Internal Medicine Acronyms

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Internal Medicine Alphabet – H

S. No	Acronyms	Full Form	Short Explanation	Practical Example
H001	H&P	History and Physical	Standard patient assessment form.	Admission requires H&P documentation.
H002	HACE	High-Altitude Cerebral Edema	Life-threatening brain swelling at high altitude.	Mountaineer evacuated due to HACE.
H003	HACCP	Hazard Analysis and Critical Control Point	Risk management system in healthcare food safety.	HACCP protocols applied in hospital kitchens.
H004	HAI	Hospital-Acquired Infection	Infections contracted during hospital stay.	MRSA bacteremia is a common HAI.
H005	HALS	Hand-Assisted Laparoscopic Surgery	Hybrid minimally invasive surgical technique.	HALS performed for colectomy.
H006	HAM	HTLV-1–Associated Myelopathy	Chronic neurological disease from HTLV-1.	HAM diagnosed with spastic paraparesis.
H007	HAP	Hospital-Acquired Pneumonia	Pneumonia developing ≥48 hours after admission.	Ventilated patient developed HAP.
H008	HAV	Hepatitis A Virus	Virus causing acute hepatitis.	Traveler vaccinated against HAV.
H009	Hb	Hemoglobin	Protein carrying oxygen in blood.	Hb 10 g/dL in anemic patient.
H010	HbA1c	Glycated Hemoglobin	Marker of long-term glycemic control.	HbA1c 8.2% indicated poor diabetes control.
H011	HBC	Hepatitis B Core	Component of HBV serology.	Anti-HBc positive suggests exposure.
H012	HBeAg	Hepatitis B e Antigen	Marker of viral replication.	HBeAg positivity indicates high infectivity.
H013	HBF	High-Body Fat	Excess adiposity impacting health.	HBF linked to metabolic syndrome.
H014	HBG	Hemoglobin Gene	Gene encoding hemoglobin protein chains.	HBG mutations cause thalassemia.
H015	HBsAg	Hepatitis B Surface Antigen	Marker of active HBV infection.	Positive HBsAg confirmed chronic hepatitis B.
H016	HBV	Hepatitis B Virus	DNA virus infecting the liver.	HBV screening before chemotherapy.
H017	HCC	Hepatocellular Carcinoma	Primary liver cancer.	Cirrhosis patient developed HCC.
H018	HCG	Human Chorionic Gonadotropin	Hormone produced in pregnancy.	HCG test confirmed pregnancy.
H019	HCL	Hairy Cell Leukemia	Rare slow-growing B-cell leukemia.	HCL diagnosed via bone marrow biopsy.
H020	HCM	Hypertrophic Cardiomyopathy	Genetic heart condition with thickened ventricles.	HCM caused sudden collapse in athlete.
H021	HCP	Healthcare Provider	Licensed professional delivering medical care.	Vaccinations administered by HCP.
H022	HCT	Hematocrit	Proportion of red blood cells in blood.	HCT decreased in anemia.
H023	HD	Hemodialysis	Procedure filtering blood in renal failure.	ESRD patient receives HD thrice weekly.
H024	HDL	High-Density Lipoprotein	“Good” cholesterol protecting heart.	HDL 60 mg/dL is protective.
H025	HDU	High Dependency Unit	Ward for patients needing closer monitoring.	Post-op patient admitted to HDU.
H026	HE	Hepatic Encephalopathy	Brain dysfunction due to liver failure.	Lactulose used to treat HE.
H027	HEENT	Head, Eyes, Ears, Nose, Throat	Standard exam format.	HEENT exam showed pharyngitis.
H028	HELLP	Hemolysis, Elevated Liver enzymes, Low Platelets	Severe pregnancy complication.	HELLP syndrome required urgent delivery.
H029	HEP	Hepatitis	Inflammation of the liver.	Viral HEP diagnosed by serology.
H030	HF	Heart Failure	Condition where heart cannot pump adequately.	HF treated with diuretics and ACE inhibitors.
H031	HFA	Hydrofluoroalkane	Inhaler propellant.	Asthma patient prescribed HFA inhaler.
