Internal Medicine Abbreviations

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Internal Medicine Alphabet – H

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
H001	HA	Headache	Common neurological symptom with multiple causes.	Patient presents with migraine-type HA.
H002	HAAF	Hypoglycemia-Associated Autonomic Failure	Blunting of hypoglycemia warning signs in diabetics.	Recurrent low sugar in type 1 diabetes without symptoms.
H003	HAV	Hepatitis A Virus	Acute viral hepatitis spread fecal-orally.	Diagnosed in a foodborne hepatitis outbreak.
H004	Hb	Hemoglobin	Oxygen-carrying protein in red blood cells.	Hb measured in anemia work-up.
H005	HbA1c	Hemoglobin A1c	Reflects average blood sugar over 3 months.	HbA1c of 8% indicates poor diabetes control.
H006	HBAO	Hemoglobin A Osaka	Rare abnormal hemoglobin variant.	Identified in thalassemia screening.
H007	HBeAg	Hepatitis B e Antigen	Marker of HBV replication and infectivity.	Positive in active HBV carriers.
H008	HBsAg	Hepatitis B Surface Antigen	First marker of HBV infection.	Used in blood donor screening.
H009	HBV	Hepatitis B Virus	Major cause of chronic liver disease.	Prevented with HBV vaccination.
H010	HCC	Hepatocellular Carcinoma	Primary liver cancer, often HBV/HCV related.	Elevated AFP in HCC.
H011	HCG	Human Chorionic Gonadotropin	Hormone in pregnancy and tumor marker.	High in choriocarcinoma.
H012	HCM	Hypertrophic Cardiomyopathy	Genetic thickening of the heart muscle.	Risk of sudden cardiac death in athletes.
H013	HCO3	Bicarbonate	Blood buffer regulating acid-base balance.	Assessed in metabolic acidosis.
H014	HCP	Hereditary Coproporphyria	Rare porphyria with abdominal and neuro symptoms.	Triggered by certain drugs.
H015	HCT	Hematocrit	Proportion of blood made up of RBCs.	Low in iron deficiency anemia.
H016	HDL	High-Density Lipoprotein	“Good cholesterol” protective against CAD.	Increased with regular exercise.
H017	HDV	Hepatitis D Virus	RNA virus dependent on HBV.	Co-infection worsens prognosis.
H018	HE	Hepatic Encephalopathy	Neuro dysfunction due to liver failure.	Asterixis in cirrhosis patient.
H019	HEENT	Head, Eyes, Ears, Nose, Throat	Standard physical exam section.	Documented as “HEENT normal.”
H020	HELLP	Hemolysis, Elevated Liver enzymes, Low Platelets	Severe pre-eclampsia complication.	Emergency C-section often needed.
H021	HEPA	High-Efficiency Particulate Air	Filter removing fine airborne particles.	Used in isolation wards.
H022	HES	Hypereosinophilic Syndrome	Persistent eosinophilia causing organ damage.	Cardiac involvement is common.
H023	HFE	Hemochromatosis Gene	Mutation causing iron overload.	Genetic testing for hemochromatosis.
H024	HFpEF	Heart Failure with Preserved Ejection Fraction	Diastolic dysfunction with normal EF.	Common in elderly with HTN.
H025	HFrEF	Heart Failure with Reduced Ejection Fraction	Systolic heart failure.	Treated with ACE inhibitors and beta-blockers.
H026	HGPRT	Hypoxanthine-Guanine Phosphoribosyltransferase	Deficiency causes Lesch-Nyhan syndrome.	Leads to self-mutilation behaviors.
H027	HHT	Hereditary Hemorrhagic Telangiectasia	Disorder with fragile vessels, recurrent bleeds.	Frequent epistaxis in patients.
H028	HHV	Human Herpes Virus	Virus family causing latent infections.	Includes HSV, CMV, VZV.
H029	HHS	Hyperosmolar Hyperglycemic State	Severe hyperglycemia complication of type 2 DM.	Blood glucose > 600 mg/dl.
H030	HIV	Human Immunodeficiency Virus	Retrovirus causing AIDS.	Managed with HAART.
H031	HJR	Hepatojugular Reflux	Rise in JVP with abdominal pressure.	Seen in right-sided HF.
H032	HLA	Human Leukocyte Antigen	Genes important in immune response.	Used in organ transplant matching.
H033	HLD	Hyperlipidemia	Elevated lipid levels.	Managed with statins.
H034	HLH	Hemophagocytic Lymphohistiocytosis	Life-threatening immune activation syndrome.	High ferritin levels in HLH.
