Internal Medicine Abbreviations

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Internal Medicine Alphabet – C

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
C001	CABG	Coronary Artery Bypass Grafting	Surgery to restore blood flow to heart	CABG done in triple-vessel CAD.
C002	CAD	Coronary Artery Disease	Atherosclerosis of coronary arteries	CAD causes angina and MI.
C003	CAF	Chronic Atrial Fibrillation	Long-standing atrial fibrillation	CAF increases risk of stroke.
C004	CAL	Chronic Airway Limitation	Obstructive lung disease term	CAL includes COPD.
C005	CAM	Complementary and Alternative Medicine	Non-conventional therapies	Acupuncture is a CAM approach.
C006	CAP	Community-Acquired Pneumonia	Pneumonia contracted outside hospital	CAP treated with macrolides.
C007	CAR	Chimeric Antigen Receptor	Engineered receptor for immunotherapy	CAR-T therapy used in leukemia.
C008	CAT	Computerized Axial Tomography	Imaging scan technique	CAT scan detects brain lesions.
C009	CAV	Coronary Artery Vasospasm	Spasm of coronary arteries	CAV causes Prinzmetal angina.
C010	CBC	Complete Blood Count	Basic hematology panel	CBC shows WBC, Hb, platelets.
C011	CBF	Cerebral Blood Flow	Blood supply to the brain	CBF reduced in ischemia.
C012	CBG	Capillary Blood Glucose	Point-of-care glucose test	CBG monitoring in diabetics.
C013	CBP	Complete Biochemical Profile	Lab chemistry panel	CBP checks liver and kidney function.
C014	CBV	Cerebral Blood Volume	Volume of blood in brain tissue	CBV measured in stroke imaging.
C015	CC	Chief Complaint	Main symptom patient reports	CC recorded in medical history.
C016	CCF	Congestive Cardiac Failure	Heart unable to pump efficiently	CCF causes edema and dyspnea.
C017	CCHD	Critical Congenital Heart Disease	Severe heart defects present at birth	CCHD detected via pulse oximetry.
C018	CCU	Coronary Care Unit	Specialized hospital unit for cardiac patients	CCU admission for unstable angina.
C019	CCT	Cardiac Computed Tomography	Imaging modality for heart	CCT used for calcium scoring.
C020	CD	Crohn’s Disease	Inflammatory bowel disease	CD causes abdominal pain and diarrhea.
C021	CDC	Centers for Disease Control and Prevention	US federal health agency	CDC publishes infection guidelines.
C022	CDDP	Cisplatin (Cis-Diamminedichloroplatinum)	Chemotherapy drug	CDDP causes nephrotoxicity.
C023	CDH	Congenital Diaphragmatic Hernia	Birth defect with abdominal contents in chest	CDH causes neonatal respiratory distress.
C024	CDI	Clostridioides difficile Infection	Antibiotic-associated colitis	CDI treated with vancomycin.
C025	CDR	Clinical Dementia Rating	Scale for dementia severity	CDR 2 = moderate dementia.
C026	CEA	Carcinoembryonic Antigen	Tumor marker for colorectal cancer	CEA monitored post-surgery.
C027	CEBM	Centre for Evidence-Based Medicine	Institution promoting EBM	CEBM Oxford provides guidelines.
C028	CEI	Cardiac Ejection Index	Measurement of heart pumping efficiency	CEI assessed in ICU monitoring.
C029	CEL	Celiac Disease	Autoimmune gluten intolerance	CEL patients avoid gluten diet.
C030	CEM	Clinical Examination	Physical assessment of patient	CEM includes auscultation and palpation.
C031	CEP	Chronic Eosinophilic Pneumonia	Rare inflammatory lung disease	CEP shows peripheral lung infiltrates.
C032	CER	Cost-Effectiveness Ratio	Healthcare economic measure	CER used to assess new treatments.
C033	CF	Cystic Fibrosis	Genetic disorder affecting lungs and pancreas	CF patients require chest physiotherapy.