H032	HFpEF	Heart Failure with Preserved Ejection Fraction	Type of diastolic heart failure.	Elderly hypertensive woman had HFpEF.
H033	HFrEF	Heart Failure with Reduced Ejection Fraction	Systolic dysfunction of the heart.	Beta-blockers used for HFrEF.
H034	HG	Hemoglobin	Oxygen-binding protein in RBCs.	Low HG indicates anemia.
H035	HHS	Hyperosmolar Hyperglycemic State	Severe diabetes emergency without ketoacidosis.	Elderly diabetic admitted with HHS.
H036	HIV	Human Immunodeficiency Virus	Virus causing AIDS.	HIV diagnosed with ELISA and confirmed by Western blot.
H037	HLA	Human Leukocyte Antigen	Genetic markers for immune response.	HLA typing before transplantation.
H038	HLD	Hyperlipidemia	High blood lipid levels.	Statins prescribed for HLD.
H039	HLE	Hemolytic Episode	Period of RBC destruction.	G6PD deficiency triggered HLE.
H040	HLV	Human Lymphotropic Virus	Family of retroviruses.	HTLV-1 is a pathogenic HLV.
H041	HM	Hospital Medicine	Specialty focusing on inpatient care.	HM team managed complex case.
H042	HME	Heat and Moisture Exchanger	Device in mechanical ventilation.	HME used to humidify inspired gases.
H043	HMG	Hydroxymethylglutaryl	Prefix in cholesterol metabolism.	HMG-CoA reductase targeted by statins.
H044	HN	Head and Neck	Medical term for this anatomical region.	HN exam revealed lymphadenopathy.
H045	HNPCC	Hereditary Nonpolyposis Colorectal Cancer	Genetic cancer syndrome (Lynch).	Colonoscopy surveillance for HNPCC.
H046	HNPP	Hereditary Neuropathy with Pressure Palsies	Genetic neuropathy disorder.	HNPP diagnosed by nerve conduction study.
H047	HOCM	Hypertrophic Obstructive Cardiomyopathy	Form of HCM with outflow obstruction.	Beta-blockers given for HOCM.
H048	HOS	Home Oxygen Service	Provision of oxygen for chronic illness.	COPD patient enrolled in HOS.
H049	HPV	Human Papillomavirus	Virus linked to cervical and throat cancers.	HPV vaccine given to adolescents.
H050	HR	Heart Rate	Number of beats per minute.	HR 120 bpm in tachycardia.
H051	HRCT	High-Resolution CT	Imaging technique for lung disease.	HRCT revealed pulmonary fibrosis.
H052	HRT	Hormone Replacement Therapy	Estrogen/progestin therapy in menopause.	HRT used to manage hot flashes.
H053	HS	Heart Sounds	Noises from heart valves on auscultation.	HS S3 present in heart failure.
H054	HSC	Hematopoietic Stem Cell	Precursor of blood cells.	HSC transplant performed for leukemia.
H055	HSP	Henoch-Schönlein Purpura	Small-vessel vasculitis with IgA deposits.	Child with rash and hematuria had HSP.
H056	HT	Hypertension	Chronic high blood pressure.	ACE inhibitors prescribed for HT.
H057	HTLV	Human T-Cell Leukemia Virus	Retrovirus causing leukemia/neuropathy.	HTLV-1 linked to adult T-cell leukemia.
H058	HTN	Hypertension	Abnormally high blood pressure.	HTN controlled with lifestyle and meds.
H059	HTO	High Tibial Osteotomy	Orthopedic surgery for knee arthritis.	HTO performed for medial OA.
H060	HTR	Hemolytic Transfusion Reaction	Immune destruction of transfused RBCs.	Fever and hemoglobinuria indicated HTR.
H061	HUA	Hyperuricemia	High uric acid in blood.	HUA leads to gout attacks.
H062	HUS	Hemolytic Uremic Syndrome	Triad of anemia, thrombocytopenia, renal failure.	Child developed HUS after E. coli infection.
H063	HVA	Homovanillic Acid	Dopamine metabolite measured in urine.	Elevated HVA in neuroblastoma.
H064	HVD	Heart Valve Disease	Pathology of cardiac valves.	HVD includes stenosis and regurgitation.