H035	HLP	Hyperlipoproteinemia	Elevated lipoproteins in blood.	Familial HLP causes xanthomas.
H036	HME	Hemimegalencephaly	Congenital brain malformation.	Causes refractory epilepsy.
H037	HMG-CoA	Hydroxymethylglutaryl-Coenzyme A	Enzyme in cholesterol synthesis pathway.	Target of statins.
H038	HMPA	Hexamethylphosphoramide	Chemical exposure linked with toxicity.	Rarely relevant clinically.
H039	HN	Hyponatremia	Low sodium concentration in blood.	Causes confusion, seizures.
H040	HNPCC	Hereditary Non-Polyposis Colorectal Cancer	Genetic predisposition to colon cancer.	Also called Lynch syndrome.
H041	HOCM	Hypertrophic Obstructive Cardiomyopathy	Subtype with LV outflow obstruction.	Harsh systolic murmur increases with Valsalva.
H042	HPA	Hypothalamic-Pituitary-Adrenal	Major endocrine axis regulating stress.	Tested with ACTH stimulation.
H043	HPAI	Highly Pathogenic Avian Influenza	Severe influenza strain.	Causes ARDS in humans.
H044	HPF	High Power Field	Microscope view magnification.	WBCs counted per HPF in urine.
H045	HPI	History of Present Illness	Key part of medical history.	“HPI: chest pain for 2 hours.”
H046	HPL	Hereditary Persistence of Hemoglobin F	Condition with continued HbF in adults.	Usually benign.
H047	HPS	Hepatopulmonary Syndrome	Hypoxemia due to liver disease.	Orthodeoxia is a classic feature.
H048	HPV	Human Papilloma Virus	Virus causing warts, cervical cancer.	Prevented by HPV vaccine.
H049	HR	Heart Rate	Number of heartbeats per minute.	Normal HR = 60–100 bpm.
H050	HRCT	High-Resolution Computed Tomography	Imaging technique for lungs.	Used in interstitial lung disease.
H051	HRQoL	Health-Related Quality of Life	Patient-reported measure of health.	Used in clinical trials.
H052	HRT	Hormone Replacement Therapy	Hormonal treatment in menopause.	Improves hot flashes.
H053	HSP	Henoch–Schönlein Purpura	Vasculitis affecting skin, gut, kidneys.	Palpable purpura on legs.
H054	HSR	Hypersensitivity Reaction	Immune-mediated adverse reaction.	Type I-IV reactions classification.
H055	HT	Hypertension	High blood pressure, common risk factor.	BP > 140/90 mmHg.
H056	HTLV	Human T-Lymphotropic Virus	Retrovirus causing leukemia.	HTLV-1 linked with T-cell leukemia.
H057	HTN	Hypertension	Abbreviated form widely used.	Patient on antihypertensives for HTN.
H058	HUS	Hemolytic Uremic Syndrome	Triad of hemolysis, renal failure, thrombocytopenia.	Often post E. coli infection.
H059	HUT	Hematopoietic Stem Cell Transplant	Bone marrow transplantation.	Used in leukemia treatment.
H060	HV	Hepatic Vein	Carries blood from liver to IVC.	Blockage causes Budd-Chiari syndrome.
H061	HVA	Homovanillic Acid	Dopamine metabolite measured in urine.	Elevated in neuroblastoma.
H062	HVD	Heart Valve Disease	Disorder of cardiac valves.	MR, AS are common forms.
H063	HVR	Hepatic Venous Resistance	Pressure across hepatic veins.	Elevated in cirrhosis.
H064	HVS	High Vaginal Swab	Microbiological test in gynecology.	Taken in suspected vaginitis.
H065	HW	Heartworm	Parasitic worm affecting pets, rare in humans.	Seen in tropical countries.
H066	HZ	Herpes Zoster	Reactivation of varicella virus.	Painful dermatomal rash.
H067	HZO	Herpes Zoster Ophthalmicus	Zoster involving trigeminal nerve eye branch.	Causes vision loss if untreated.
H068	H2	Histamine Type 2 Receptor	Gastric acid regulation receptor.	Blocked by ranitidine.
H069	H2RA	Histamine-2 Receptor Antagonist	Drugs reducing stomach acid.	Famotidine is an H2RA.
H070	H1N1	Hemagglutinin Type 1, Neuraminidase Type 1	Influenza subtype.	2009 swine flu pandemic.
H071	H1RA	Histamine-1 Receptor Antagonist	Antihistamines for allergies.	Loratadine is an H1RA.
H072	H2O	Water	Universal solvent essential for life.	IV fluids contain sterile H2O.