C034	CFC	Complement Fixation Test	Diagnostic immunology test	CFC used for parasitic infections.
C035	CFF	Critical Flicker Fusion	Test of visual processing speed	CFF reduced in hepatic encephalopathy.
C036	CFS	Chronic Fatigue Syndrome	Prolonged unexplained fatigue disorder	CFS impacts quality of life.
C037	CGA	Comprehensive Geriatric Assessment	Holistic evaluation of elderly patients	CGA includes physical and cognitive testing.
C038	CGB	Chorionic Gonadotropin Beta	Hormone measured in pregnancy/oncology	CGB elevated in trophoblastic disease.
C039	CGM	Continuous Glucose Monitoring	Device tracking glucose levels	CGM helps in diabetes management.
C040	CH	Cluster Headache	Severe unilateral headache disorder	CH treated with oxygen and triptans.
C041	CHADS₂	Congestive HF, Hypertension, Age, Diabetes, Stroke Score	Stroke risk scoring system	CHADS₂ ≥2 indicates anticoagulation.
C042	CHC	Combined Hormonal Contraceptive	Birth control pill with estrogen + progestin	CHC contraindicated in smokers >35 yrs.
C043	CHF	Congestive Heart Failure	Inability of heart to pump adequately	CHF causes pulmonary edema.
C044	CHO	Carbohydrate	Macronutrient metabolized into glucose	Diabetics restrict CHO intake.
C045	CHOP	Cyclophosphamide, Doxorubicin, Vincristine, Prednisone	Chemotherapy regimen	CHOP used in non-Hodgkin lymphoma.
C046	CHS	Cannabinoid Hyperemesis Syndrome	Recurrent vomiting in cannabis users	CHS relieved by hot showers.
C047	CI	Cardiac Index	CO/body surface area measurement	Low CI in cardiogenic shock.
C048	CIA	Chronic Idiopathic Anemia	Long-term anemia with no clear cause	CIA requires supportive treatment.
C049	CIB	Chronic Infectious Bronchitis	Long-standing airway infection	CIB seen in smokers.
C050	CIC	Chronic Ischemic Cardiomyopathy	LV dysfunction due to CAD	CIC managed with revascularization.
C051	CIDP	Chronic Inflammatory Demyelinating Polyneuropathy	Immune-mediated neuropathy	CIDP treated with IVIG.
C052	CIM	Critical Illness Myopathy	Muscle weakness in ICU patients	CIM complicates prolonged ventilation.
C053	CIN	Cervical Intraepithelial Neoplasia	Precancerous cervical lesion	CIN detected on Pap smear.
C054	CIP	Community Infections Program	Public health surveillance system	CIP tracks influenza cases.
C055	CIR	Case Incidence Rate	Epidemiological measure	CIR reported during outbreaks.
C056	CIS	Carcinoma In Situ	Pre-invasive stage of cancer	CIS found in bladder carcinoma.
C057	CJD	Creutzfeldt–Jakob Disease	Fatal prion disease	CJD causes rapidly progressive dementia.
C058	CK	Creatine Kinase	Muscle enzyme elevated in injury	CK elevated in rhabdomyolysis.
C059	CKD	Chronic Kidney Disease	Gradual decline in kidney function	CKD staged by eGFR.
C060	CLL	Chronic Lymphocytic Leukemia	Indolent blood cancer	CLL causes lymphocytosis.
C061	CLP	Cleft Lip and Palate	Birth defect of mouth structure	CLP repaired surgically.
C062	CM	Cardiomyopathy	Group of heart muscle diseases	Dilated CM common in alcoholics.
C063	CMA	Complement-Mediated Anemia	Hemolysis due to complement activation	CMA seen in autoimmune hemolysis.
C064	CMC	Carboxymethyl Cellulose	Pharmaceutical excipient	CMC used in eye drops.
C065	CML	Chronic Myeloid Leukemia	Blood cancer with Philadelphia chromosome	CML treated with imatinib.
