Internal Medicine Initialisms

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Internal Medicine Alphabet-C

S. No	Initialism	Full Form	Short Explanation	Practical Example
C001	CAD	Coronary Artery Disease	Narrowing/blockage of coronary arteries due to atherosclerosis.	Patient with chest pain diagnosed with CAD.
C002	CABG	Coronary Artery Bypass Grafting	Surgical procedure to bypass blocked coronary arteries.	Patient with triple-vessel disease underwent CABG.
C003	CHF	Congestive Heart Failure	Heart’s inability to pump blood effectively.	Dyspnea and edema indicated CHF.
C004	COPD	Chronic Obstructive Pulmonary Disease	Progressive lung disease causing airflow limitation.	Smoking history linked to COPD.
C005	CKD	Chronic Kidney Disease	Progressive, irreversible decline in kidney function.	Patient with diabetes developed CKD.
C006	CBC	Complete Blood Count	Common blood test analyzing red/white cells and platelets.	CBC ordered for anemia evaluation.
C007	CRP	C-Reactive Protein	Inflammatory biomarker measured in blood.	High CRP indicated systemic inflammation.
C008	CT	Computed Tomography	Imaging technique using X-rays for cross-sectional views.	CT scan used to rule out stroke.
C009	CTA	Computed Tomography Angiography	Imaging of blood vessels using CT and contrast.	CTA revealed carotid stenosis.
C010	CXR	Chest X-Ray	Basic imaging for lungs, heart, and thorax.	CXR showed pneumonia.
C011	CMV	Cytomegalovirus	Viral infection affecting immunocompromised patients.	CMV detected in transplant recipient.
C012	CNS	Central Nervous System	Includes brain and spinal cord.	CNS infection suspected in meningitis.
C013	CSF	Cerebrospinal Fluid	Fluid around brain and spinal cord.	CSF examined in lumbar puncture.
C014	CVA	Cerebrovascular Accident	Stroke due to impaired brain blood supply.	CVA confirmed by CT scan.
C015	CK	Creatine Kinase	Enzyme elevated in muscle damage.	CK high in myocardial infarction.
C016	CK-MB	Creatine Kinase–Myocardial Band	Cardiac-specific isoenzyme.	CK-MB used in MI diagnosis.
C017	CPK	Creatine Phosphokinase	Another term for CK.	CPK tested after muscle injury.
C018	CRRT	Continuous Renal Replacement Therapy	Dialysis method for critically ill patients.	ICU patient placed on CRRT.
C019	CRF	Chronic Renal Failure	End-stage kidney disease.	CRF patient required dialysis.
C020	CAB	Community-Acquired Bacteremia	Blood infection acquired outside hospital.	CAB documented in septicemia case.
C021	CAP	Community-Acquired Pneumonia	Pneumonia acquired outside hospital.	CAP treated with antibiotics.
C022	CAUTI	Catheter-Associated Urinary Tract Infection	UTI due to prolonged catheter use.	CAUTI prevented with sterile technique.
C023	CML	Chronic Myeloid Leukemia	Cancer of bone marrow producing abnormal WBCs.	CML treated with imatinib.
C024	CLL	Chronic Lymphocytic Leukemia	Slow-growing blood cancer of lymphocytes.	CLL managed with targeted therapy.
C025	CTCL	Cutaneous T-Cell Lymphoma	Rare skin cancer of T lymphocytes.	Patient presented with CTCL skin lesions.
C026	CEA	Carcinoembryonic Antigen	Tumor marker for colorectal cancer.	CEA used in cancer follow-up.
C027	CA-125	Cancer Antigen 125	Tumor marker for ovarian cancer.	Elevated CA-125 suggested ovarian carcinoma.
C028	CA-19-9	Cancer Antigen 19-9	Tumor marker for pancreatic cancer.	CA-19-9 tracked disease progression.
C029	CA-15-3	Cancer Antigen 15-3	Tumor marker for breast cancer.	CA-15-3 monitored recurrence.
C030	CRVO	Central Retinal Vein Occlusion	Eye condition causing sudden vision loss.	CRVO detected in hypertensive patient.
C031	CRAO	Central Retinal Artery Occlusion	Sudden blindness due to artery blockage.	CRAO diagnosed in emergency.