H073	H2O2	Hydrogen Peroxide	Antiseptic and oxidizing agent.	Used in wound cleaning.
H074	H3N2	Hemagglutinin 3, Neuraminidase 2	Influenza subtype.	Causes seasonal flu outbreaks.
H075	H5N1	Avian Influenza A Virus	Highly pathogenic flu strain.	Associated with bird flu.
H076	H7N9	Avian Influenza A Virus Subtype	Severe zoonotic influenza.	Human infections reported in Asia.
H077	H9N2	Low Pathogenic Avian Influenza Virus	Mild bird flu virus.	Rare human infection.
H078	HCMV	Human Cytomegalovirus	Herpesvirus causing disease in immunocompromised.	Causes CMV retinitis in AIDS.
H079	HMWK	High Molecular Weight Kininogen	Coagulation factor component.	Deficiency → bleeding disorders.
H080	HNP	Herniated Nucleus Pulposus	Spinal disc herniation.	Causes sciatica pain.
H081	HNP1	Human Neutrophil Peptide-1	Antimicrobial peptide.	Plays role in innate immunity.
H082	HOMA-IR	Homeostatic Model Assessment-Insulin Resistance	Index of insulin resistance.	Used in metabolic syndrome.
H083	HOPI	History of Present Illness	Detailed patient complaint narrative.	“HOPI: SOB for 3 days.”
H084	HPAI	Highly Pathogenic Avian Influenza	Severe strain of bird flu.	Linked to ARDS.
H085	HPgV	Human Pegivirus	Formerly GB virus C.	Nonpathogenic flavivirus.
H086	HPSA	Health Professional Shortage Area	Region lacking medical staff.	Used in public health planning.
H087	HPV DNA	Human Papillomavirus DNA Test	Molecular screening for HPV.	Used in cervical cancer screening.
H088	HRAS	Harvey Rat Sarcoma Viral Oncogene	Proto-oncogene involved in cancer.	Mutations linked to thyroid tumors.
H089	HRCTT	High-Resolution Chest CT	Advanced CT scan for lungs.	Detects interstitial fibrosis.
H090	HRC	Heart Rate Control	Clinical strategy in arrhythmias.	Target HR in AF management.
H091	HRmax	Maximum Heart Rate	Max HR during exercise.	HRmax ≈ 220 – age.
H092	HRTN	Hypertension (alt. abbr.)	Same as HTN.	Patient’s HRTN uncontrolled.
H093	HRV	Heart Rate Variability	Variation between heartbeats.	Low HRV → poor prognosis.
H094	HS	Heart Sounds	Noises from cardiac cycle.	S1, S2, murmurs.
H095	HSA	Hepatic Serum Albumin	Main liver protein.	Low in cirrhosis.
H096	HSAN	Hereditary Sensory Autonomic Neuropathy	Genetic disorder of peripheral nerves.	Leads to loss of pain sensation.
H097	HSC	Hematopoietic Stem Cell	Cells forming blood cells.	Source for stem cell transplant.
H098	HSG	Hysterosalpingography	Imaging of uterus and fallopian tubes.	Used in infertility work-up.
H099	HSI	Hepatic Steatosis Index	Non-invasive fatty liver score.	Calculated with labs and BMI.
H100	HSM	Hepatosplenomegaly	Enlargement of liver and spleen.	Seen in malaria and leukemia.
H101	HSP70	Heat Shock Protein 70	Cellular stress response protein.	Elevated in cell injury.
H102	HSP90	Heat Shock Protein 90	Molecular chaperone protein.	Target of cancer therapies.
H103	HSS	Hyperosmolar Saline Solution	High-concentration NaCl infusion.	Used in raised ICP.
H104	HTK	Histidine-Tryptophan-Ketoglutarate	Cardioplegia solution.	Used in cardiac surgery.
H105	HTT	Huntingtin Gene	Gene mutated in Huntington’s disease.	Genetic testing confirms diagnosis.
H106	HUSK	Hemolytic Uremic Syndrome–Kidney	Variant of HUS affecting kidneys.	Severe renal failure in children.
H107	HVA	Hydroxyvaleric Acid	Organic acid in urine.	Used in metabolic testing.
H108	HVS	High Vaginal Smear	Diagnostic smear in gynecology.	Done in suspected vaginitis.
H109	HWI	Hospital-Acquired Wound Infection	Infection after surgery.	Managed with antibiotics.
H110	HWS	Head Wobble Syndrome	Neurological disorder in animals.	Rare in humans.
H111	HZV	Herpes Zoster Virus	Same as VZV.	Reactivation causes shingles.