C066	CMML	Chronic Myelomonocytic Leukemia	Rare hematological malignancy	CMML presents with monocytosis.
C067	CMR	Cardiac Magnetic Resonance	Imaging test for heart	CMR detects myocardial fibrosis.
C068	CMS	Centers for Medicare and Medicaid Services	US health insurance body	CMS regulates hospital reimbursements.
C069	CMV	Cytomegalovirus	Opportunistic viral infection	CMV reactivates in transplant patients.
C070	CN	Cranial Nerve	Nerves emerging from brainstem	CN VII controls facial movement.
C071	CNA	Certified Nursing Assistant	Support healthcare worker	CNA assists with patient care.
C072	CNC	Clinical Nurse Consultant	Senior nursing role	CNC leads specialty clinics.
C073	CNG	Chronic Nasal Granuloma	Inflammatory lesion in nose	CNG occurs in Wegener’s disease.
C074	CNI	Calcineurin Inhibitor	Class of immunosuppressants	Tacrolimus is a CNI.
C075	CNL	Chronic Neutrophilic Leukemia	Rare myeloproliferative neoplasm	CNL presents with leukocytosis.
C076	CNN	Cortical Nephron Number	Measure of kidney filtering units	CNN reduced in CKD.
C077	CNP	C-type Natriuretic Peptide	Vasodilatory cardiac peptide	CNP regulates vascular tone.
C078	CNS	Central Nervous System	Brain + spinal cord	CNS infections include meningitis.
C079	CNV	Choroidal Neovascularization	Pathologic eye blood vessel growth	CNV seen in AMD.
C080	CO	Cardiac Output	Blood pumped per minute by heart	CO = HR × SV.
C081	COAD	Chronic Obstructive Airways Disease	Older term for COPD	COAD seen in smokers.
C082	COHb	Carboxyhemoglobin	Hemoglobin bound to CO	Elevated COHb in CO poisoning.
C083	COPD	Chronic Obstructive Pulmonary Disease	Progressive airflow limitation	COPD managed with inhalers.
C084	COR	Clinical Outcome Research	Study of treatment outcomes	COR influences guidelines.
C085	CP	Cerebral Palsy	Neurological disorder of movement	CP causes spasticity.
C086	CPA	Cardiopulmonary Arrest	Sudden cessation of heart activity	CPA requires CPR.
C087	CPAP	Continuous Positive Airway Pressure	Airway pressure for sleep apnea	CPAP prevents OSA episodes.
C088	CPD	Chronic Pulmonary Disease	General term for lung pathology	CPD causes breathlessness.
C089	CPE	Cardiopulmonary Exercise Testing	Evaluates fitness and heart-lung reserve	CPE done in pre-transplant workup.
C090	CPK	Creatine Phosphokinase	Enzyme elevated in muscle injury	CPK elevated in MI.
C091	CPR	Cardiopulmonary Resuscitation	Emergency procedure in cardiac arrest	CPR saves lives in sudden collapse.
C092	CPS	Child Protective Services	Agency ensuring child safety	Physicians notify CPS in abuse cases.
C093	CPT	Current Procedural Terminology	Medical billing codes	CPT codes used in US hospitals.
C094	CPX	Cardiopulmonary Exercise Test	Synonym for CPE	CPX assesses heart-lung capacity.
C095	CR	Complete Remission	Absence of disease symptoms	Leukemia patients achieve CR post-therapy.
C096	CRF	Chronic Renal Failure	Older term for advanced CKD	CRF patients need dialysis.
C097	CRH	Corticotropin-Releasing Hormone	Hormone regulating ACTH secretion	CRH stimulated in stress.
C098	CRI	Chronic Renal Insufficiency	Moderate kidney dysfunction	CRI precedes ESRD.
C099	CRP	C-Reactive Protein	Inflammatory biomarker	CRP elevated in infections.
C100	CRT	Cardiac Resynchronization Therapy	Device therapy for heart failure	CRT improves LV function.