H065	HVS	Hyperventilation Syndrome	Anxiety-induced overbreathing.	Patient with panic attack developed HVS.
H066	HW	Heart Weight	Measure in pathology of cardiac hypertrophy.	HW increased in longstanding HTN.
H067	Hx	History	Patient’s medical story.	Hx revealed prior MI.
H068	HZV	Herpes Zoster Virus	Virus causing shingles.	Antivirals prescribed for HZV reactivation.
H069	HbE	Hemoglobin E	Variant hemoglobin found in SE Asia.	HbE trait detected on electrophoresis.
H070	HbF	Fetal Hemoglobin	Oxygen carrier in fetus.	HbF persists in thalassemia.
H071	HbH	Hemoglobin H	Variant seen in alpha-thalassemia.	HbH disease causes hemolysis.
H072	HbS	Hemoglobin S	Abnormal hemoglobin in sickle cell.	HbS confirmed sickle cell disease.
H073	HbSS	Homozygous Sickle Cell	Severe form of sickle cell disease.	HbSS patient required transfusions.
H074	HBM	Human Breast Milk	Nutrient-rich milk for infants.	HBM fed in neonatal ICU.
H075	HBMV	Human Beta-Microglobulin Virus	Proposed virus, studied in oncology.	Research explored HBMV association.
H076	HBP	High Blood Pressure	Another term for hypertension.	HBP controlled with ARBs.
H077	HBr	Hydrobromide	Salt form of medications.	Dextromethorphan HBr prescribed.
H078	HCO3	Bicarbonate	Key buffer in acid-base balance.	HCO3 low in metabolic acidosis.
H079	HCCS	Hepatocellular Carcinoma Screening	Surveillance in cirrhotics.	HCCS with ultrasound every 6 months.
H080	HCMV	Human Cytomegalovirus	Virus of herpes family.	HCMV infection in transplant patient.
H081	HCS	Health Care System	Organization of health services.	Universal HCS improves outcomes.
H082	HCTZ	Hydrochlorothiazide	Thiazide diuretic for hypertension.	HCTZ 25 mg prescribed.
H083	HDM	House Dust Mite	Common allergen.	HDM allergy causes rhinitis.
H084	HDO	Hospital Day of Operation	Refers to surgery day.	HDO documented in operative notes.
H085	HDV	Hepatitis D Virus	Requires HBV for replication.	HDV co-infection worsens HBV prognosis.
H086	HE4	Human Epididymis Protein 4	Tumor marker for ovarian cancer.	HE4 elevated in malignancy.
H087	HEF	Heart Ejection Fraction	Proportion of blood pumped by heart.	HEF <40% indicates HFrEF.
H088	HEPA	High-Efficiency Particulate Air	Specialized filter for airborne pathogens.	HEPA filters in ICU rooms.
H089	HEV	Hepatitis E Virus	RNA virus transmitted via fecal-oral route.	HEV infection after contaminated water.
H090	HFNC	High-Flow Nasal Cannula	Oxygen delivery device.	COVID-19 patient managed with HFNC.
H091	HGA	Human Granulocytic Anaplasmosis	Tick-borne bacterial infection.	HGA treated with doxycycline.
H092	HGF	Hepatocyte Growth Factor	Protein promoting liver regeneration.	HGF studied in cirrhosis therapy.
H093	HGN	Horizontal Gaze Nystagmus	Involuntary eye movement test.	HGN observed in intoxicated driver.
H094	HGP	Human Genome Project	Global initiative to map human DNA.	HGP identified multiple disease genes.
H095	HGS	Hand Grip Strength	Functional test of muscle.	Low HGS in sarcopenia.
H096	HGV	Hepatitis G Virus	Flavivirus associated with chronic infection.	HGV detected by PCR.
H097	HH	Hiatus Hernia	Stomach herniation into thorax.	GERD worsened by HH.
H098	HHD	Hypertensive Heart Disease	Heart complications due to HTN.	LVH on echo suggests HHD.
H099	HHS	Health and Human Services	US federal health department.	CDC operates under HHS.
H100	HHV	Human Herpes Virus	Family of DNA viruses.	HHV-6 causes roseola in children.