C032	CPK-MM	Creatine Phosphokinase Muscle Isoenzyme	Isoenzyme of skeletal muscle.	CPK-MM elevated in rhabdomyolysis.
C033	CPK-BB	Creatine Phosphokinase Brain Isoenzyme	Isoenzyme of brain tissue.	CPK-BB measured in brain injury.
C034	CXR-PA	Chest X-Ray Posteroanterior	Standard view in CXR.	CXR-PA used in routine checkup.
C035	CXR-LAT	Chest X-Ray Lateral	Side view chest imaging.	CXR-LAT performed to assess mass.
C036	CVD	Cardiovascular Disease	Diseases affecting heart and vessels.	Lifestyle changes prevent CVD.
C037	CADASIL	Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy	Genetic stroke disorder.	CADASIL confirmed by genetic testing.
C038	CPK-NAC	Creatine Phosphokinase-N-Acetylcysteine	Method for CK assay.	CPK-NAC used in labs.
C039	CMR	Cardiac Magnetic Resonance	Advanced imaging for heart structures.	CMR revealed myocarditis.
C040	CCT	Cardiac Computed Tomography	Imaging of heart and vessels.	CCT evaluated coronary arteries.
C041	CAG	Coronary Angiography	Imaging test for coronary arteries.	CAG showed severe LAD blockage.
C042	CRT	Cardiac Resynchronization Therapy	Pacemaker for heart failure.	CRT improved LVEF in CHF patient.
C043	CVP	Central Venous Pressure	Pressure in thoracic vena cava.	CVP measured with central line.
C044	CPAP	Continuous Positive Airway Pressure	Breathing support for sleep apnea.	CPAP prescribed for OSA.
C045	CAB	Calcium-Activated Blocker	Drug affecting calcium channels.	CAB trialed in arrhythmia.
C046	CABGx3	Coronary Artery Bypass Graft ×3	Triple bypass surgery.	Patient underwent CABGx3.
C047	CAGB	Chronic Atrophic Gastritis with B12 deficiency	Gastritis leading to anemia.	CAGB treated with vitamin B12.
C048	CAT	Computerized Axial Tomography	Another term for CT.	CAT scan ordered for trauma.
C049	CAV	Cardiac Allograft Vasculopathy	Graft complication post-transplant.	CAV monitored in transplant patient.
C050	CPK-R	Creatine Phosphokinase Reactive	Specific enzyme variation.	CPK-R studied in labs.
C051	CCM	Congenital Cystic Malformation	Rare lung malformation.	CCM detected on fetal scan.
C052	CCS	Canadian Cardiovascular Society	Classification of angina severity.	Angina graded using CCS.
C053	CCH	Congenital Chloride Diarrhea	Genetic diarrhea disorder.	CCH confirmed by stool chloride test.
C054	CCI	Charlson Comorbidity Index	Predicts mortality based on comorbidities.	High CCI predicted poor outcome.
C055	CCP	Cyclic Citrullinated Peptide	Antibody test for rheumatoid arthritis.	CCP antibodies positive in RA.
C056	CCU	Coronary Care Unit	Specialized cardiac ICU.	Patient admitted to CCU after MI.
C057	CDI	Clostridioides difficile Infection	Infection causing severe diarrhea.	CDI treated with vancomycin.
C058	CDR	Clinical Dementia Rating	Scale for dementia severity.	CDR 2 indicated moderate dementia.
C059	CDK	Cyclin-Dependent Kinase	Protein regulating cell cycle.	CDK inhibitors used in oncology.
C060	CD4	Cluster of Differentiation 4	Immune marker for T-helper cells.	CD4 count low in HIV patient.

S. No	Initialism	Full Form	Short Explanation	Practical Example
C061	CD8	Cluster of Differentiation 8	Cytotoxic T-cell marker.	CD8 count monitored in HIV patient.
C062	CF	Cystic Fibrosis	Genetic disorder affecting lungs and pancreas.	CF diagnosed in child with recurrent infections.
C063	CFT	Complement Fixation Test	Lab test for antibodies.	CFT used for syphilis in past.