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
C101	CSA	Cyclosporine A	Immunosuppressant used in transplants	CSA prevents kidney graft rejection.
C102	CSF	Cerebrospinal Fluid	Clear fluid surrounding brain and spinal cord	CSF analysis detects meningitis.
C103	CSI	Corticosteroid Injection	Local anti-inflammatory therapy	CSI used in knee arthritis.
C104	CSM	Cervical Spondylotic Myelopathy	Spinal cord compression due to degeneration	CSM causes gait imbalance.
C105	CSP	Clinical Study Protocol	Document describing a clinical trial	CSP approved before research begins.
C106	CSR	Cardiac Stress Response	Physiological response to exercise or stress	CSR measured during treadmill test.
C107	CSS	Clinical Scoring System	Standardized scale for disease severity	CSS used in stroke severity rating.
C108	CT	Computed Tomography	Advanced X-ray imaging technique	CT scan detects lung nodules.
C109	CTA	Computed Tomography Angiography	Imaging of blood vessels with CT	CTA used in PE diagnosis.
C110	CTC	Circulating Tumor Cells	Cancer cells in bloodstream	CTC measured in metastatic breast cancer.
C111	CTE	Chronic Traumatic Encephalopathy	Brain degeneration from repeated trauma	CTE seen in athletes.
C112	CTG	Cardiotocography	Fetal monitoring of HR and contractions	CTG used in labor ward.
C113	CTH	Computed Tomography Head	Brain imaging test	CTH done in stroke suspicion.
C114	CTL	Cytotoxic T Lymphocyte	Immune cell killing virus-infected/cancer cells	CTL active in viral clearance.
C115	CTM	Continue To Monitor	Clinical follow-up instruction	Patient kept under CTM for arrhythmia.
C116	CTN	Clinical Trial Network	Group conducting research studies	CTN coordinates multicenter trials.
C117	CTO	Chronic Total Occlusion	Complete long-standing arterial blockage	CTO PCI performed in cardiology.
C118	CTP	Child–Turcotte–Pugh Score	Prognostic score in cirrhosis	CTP class C = poor survival.
C119	CTR	Carpal Tunnel Release	Surgery for median nerve compression	CTR relieves wrist pain.
C120	CTS	Carpal Tunnel Syndrome	Median nerve entrapment at wrist	CTS causes numbness in hand.
C121	CTV	Computed Tomography Venography	Imaging veins with CT	CTV detects DVT extension.
C122	CUA	Canadian Urological Association	Professional body for urology	CUA guidelines guide practice.
C123	CUB	Cuffed Urethral Balloon	Device in urology procedures	CUB used in prostate surgery.
C124	CUC	Chronic Ulcerative Colitis	Inflammatory bowel disease	CUC causes bloody diarrhea.
C125	CUE	Clinical Urine Examination	Routine urine lab test	CUE detects proteinuria.
C126	CUF	Cutaneous Ulcer Formation	Skin breakdown with ulceration	CUF seen in diabetes.
C127	CUI	Chronic Urinary Incontinence	Long-term involuntary urine leakage	CUI common in elderly women.
C128	CUL	Cumulative Dose	Total drug dose over time	CUL tracked for anthracyclines.
C129	CUP	Cancer of Unknown Primary	Malignancy with unidentified origin	CUP diagnosed via biopsy.
C130	CURB-65	Confusion, Urea, Respiratory rate, BP, Age >65	Score predicting pneumonia severity	CURB-65 ≥3 indicates hospitalization.
C131	CVC	Central Venous Catheter	Tube placed in central vein	CVC used for drug infusion.
C132	CVE	Cerebrovascular Event	Stroke or TIA	CVE presents with sudden weakness.
C133	CVF	Chronic Venous Failure	Venous circulation disorder	CVF causes leg ulcers.
C134	CVI	Chronic Venous Insufficiency	Poor venous return from legs	CVI leads to varicose veins.
C135	CVP	Central Venous Pressure	Pressure in central veins	CVP monitoring in ICU.