S. No	Acronyms	Full Form	Short Explanation	Practical Example
H101	HI	Head Injury	Trauma to the skull/brain.	Patient with HI monitored for ICP rise.
H102	HIB	Haemophilus Influenzae Type B	Bacterium causing meningitis, pneumonia.	HIB vaccine given to infants.
H103	HIDA	Hepatobiliary Iminodiacetic Acid	Nuclear scan for gallbladder function.	HIDA scan confirmed acute cholecystitis.
H104	HIE	Hypoxic-Ischemic Encephalopathy	Brain injury due to lack of oxygen.	Neonate developed HIE after prolonged labor.
H105	HIF	Hypoxia-Inducible Factor	Protein regulating response to low oxygen.	HIF pathway studied in cancer.
H106	HINTS	Head-Impulse, Nystagmus, Test of Skew	Bedside test to differentiate central vs peripheral vertigo.	HINTS exam suggested stroke.
H107	HIR	Hepatic Insulin Resistance	Reduced liver response to insulin.	HIR contributes to T2DM.
H108	HIS	Health Information System	System for managing healthcare data.	HIS integrated with electronic records.
H109	HIT	Heparin-Induced Thrombocytopenia	Immune-mediated drop in platelets after heparin.	HIT antibody test ordered.
H110	HIVAN	HIV-Associated Nephropathy	Kidney disease due to HIV infection.	HIVAN diagnosed with proteinuria.
H111	HJR	Hepatojugular Reflux	Clinical sign of right heart failure.	Positive HJR seen in CHF patient.
H112	HL	Hodgkin Lymphoma	Type of lymphoid malignancy.	HL treated with ABVD chemotherapy.
H113	HLA-B27	Human Leukocyte Antigen B27	Genetic marker linked to autoimmune disease.	HLA-B27 positive in ankylosing spondylitis.
H114	HLDL	High Low-Density Lipoprotein	“Bad” cholesterol subtype.	HLDL raised in dyslipidemia.
H115	HLE	Hypereosinophilic Leukemia	Leukemia with persistent eosinophilia.	HLE treated with imatinib.
H116	HLM	Hospital Length of Stay	Number of days admitted in hospital.	HLM reduced with enhanced recovery.
H117	HLP	Hyperlipoproteinemia	Elevated blood lipoproteins.	HLP classified by Fredrickson types.
H118	HLR	High Lateral Release	Orthopedic surgical technique.	HLR performed in patellar instability.
H119	HLS	Health Literacy Score	Measure of patient’s understanding of health.	HLS improved after counseling.
H120	HLX	Helicase	Enzyme unwinding DNA strands.	HLX studied in DNA repair.
H121	HMGB1	High-Mobility Group Box 1	Inflammatory mediator in sepsis.	HMGB1 targeted in experimental therapy.
H122	HMEV	Human Metapneumovirus	Virus causing respiratory infections.	HMEV infection in immunocompromised patient.
H123	HMG-CoA	Hydroxymethylglutaryl-Coenzyme A	Precursor in cholesterol synthesis.	HMG-CoA reductase inhibited by statins.
H124	HMIS	Health Management Information System	Digital system for patient data.	HMIS deployed in public health.
H125	HMP	Hospital Medicine Program	Program for inpatient care.	HMP staffed by hospitalists.
H126	HMPV	Human Metapneumovirus	Virus causing bronchiolitis/pneumonia.	HMPV outbreak in pediatrics ward.
H127	HNCC	Head and Neck Cancer Center	Specialized cancer care facility.	Patient referred to HNCC.
H128	HNP	Herniated Nucleus Pulposus	Disc herniation in spine.	HNP causing sciatica.
H129	HNS	Head and Neck Surgery	Surgical specialty.	HNS consult for laryngeal cancer.
H130	HNT	Hypertension	Another common abbreviation for high BP.	HNT noted in patient history.
H131	HOC	Home Oxygen Concentrator	Device delivering oxygen at home.	COPD patient using HOC.
H132	HOMA	Homeostatic Model Assessment	Measure of insulin resistance.	HOMA-IR calculated in diabetes research.
H133	HOMG	Human Oligodendrocyte Myelin Glycoprotein	Protein in CNS myelin.	HOMG studied in MS.