C064	CFS	Chronic Fatigue Syndrome	Condition with severe persistent fatigue.	CFS managed with lifestyle therapy.
C065	CHD	Coronary Heart Disease	Narrowing of coronary arteries.	CHD detected in smoker with angina.
C066	CHB	Complete Heart Block	Severe conduction abnormality in heart.	Pacemaker inserted for CHB.
C067	CHC	Chronic Hepatitis C	Viral liver disease.	CHC treated with antivirals.
C068	CHO	Carbohydrate	Macronutrient for energy.	Diabetic patient advised controlled CHO intake.
C069	CHOIR	Correction of Hemoglobin and Outcomes in Renal Insufficiency	Clinical trial in nephrology.	CHOIR showed risks with high Hb targets.
C070	CI	Cardiac Index	Cardiac output per body surface area.	Low CI indicated heart failure.
C071	CIDP	Chronic Inflammatory Demyelinating Polyneuropathy	Neuropathy with progressive weakness.	CIDP treated with IVIG.
C072	CIN	Contrast-Induced Nephropathy	Kidney injury after contrast exposure.	CIN prevented with hydration.
C073	CIP	Community-Acquired Pneumonia (alt. term)	Infection outside hospital.	Elderly admitted with CIP.
C074	CKI	Chronic Kidney Insufficiency	Early kidney dysfunction.	CKI detected by reduced GFR.
C075	CLABSI	Central Line-Associated Bloodstream Infection	Blood infection due to central venous catheter.	CLABSI prevented with sterile technique.
C076	CLD	Chronic Liver Disease	Progressive liver damage.	Alcohol abuse caused CLD.
C077	CLLS	Chronic Lymphocytic Leukemia Syndrome	Systemic effects of CLL.	Patient had fatigue due to CLLS.
C078	CMML	Chronic Myelomonocytic Leukemia	Rare blood cancer with monocytosis.	CMML confirmed by bone marrow biopsy.
C079	CMP	Cardiomyopathy	Heart muscle disease.	CMP caused arrhythmias.
C080	CMPA	Cow’s Milk Protein Allergy	Food allergy seen in infants.	CMPA caused diarrhea in baby.
C081	CMV-IgG	Cytomegalovirus Immunoglobulin G	Antibody indicating past infection.	Positive CMV-IgG in pregnant woman.
C082	CMV-IgM	Cytomegalovirus Immunoglobulin M	Antibody indicating acute infection.	CMV-IgM elevated in fever case.
C083	CN	Cranial Nerve	12 paired nerves emerging from brain.	CN VII palsy seen in Bell’s palsy.
C084	CNSL	Central Nervous System Lymphoma	Rare lymphoma of brain/spinal cord.	HIV patient developed CNSL.
C085	COHb	Carboxyhemoglobin	Hemoglobin bound to CO.	COHb elevated in carbon monoxide poisoning.
C086	COI	Conflict of Interest	Declared in medical research.	Physician disclosed COI in trial.
C087	COPD-X	COPD-X Guidelines	Australian guidelines for COPD management.	COPD-X used in clinic protocols.
C088	COX	Cyclooxygenase	Enzyme in prostaglandin synthesis.	COX-2 inhibitors used in arthritis.
C089	CP	Cerebral Palsy	Non-progressive motor disorder from brain injury.	CP child received physiotherapy.
C090	CPE	Cardiopulmonary Exercise Test	Assesses exercise capacity.	CPE done before cardiac rehab.
C091	CPET	Cardiopulmonary Exercise Testing	Synonym for CPE.	CPET identified exercise limitation.
C092	CPI	Checkpoint Inhibitor	Immunotherapy for cancer.	CPI therapy used in melanoma.
C093	CPHD	Congenital Pituitary Hormone Deficiency	Endocrine disorder in newborns.	CPHD treated with hormone replacement.
C094	CPIS	Clinical Pulmonary Infection Score	Tool for diagnosing pneumonia.	CPIS used in ICU.
C095	CPR	Cardiopulmonary Resuscitation	Emergency life-saving technique.	Bystander performed CPR.
C096	CPS	Child Protective Services	Social service for child safety.	Hospital contacted CPS in abuse case.