C136	CVR	Cardiovascular Risk	Probability of developing heart disease	CVR reduced by lifestyle modification.
C137	CVS	Cardiovascular System	Heart and blood vessels	CVS exam includes heart sounds.
C138	CWA	Cold Water Agglutinin	Autoantibody causing hemolysis	CWA seen in Mycoplasma pneumonia.
C139	CWD	Continuous Wave Doppler	Echo technique measuring velocity	CWD detects severe aortic stenosis.
C140	CXR	Chest X-Ray	Basic imaging of thorax	CXR shows pneumonia.
C141	CYA	Cover Your Action	Documentation to ensure accountability	CYA important in medico-legal settings.
C142	CYFRA 21-1	Cytokeratin Fragment Antigen	Tumor marker for lung cancer	CYFRA used in NSCLC monitoring.
C143	CYL	Cylindruria	Presence of casts in urine	CYL seen in nephritis.
C144	CYP	Cytochrome P450	Enzyme system metabolizing drugs	CYP3A4 metabolizes statins.
C145	CYT	Cytology	Study of cells for diagnosis	Pap smear is a cytology test.
C146	CZP	Certolizumab Pegol	Biologic drug for autoimmune disease	CZP used in Crohn’s disease.
C147	CgA	Chromogranin A	Neuroendocrine tumor marker	CgA elevated in carcinoid tumors.
C148	CMRR	Cardiac Magnetic Resonance Relaxation	Imaging property in MRI	CMRR helps tissue characterization.
C149	CMRO₂	Cerebral Metabolic Rate of Oxygen	Oxygen use by the brain	CMRO₂ decreases under anesthesia.
C150	CNSL	Central Nervous System Lymphoma	Rare brain lymphoma	CNSL treated with high-dose methotrexate.
C151	CNTF	Ciliary Neurotrophic Factor	Protein with neuroprotective effects	CNTF studied in ALS therapy.
C152	CNVM	Choroidal Neovascular Membrane	Abnormal blood vessel growth in retina	CNVM seen in wet AMD.
C153	CO₂	Carbon Dioxide	Gas exchanged in respiration	ABG shows CO₂ retention in COPD.
C154	COCP	Combined Oral Contraceptive Pill	Pill containing estrogen + progestin	COCP prevents pregnancy.
C155	COI	Conflict of Interest	Disclosure in medical research	Authors declare COI in studies.
C156	COL	Colonoscopy	Endoscopic examination of colon	COL used to detect colon cancer.
C157	COM	Chronic Otitis Media	Long-term ear infection	COM causes hearing loss.
C158	CON	Consent	Patient’s agreement for procedure	Informed CON required before surgery.
C159	CORADS	COVID-19 Reporting and Data System	Radiological grading of COVID severity	CORADS 5 = high suspicion.
C160	CPAM	Congenital Pulmonary Airway Malformation	Rare lung developmental disorder	CPAM resected in infants.
C161	CPC	Clinical Pathological Conference	Teaching case discussion	CPC held in medical colleges.
C162	CPET	Cardiopulmonary Exercise Testing	Assesses heart-lung reserve	CPET used pre-surgery.
C163	CPI	Checkpoint Inhibitor	Immunotherapy drug class	PD-1 inhibitors are CPI.
C164	CPL	Chronic Pyelonephritis	Long-term kidney infection	CPL causes scarring on imaging.
C165	CPM	Central Pontine Myelinolysis	Demyelination due to rapid Na⁺ correction	CPM causes quadriplegia.
C166	CPN	Common Peroneal Nerve	Leg nerve prone to injury	CPN palsy causes foot drop.
C167	CPQ	Clinical Performance Questionnaire	Tool for assessing trainees	CPQ used in residency evaluations.
C168	CPRS	Clinical Practice Research Datalink	UK medical research database	CPRS used in pharmacoepidemiology.
C169	CPSP	Chronic Post-Surgical Pain	Pain persisting after surgery	CPSP common after thoracotomy.