H134	HOP	History of Present Illness	Patient’s symptom story.	HOP documented on admission note.
H135	HOPC	History of Present Complaint	Alternative phrasing for HPI.	HOPC noted during evaluation.
H136	HOPS	History, Observation, Palpation, Special tests	Sports medicine assessment.	HOPS used in ankle sprain evaluation.
H137	HOT	Home Oxygen Therapy	Long-term oxygen for chronic lung disease.	HOT prescribed for severe COPD.
H138	HP	Histopathology	Microscopic study of tissues.	HP confirmed adenocarcinoma.
H139	HPA	Hypothalamic-Pituitary-Adrenal Axis	Neuroendocrine stress system.	HPA dysfunction seen in Addison’s.
H140	HPAI	Highly Pathogenic Avian Influenza	Severe bird flu strain transmissible to humans.	HPAI outbreak caused pneumonia cluster.
H141	HPE	Hypoxic Pulmonary Edema	Lung swelling due to hypoxia.	HPE seen in high-altitude climbers.
H142	HPF	High Power Field	Unit of magnification under microscope.	10 WBCs/HPF in urine sample.
H143	HPH	Hypophosphatemia	Low phosphate in blood.	HPH in refeeding syndrome.
H144	HPI	History of Present Illness	Structured description of symptoms.	HPI included chest pain duration.
H145	HPL	Human Placental Lactogen	Placental hormone in pregnancy.	HPL monitored in gestational diabetes.
H146	HPO	Hypothalamic-Pituitary-Ovarian Axis	Hormonal control of female reproduction.	HPO axis disrupted in PCOS.
H147	HPP	Hypokalemic Periodic Paralysis	Episodic muscle weakness due to low K+.	HPP triggered by exercise.
H148	HPS	Hepatopulmonary Syndrome	Pulmonary vascular complication of cirrhosis.	Dyspnea in cirrhotics due to HPS.
H149	HPV-DNA	Human Papillomavirus DNA	Molecular test for HPV infection.	HPV-DNA detected in Pap smear sample.
H150	HRH	Histamine Receptor H	Subtypes of histamine receptors.	HRH antagonists used in allergy.
H151	HRM	High-Resolution Manometry	Test for esophageal motility disorders.	HRM performed for achalasia.
H152	HRQoL	Health-Related Quality of Life	Measure of well-being with disease.	HRQoL assessed in cancer patients.
H153	HRTN	Hypertension	Alternative abbreviation.	HRTN noted in chart.
H154	HRV	Heart Rate Variability	Measure of autonomic control of HR.	HRV decreased in diabetic neuropathy.
H155	HSAN	Hereditary Sensory and Autonomic Neuropathy	Genetic disorder affecting nerves.	HSAN diagnosed in child with absent pain sensation.
H156	HSCN	Health and Social Care Network	UK healthcare digital system.	Hospital connected via HSCN.
H157	HSE	Health and Safety Executive	UK regulator of workplace safety.	HSE guidelines followed in labs.
H158	HSG	Hysterosalpingography	Imaging of uterus and fallopian tubes.	HSG ordered in infertility workup.
H159	HSI	Hepatic Steatosis Index	Non-invasive score for fatty liver.	HSI >36 suggests NAFLD.
H160	HSPC	Hematopoietic Stem/Progenitor Cell	Cells used in transplant.	HSPC mobilized with G-CSF.
H161	HST	Home Sleep Test	Test for sleep apnea at home.	HST performed for suspected OSA.
H162	HSV	Herpes Simplex Virus	Virus causing oral/genital lesions.	HSV-2 detected in PCR test.
H163	HTK	Histidine-Tryptophan-Ketoglutarate	Cardioplegia solution in surgery.	HTK used in organ preservation.
H164	HTS	Hypertonic Saline	Used in severe hyponatremia/ICP control.	HTS infusion given for cerebral edema.
H165	HTX	Heart Transplant	Surgical replacement of diseased heart.	HTX performed for end-stage cardiomyopathy.
H166	HUAO	Hepatic Artery Occlusion	Blockage of hepatic artery.	HUAO seen post-transplant.
