPR	Laryngopharyngeal Reflux	Acid reflux reaching larynx.	LPR causes chronic cough.
L174	LPSN	Lymph Node Positive for Sentinel	Pathology finding.	LPSN guides breast cancer surgery.
L175	LPT	Liver Preservation Technique	Method in transplant surgery.	LPT prolongs graft survival.
L176	LPV	Lopinavir	Antiretroviral drug.	LPV used in HIV therapy.
L177	LQTS	Long QT Syndrome	Arrhythmia predisposition.	LQTS treated with beta-blockers.
L178	LRAI	Left Renal Artery Infarction	Blockage of left renal artery.	LRAI causes flank pain.
L179	LRB	Left Retinal Branch	Blood vessel in retina.	LRB occlusion causes vision loss.
L180	LRD	Living Related Donor	Kidney/liver donor type.	LRD transplant common in Asia.
L181	LRF	Luteinizing Hormone Releasing Factor	Alternative for GnRH.	LRF analogs used in IVF.
L182	LRG	Leucine-Rich Glycoprotein	Plasma protein marker.	LRG elevated in IBD.
L183	LRM	Left Rectus Muscle	Eye muscle.	LRM palsy causes diplopia.
L184	LRN	Lateral Reticular Nucleus	Brainstem nucleus.	LRN involved in motor control.
L185	LRO	Laparoscopic Radical Oophorectomy	Surgical ovarian removal.	LRO done for ovarian cancer.
L186	LRP	Low-Risk Prostate cancer	Cancer risk classification.	LRP managed with active surveillance.
L187	LRR	Locoregional Recurrence	Cancer returning in same region.	LRR after mastectomy treated with radiation.
L188	LRS	Laryngopharyngeal Reflux Syndrome	Upper airway reflux disorder.	LRS treated with PPIs.
L189	LRT	Lower Respiratory Tract	Includes trachea, bronchi, lungs.	LRT infections include pneumonia.
L190	LRV	Left Renal Vein	Drains blood from left kidney.	LRV entrapment causes nutcracker syndrome.
L191	LS	Lichen Sclerosus	Chronic skin condition.	LS affects genital skin.
L192	LSAH	Left Subarachnoid Hemorrhage	Bleeding under arachnoid membrane.	LSAH diagnosed on CT scan.
L193	LSC	Laparoscopic Cholecystectomy	Gallbladder removal surgery.	LSC common for gallstones.
L194	LSG	Laparoscopic Sleeve Gastrectomy	Bariatric surgery.	LSG reduces stomach size.
L195	LSI	Lumbar Spine Injury	Trauma to lumbar region.	LSI causes back pain.
L196	LSMF	Lateral Suboccipital Myofascial	Muscle group in neck.	LSMF strain causes headaches.
L197	LSN	Left Sural Nerve	Nerve in lower limb.	LSN biopsy for neuropathy.
L198	LSPT	Left Sided Pleural Tap	Thoracentesis procedure.	LSPT performed for pleural effusion.
L199	LSR	Laser Speckle Rheology	Technique to measure blood flow.	LSR applied in microcirculation studies.
L200	LST	Laterally Spreading Tumor	Flat colorectal neoplasm.	LST removed via endoscopic resection.