C170	CPTP	Cytotoxic T-cell Proliferation	Expansion of immune T cells	Measured in immunology labs.
C171	CQI	Continuous Quality Improvement	Systematic healthcare improvement	CQI applied in hospitals.
C172	CRBBB	Complete Right Bundle Branch Block	ECG conduction abnormality	CRBBB seen in pulmonary embolism.
C173	CRCL	Creatinine Clearance	Kidney filtration rate estimate	CRCL calculated by Cockcroft-Gault.
C174	CRD	Chronic Respiratory Disease	Long-standing lung condition	CRD includes COPD and asthma.
C175	CREST	Calcinosis, Raynaud, Esophageal, Sclerodactyly, Telangiectasia	Limited systemic sclerosis	CREST diagnosed in rheumatology.
C176	CRHBP	Corticotropin-Releasing Hormone Binding Protein	Protein regulating CRH	Studied in stress research.
C177	CRLM	Colorectal Liver Metastasis	Liver spread of colorectal cancer	CRLM resected surgically.
C178	CRN	Clinical Research Nurse	Nurse specializing in trials	CRN monitors protocol adherence.
C179	CRPC	Castration-Resistant Prostate Cancer	Advanced stage prostate cancer	CRPC treated with enzalutamide.
C180	CRRT	Continuous Renal Replacement Therapy	Dialysis in critically ill patients	CRRT used in ICU for sepsis.
C181	CSCC	Cutaneous Squamous Cell Carcinoma	Skin cancer type	CSCC treated by excision.
C182	CSDH	Chronic Subdural Hematoma	Blood collection over brain	CSDH drained surgically.
C183	CSI-D	Cognitive Screening Instrument for Dementia	Tool for dementia diagnosis	CSI-D used in community screening.
C184	CSII	Continuous Subcutaneous Insulin Infusion	Insulin pump therapy	CSII used in T1DM management.
C185	CSO	Clinical Support Officer	Non-clinical hospital staff	CSO assists with patient coordination.
C186	CSPH	Clinically Significant Portal Hypertension	Complication of cirrhosis	CSPH diagnosed via HVPG >10 mmHg.
C187	CSRS	Canadian Stroke Registry Study	Database of stroke outcomes	CSRS used in research.
C188	CST	Cortisol Stimulation Test	Evaluates adrenal function	CST used in Addison’s disease.
C189	CSU	Chronic Spontaneous Urticaria	Recurrent hives without trigger	CSU treated with antihistamines.
C190	CSV	Circulating Small Vesicles	Biomarkers in blood	CSV studied in cardiovascular disease.
C191	CTCAE	Common Terminology Criteria for Adverse Events	Standard grading of side effects	CTCAE used in oncology trials.
C192	CTD	Connective Tissue Disease	Autoimmune systemic disorders	CTD includes lupus and scleroderma.
C193	CTGNB	Carbapenem-Resistant Gram-Negative Bacilli	Multi-drug resistant bacteria	CTGNB cause hospital outbreaks.
C194	CTHR	Clinical Trial Hazard Ratio	Risk ratio in research studies	CTHR reported in cancer trials.
C195	CTNMB	Cutaneous T-cell Non-Hodgkin’s Lymphoma	Rare skin lymphoma	CTNMB treated with phototherapy.
C196	CTRCD	Cancer Therapy-Related Cardiac Dysfunction	Heart failure from chemo drugs	CTRCD caused by anthracyclines.
C197	CTSK	Cathepsin K	Enzyme in bone resorption	CTSK inhibitors used in osteoporosis.
C198	CTVS	Cardiothoracic and Vascular Surgery	Medical specialty	CTVS unit handles bypass surgeries.
C199	CUHK	Chinese University of Hong Kong (Medical Faculty)	Academic medical center	CUHK publishes GI research.
C200	CVVH	Continuous Veno-Venous Hemofiltration	Renal replacement therapy in ICU	CVVH used in septic shock with AKI.