C097	CPSS	Cincinnati Prehospital Stroke Scale	Screening tool for stroke.	CPSS used in ambulance triage.
C098	CPT	Current Procedural Terminology	Medical coding system.	Doctor billed visit using CPT codes.
C099	CPX	Cardiopulmonary Exercise	Stress test for lungs and heart.	CPX done in CHF patient.
C100	CR	Complete Response	No detectable disease post-treatment.	Cancer patient achieved CR.
C101	CRC	Colorectal Cancer	Cancer of colon or rectum.	CRC screening done with colonoscopy.
C102	CRD	Chronic Respiratory Disease	Persistent lung condition.	CRD worsened with pollution.
C103	CRE	Carbapenem-Resistant Enterobacteriaceae	Multidrug-resistant bacteria.	CRE outbreak in ICU.
C104	CREST	Calcinosis, Raynaud’s, Esophageal Dysmotility, Sclerodactyly, Telangiectasia	Limited form of systemic sclerosis.	CREST syndrome diagnosed in rheumatology clinic.
C105	CRH	Corticotropin-Releasing Hormone	Hormone from hypothalamus stimulating ACTH.	CRH tested in endocrine study.
C106	CRI	Chronic Renal Insufficiency	Early stage kidney dysfunction.	CRI diagnosed by eGFR.
C107	CRNA	Certified Registered Nurse Anesthetist	Advanced nurse in anesthesia.	Surgery assisted by CRNA.
C108	CRPC	Castration-Resistant Prostate Cancer	Prostate cancer not responding to hormones.	CRPC treated with chemotherapy.
C109	CRT-D	Cardiac Resynchronization Therapy with Defibrillator	Pacemaker + ICD combination.	CRT-D implanted in CHF patient.
C110	CRVO	Central Retinal Vein Occlusion	Vascular blockage in retina.	CRVO treated with anti-VEGF injection.
C111	CS	Cesarean Section	Surgical delivery of baby.	Woman delivered via CS.
C112	CSA	Central Sleep Apnea	Sleep disorder with impaired brain signals.	CSA treated with adaptive ventilation.
C113	CSF-LD	CSF Lactate Dehydrogenase	Marker in meningitis.	CSF-LD elevated in bacterial meningitis.
C114	CSH	Carotid Sinus Hypersensitivity	Exaggerated response causing syncope.	Elderly collapsed due to CSH.
C115	CSI	Corticosteroid Injection	Local anti-inflammatory therapy.	CSI given for knee arthritis.
C116	CSII	Continuous Subcutaneous Insulin Infusion	Insulin pump therapy.	CSII prescribed in type 1 diabetes.
C117	CSO	Chief Scientific Officer	Senior role in healthcare organizations.	CSO led new drug development.
C118	CSP	Cervical Spondylosis	Age-related degeneration of cervical spine.	CSP caused neck stiffness.
C119	CSRF	Cerebrospinal Fluid Rhinorrhea	CSF leak through nose.	CSRF detected after trauma.
C120	CTCAE	Common Terminology Criteria for Adverse Events	Oncology grading system.	CTCAE grade 3 toxicity documented.
C121	CTE	Chronic Traumatic Encephalopathy	Brain degeneration due to repeated trauma.	CTE suspected in retired boxer.
C122	CTG	Cardiotocography	Monitors fetal heart rate and contractions.	CTG used in labor monitoring.
C123	CTI	Cavotricuspid Isthmus	Cardiac conduction pathway.	CTI ablation done in atrial flutter.
C124	CTLA-4	Cytotoxic T-Lymphocyte Antigen 4	Immune checkpoint receptor.	CTLA-4 inhibitors used in cancer therapy.
C125	CTN	Calcitonin	Hormone regulating calcium.	Elevated CTN suggested medullary thyroid cancer.
C126	CTR	Carpal Tunnel Release	Surgery for carpal tunnel syndrome.	CTR improved hand numbness.
C127	CTS	Carpal Tunnel Syndrome	Compression neuropathy of median nerve.	CTS caused tingling in hand.
C128	CTV	Computed Tomography Venography	CT imaging of veins.	CTV done for DVT evaluation.
C129	CV	Cardiovascular	Related to heart and vessels.	CV risk factors include smoking.