H167	HUSK	Hypothermia, Unresponsiveness, Shock, Koma	Mnemonic for hypothermia.	HUSK used in ER to assess frozen patient.
H168	HUT	Head-Up Tilt	Tilt test for syncope evaluation.	HUT positive in vasovagal syncope.
H169	HV	Hepatic Vein	Vessel draining blood from liver.	HV thrombosis causes Budd-Chiari.
H170	HVF	Humphrey Visual Field	Ophthalmic test for vision loss.	HVF done in glaucoma follow-up.
H171	HVG	High Voltage Gradient	Used in electrophysiology.	HVG noted in ECG analysis.
H172	HVR	Hypoxic Ventilatory Response	Respiratory adaptation to low oxygen.	HVR blunted in COPD.
H173	HWB	Health and Wellbeing Board	Local health authority group.	HWB implemented obesity programs.
H174	HWK	Health Workforce Knowledge	Data on healthcare staffing.	HWK reports used in planning.
H175	HX	Hemothorax	Blood in pleural cavity.	Trauma patient had HX on CXR.
H176	HXT	Hematocrit Test	Blood test for RBC concentration.	HXT ordered in anemia workup.
H177	HY	Hydroxyurea	Chemotherapy for sickle cell and CML.	HY prescribed to reduce sickle crises.
H178	HYD	Hydrocortisone	Steroid hormone used in adrenal insufficiency.	IV HYD given for Addisonian crisis.
H179	HYG	Hygiene	Practices to maintain health.	Hand HYG prevents infections.
H180	HZ	Herpes Zoster	Shingles due to VZV reactivation.	HZ treated with acyclovir.
H181	HZA	Herpes Zoster Antibody	Serology for prior exposure.	HZA positive indicates immunity.
H182	HZIG	Herpes Zoster Immunoglobulin	Passive immunity against VZV.	HZIG given to immunocompromised.
H183	Hz	Hertz	Frequency measurement.	EEG waveforms measured in Hz.
H184	HAA	Hepatic Artery Aneurysm	Rare vascular condition.	CT angiography revealed HAA.
H185	HAPO	Hyperglycemia and Adverse Pregnancy Outcome	International study/criteria.	HAPO criteria used in GDM diagnosis.
H186	HAT	Heparin-Associated Thrombocytopenia	Non-immune platelet drop from heparin.	HAT milder than HIT.
H187	HBA	Hemoglobin A	Normal adult hemoglobin type.	HBA predominant in electrophoresis.
H188	HBOT	Hyperbaric Oxygen Therapy	High-pressure O₂ treatment.	HBOT used in carbon monoxide poisoning.
H189	HBPV	Hepatic Blood Portal Vein	Main vessel carrying blood to liver.	HBPV thrombosis managed with anticoagulants.
H190	HCAHPS	Hospital Consumer Assessment of Healthcare Providers and Systems	Survey for patient satisfaction.	HCAHPS results published annually.
H191	HCPCS	Healthcare Common Procedure Coding System	Billing codes in US healthcare.	Medicare claims filed with HCPCS.
H192	HCCL	Human Choriocarcinoma Cell Line	Lab model for cancer research.	HCCL used in chemotherapy testing.
H193	HDC	High Dose Chemotherapy	Intensive cancer treatment.	HDC followed by stem cell rescue.
H194	HDP	Hypertensive Disorders of Pregnancy	HTN-related complications in pregnancy.	HDP includes preeclampsia.
H195	HE4	Human Epididymis Protein 4	Ovarian cancer biomarker.	HE4 elevated in malignancy.
H196	HEENT-ROS	Head, Eyes, Ears, Nose, Throat – Review of Systems	Structured system review.	HEENT-ROS documented in clinic note.
H197	HEPAFLO	High-Efficiency Particulate Air Flow	Hospital air cleaning system.	HEPAFLO used in ICU.
H198	HHC	Home Health Care	Medical services provided at home.	Post-op patient enrolled in HHC.
H199	HNDS	Head and Neck Diagnostic Services	Subspecialty testing service.	HNDS provided laryngoscopy.
H200	HZV	Herpes Zoster Virus	Another term for VZV.	HZV reactivation caused shingles.