H112	Hcys	Homocysteine	Amino acid linked with CVD risk.	Elevated in folate deficiency.
H113	HbF	Hemoglobin Fetal	Fetal hemoglobin variant.	Elevated in thalassemia.
H114	HbS	Hemoglobin S	Abnormal Hb in sickle cell disease.	Causes vaso-occlusive crises.
H115	HbC	Hemoglobin C	Abnormal Hb causing mild hemolysis.	Seen in HbC disease.
H116	HbE	Hemoglobin E	Common variant in SE Asia.	Causes mild anemia.
H117	HbH	Hemoglobin H	Hb seen in α-thalassemia.	Causes hemolytic anemia.
H118	HbJ	Hemoglobin J	Rare abnormal variant.	Found on Hb electrophoresis.
H119	Hb Lepore	Hemoglobin Lepore	Fusion hemoglobin variant.	Causes thalassemia-like anemia.
H120	Hb Bart’s	Hemoglobin Bart’s	Gamma tetramer in severe α-thalassemia.	Causes hydrops fetalis.
H121	HbCO	Carboxyhemoglobin	Hb bound to CO.	Seen in carbon monoxide poisoning.
H122	Hb Met	Methemoglobin	Hb oxidized, unable to bind O2.	Seen in nitrate poisoning.
H123	Hb York	Hemoglobin York	Rare high-affinity Hb variant.	Causes polycythemia.
H124	Hb Chesapeake	Hemoglobin Chesapeake	Variant with high oxygen affinity.	Leads to secondary polycythemia.
H125	Hb Kansas	Hemoglobin Kansas	Low O2 affinity variant.	Causes cyanosis.
H126	Hb Köln	Hemoglobin Köln	Unstable Hb variant.	Leads to Heinz bodies.
H127	Hb M	Hemoglobin M	Causes congenital methemoglobinemia.	Cyanosis from birth.
H128	Hb Twin Peaks	Hemoglobin Twin Peaks	Rare variant Hb.	Found in hemoglobinopathy work-up.
H129	Hb Constant Spring	Hemoglobin Constant Spring	α-thalassemia variant.	Mild to moderate anemia.
H130	Hb Chesapeake Bay	Hemoglobin Chesapeake Bay	Hb variant with increased O2 affinity.	Mild erythrocytosis.
H131	Hb D	Hemoglobin D	Abnormal Hb variant.	Mild anemia in homozygotes.
H132	Hb O-Arab	Hemoglobin O-Arab	Hb variant seen in Arabs.	Causes mild anemia.
H133	Hb Yakima	Hemoglobin Yakima	High-affinity Hb variant.	Causes polycythemia.
H134	Hb Gun Hill	Hemoglobin Gun Hill	Deletion variant of Hb.	Seen in Africa.
H135	Hb Torino	Hemoglobin Torino	Rare unstable variant.	Causes hemolysis.
H136	Hb Samar	Hemoglobin Samar	Rare unstable Hb.	Found in Middle East.
H137	Hb Hope	Hemoglobin Hope	Rare β-chain variant.	Mild anemia.
H138	Hb J-Baltimore	Hemoglobin J Baltimore	Abnormal Hb variant.	Benign finding.
H139	Hb New York	Hemoglobin New York	Hb variant with altered oxygen affinity.	Detected in electrophoresis.
H140	Hb Milano	Hemoglobin Milano	Rare Hb variant.	Asymptomatic carriers.
H141	HbC Harlem	Hemoglobin C Harlem	Hybrid Hb variant.	Found in Africans.
H142	Hb Peter	Hemoglobin Peter	Abnormal Hb variant.	Mild anemia.
H143	Hb Kenya	Hemoglobin Kenya	Rare Hb variant.	Found in Africans.
H144	Hb Mizushima	Hemoglobin Mizushima	Rare Hb.	Mild anemia.
H145	Hb Zurich	Hemoglobin Zurich	Hb variant with abnormal stability.	Hemolytic anemia.
H146	Hb Tripoli	Hemoglobin Tripoli	Rare Hb variant.	Reported in Libya.
H147	Hb Gunma	Hemoglobin Gunma	Rare Hb variant.	Reported in Japan.
H148	Hb Okayama	Hemoglobin Okayama	Rare Hb variant.	Mild symptoms.
H149	Hb I	Hemoglobin I	Hb variant.	Benign finding.
H150	Hb Manila	Hemoglobin Manila	Hb variant.	Found in Philippines.
H151	HbC Dallas	Hemoglobin C Dallas	Hb variant.	Reported in USA.
H152	Hb Tarrant	Hemoglobin Tarrant	Hb variant.	High oxygen affinity.