C130	CVID	Common Variable Immunodeficiency	Primary immunodeficiency disorder.	CVID patient had recurrent infections.
C131	CVP	Central Venous Pressure	Measurement of venous return.	CVP catheter inserted in ICU.
C132	CVR	Cerebrovascular Resistance	Resistance of brain vessels.	CVR studied in stroke patients.
C133	CVS	Cardiovascular System	Circulatory system of body.	CVS exam revealed murmurs.
C134	CVST	Cerebral Venous Sinus Thrombosis	Clot in brain venous sinuses.	CVST diagnosed with MRV.
C135	CVVH	Continuous Veno-Venous Hemofiltration	ICU dialysis therapy.	CVVH started for septic shock with renal failure.
C136	CVVHDF	Continuous Veno-Venous Hemodiafiltration	Dialysis combining convection + diffusion.	CVVHDF used in multi-organ failure.
C137	CWMS	Classic Wernicke’s Mental State	Triad of confusion, ataxia, nystagmus.	CWMS seen in alcoholic patient.
C138	CWP	Coal Workers’ Pneumoconiosis	Occupational lung disease.	Miner developed CWP.
C139	CWS	Cytoplasmic Welling Syndrome	Rare cellular condition.	CWS reported in pathology.
C140	CXCL	Chemokine Ligand	Immune signaling molecule.	CXCL involved in inflammation.
C141	CXR-AP	Chest X-Ray Anteroposterior	Supine view of chest.	CXR-AP done in ICU patient.
C142	CYP	Cytochrome P450	Liver enzymes metabolizing drugs.	CYP450 interaction altered drug dose.
C143	CYP2D6	Cytochrome P450 2D6	Enzyme affecting drug metabolism.	CYP2D6 polymorphism caused drug resistance.
C144	CYP3A4	Cytochrome P450 3A4	Major enzyme in liver metabolism.	CYP3A4 inhibitor increased drug toxicity.
C145	CYP1A2	Cytochrome P450 1A2	Enzyme involved in caffeine metabolism.	CYP1A2 activity studied in smokers.
C146	CYP2C19	Cytochrome P450 2C19	Drug metabolism enzyme.	CYP2C19 poor metabolizer failed clopidogrel therapy.
C147	CYP2C9	Cytochrome P450 2C9	Metabolizes warfarin.	CYP2C9 testing guided dosing.
C148	CYP2E1	Cytochrome P450 2E1	Enzyme metabolizing alcohol.	CYP2E1 induced in chronic drinkers.
C149	CYP450	Cytochrome P450 Family	Collective drug-metabolizing enzymes.	CYP450 crucial in pharmacology.
C150	CZP	Certolizumab Pegol	Anti-TNF biologic drug.	CZP used for rheumatoid arthritis.
C151	CZI	Cytomegalovirus Infection	Alternate short form in notes.	CZI treated with antivirals.
C152	Cx	Cervix	Part of female reproductive tract.	Cx examined during Pap smear.
C153	CxR	Cervical Rib	Extra rib causing compression.	CxR noted in thoracic outlet syndrome.
C154	CxS	Culture and Sensitivity	Microbiology test for infections.	CxS ordered for UTI.
C155	CxT	Cervical Traction	Therapy for cervical spine disease.	CxT relieved neck pain.
C156	CxU	Culture Urine	Lab test for UTI.	CxU positive for E. coli.
C157	CxV	Cerebral Venogram	Imaging of brain veins.	CxV done in suspected CVST.
C158	CxW	Cervical Wart	HPV-related genital wart.	CxW treated with cryotherapy.
C159	CxZ	Cervical Zone	Area of cervix in pathology.	Biopsy taken from CxZ.
C160	CZIgG	Cytomegalovirus Immunoglobulin G	Antibody marker for CMV.	Positive CZIgG confirmed past exposure.
C161	CZIgM	Cytomegalovirus Immunoglobulin M	Acute CMV antibody.	CZIgM positive in fever case.
C162	CVO	Cardiac Valve Obstruction	Blockage of heart valves.	CVO treated with surgery.
C163	CVH	Chronic Viral Hepatitis	Long-term hepatitis infection.	CVH patient treated with antivirals.