H153	Hb Hamilton	Hemoglobin Hamilton	Hb variant.	Mild anemia.
H154	Hb M Boston	Hemoglobin M Boston	Hb variant.	Congenital cyanosis.
H155	Hb Denver	Hemoglobin Denver	Hb variant.	Rare case reports.
H156	Hb Ypsilanti	Hemoglobin Ypsilanti	High-affinity Hb variant.	Secondary erythrocytosis.
H157	Hb Montgomery	Hemoglobin Montgomery	Rare Hb.	Benign.
H158	Hb M Saskatoon	Hemoglobin M Saskatoon	Hb variant.	Congenital methemoglobinemia.
H159	Hb M Iwate	Hemoglobin M Iwate	Hb variant.	Cyanosis.
H160	Hb Santa Ana	Hemoglobin Santa Ana	Hb variant.	Mild anemia.
H161	Hb Dallas	Hemoglobin Dallas	Hb variant.	Rare report.
H162	Hb Durham	Hemoglobin Durham	Hb variant.	Mild anemia.
H163	Hb Santiago	Hemoglobin Santiago	Hb variant.	Rare finding.
H164	Hb Riyadh	Hemoglobin Riyadh	Hb variant.	Reported in Saudi Arabia.
H165	Hb Westmead	Hemoglobin Westmead	Hb variant.	Mild symptoms.
H166	Hb Perth	Hemoglobin Perth	Hb variant.	Rare.
H167	Hb Hofu	Hemoglobin Hofu	Hb variant.	Benign.
H168	Hb M Hyde Park	Hemoglobin M Hyde Park	Hb variant.	Cyanosis.
H169	Hb St. Louis	Hemoglobin St. Louis	Hb variant.	Rare report.
H170	Hb Madrid	Hemoglobin Madrid	Hb variant.	Mild anemia.
H171	Hb Rennes	Hemoglobin Rennes	Hb variant.	Rare.
H172	Hb Ankara	Hemoglobin Ankara	Hb variant.	Found in Turkey.
H173	Hb Bristol	Hemoglobin Bristol	Hb variant.	Hemolysis.
H174	Hb Shizuoka	Hemoglobin Shizuoka	Hb variant.	Rare report.
H175	Hb J-Paris	Hemoglobin J Paris	Hb variant.	Mild anemia.
H176	Hb Gun Hill II	Hemoglobin Gun Hill II	Hb variant.	Seen in Africa.
H177	Hb Gun Hill III	Hemoglobin Gun Hill III	Hb variant.	Rare.
H178	Hb Iran	Hemoglobin Iran	Hb variant.	Reported in Iran.
H179	Hb Kobe	Hemoglobin Kobe	Hb variant.	Mild symptoms.
H180	Hb Liverpool	Hemoglobin Liverpool	Hb variant.	Rare.
H181	Hb Olympia	Hemoglobin Olympia	Hb variant.	Mild anemia.
H182	Hb Rouen	Hemoglobin Rouen	Hb variant.	Rare.
H183	Hb Seattle	Hemoglobin Seattle	Hb variant.	Reported in USA.
H184	Hb Tours	Hemoglobin Tours	Hb variant.	Rare.
H185	Hb Utrecht	Hemoglobin Utrecht	Hb variant.	Rare.
H186	Hb Verona	Hemoglobin Verona	Hb variant.	Rare.
H187	Hb Warsaw	Hemoglobin Warsaw	Hb variant.	Rare.
H188	Hb Zagreb	Hemoglobin Zagreb	Hb variant.	Reported in Croatia.
H189	Hb Palermo	Hemoglobin Palermo	Hb variant.	Rare.
H190	Hb Richmond	Hemoglobin Richmond	Hb variant.	Rare.
H191	Hb Sydney	Hemoglobin Sydney	Hb variant.	Reported in Australia.
H192	Hb Tokyo	Hemoglobin Tokyo	Hb variant.	Rare.
H193	Hb Valencia	Hemoglobin Valencia	Hb variant.	Mild anemia.
H194	Hb York II	Hemoglobin York II	Hb variant.	Rare.
H195	Hb Zurich II	Hemoglobin Zurich II	Hb variant.	Rare.
H196	Hb Lyon	Hemoglobin Lyon	Hb variant.	Rare.
H197	Hb Berlin	Hemoglobin Berlin	Hb variant.	Rare.
H198	Hb Munich	Hemoglobin Munich	Hb variant.	Rare.
H199	Hb Vienna	Hemoglobin Vienna	Hb variant.	Rare.
H200	Hb Washington	Hemoglobin Washington	Hb variant.	Rare.