C164	CVDP	Cardiovascular Disease Prevention	Public health initiative.	CVDP promoted by WHO.
C165	CVFX	Cerebrovascular Infarction	Medical code for stroke.	CT showed CVFX in MCA territory.
C166	CVC	Central Venous Catheter	Line inserted into central vein.	CVC placed for IV medications.
C167	CVDM	Cardiovascular Disease Management	Clinical care protocols.	CVDM implemented in hospital.
C168	CVDS	Cardiovascular Diseases	Plural term for heart/vessel diseases.	CVDS include hypertension, CAD.
C169	CVDx	Cardiovascular Diagnosis	Diagnostic approach to CV diseases.	ECG used for CVDx.
C170	CVO2	Central Venous Oxygen Content	Oxygen level in central veins.	CVO2 monitored in shock.
C171	CVP-R	Central Venous Pressure Reading	Measurement of venous pressure.	CVP-R noted as 12 cmH₂O.
C172	CVRM	Cardiovascular Risk Management	Approach to reduce CVD risk.	CVRM includes diet and exercise.
C173	CVRx	Cardiovascular Reflex	Autonomic regulation of heart.	CVRx studied in syncope.
C174	CVSG	Cardiovascular Surgery Group	Specialized surgical team.	CVSG performed valve replacement.
C175	CVSS	Cardiovascular Symptom Score	Scoring system for severity.	CVSS assessed before treatment.
C176	CVT	Cerebral Venous Thrombosis	Clot in brain veins.	CVT diagnosed via MRV.
C177	CVTI	Cardiovascular Therapy Intervention	General term for treatments.	CVTI included stenting.
C178	CVTO	Cardiovascular Toxicity	Side effect of drugs.	Chemo patient developed CVTO.
C179	CVTR	Cardiovascular Training	Rehabilitation exercise.	CVTR used in cardiac rehab.
C180	CVTS	Cardiovascular Thoracic Surgery	Specialty of heart-lung surgery.	CVTS conference held annually.
C181	CVW	Clinical Viability Weight	Parameter in patient care.	CVW recorded in malnutrition case.
C182	CW	Chest Wall	External thoracic region.	CW tenderness in rib fracture.
C183	CWF	Coagulation Workup Factor	Part of clotting studies.	CWF tested in hemophilia.
C184	CXR-F	Chest X-Ray Frontal	Standard chest imaging.	CXR-F showed cardiomegaly.
C185	CXR-L	Chest X-Ray Lateral	Lateral projection of thorax.	CXR-L ordered for mass evaluation.
C186	CXR-O	Chest X-Ray Oblique	Oblique chest imaging view.	CXR-O done for rib lesion.
C187	CXR-P	Chest X-Ray Portable	Bedside CXR.	CXR-P used in ICU.
C188	CXR-S	Chest X-Ray Supine	Supine position CXR.	Trauma patient had CXR-S.
C189	CXR-U	Chest X-Ray Upright	Standing X-ray for air-fluid levels.	CXR-U showed pneumoperitoneum.
C190	CYFRA	Cytokeratin-19 Fragment	Tumor marker for lung cancer.	CYFRA levels monitored in NSCLC.
C191	CYPD	Cyclophilin D	Mitochondrial protein.	CYPD studied in apoptosis research.
C192	CYSL	Cystinuria	Genetic kidney disorder with cystine stones.	CYSL detected by stone analysis.
C193	CYS	Cysteine	Amino acid.	CYS tested in metabolic disorder.
C194	CYT	Cytology	Microscopic study of cells.	Pap smear is a CYT test.
C195	CYTB	Cytochrome B	Mitochondrial enzyme.	CYTB mutation linked to myopathy.
C196	CYTC	Cytotoxic	Refers to cell-killing immune cells.	CYTC activity in CD8+ T cells.
C197	CYTO	Cytogenetics	Study of chromosomes.	CYTO analysis done in leukemia.
C198	CYT-P	Cytotoxic Panel	Immunology test.	CYT-P performed in oncology.
C199	CYTR	Cytarabine	Chemotherapy drug.	CYTR used in AML.
C200	CYX	Cyclophosphamide	Chemotherapy and immunosuppressant drug.	CYX given in lupus nephritis.