Medical Careers - A - C Abbreviation

A & P, A/P

Anterior-Posterior

AAA

Abdominal Aortic Aneurysm,

AAA happens when a weak spot in the main blood vessel (the aorta) in your belly stretches or balloons outward.

AAOx3

Awake, alert, and oriented to times three (person, place, and time). It is a clinical shorthand used in medical documentation to describe a patient's mental status and cognitive awareness during an exam

AAOx4

Stands for awake, alert, and oriented times four (person, time, place, situation)

Abd

Abdomen or Abdominal

Abx

Antibiotics

ABG

An arterial blood gas (ABG) test is a blood test that requires a sample from an artery in your body to measure the levels of oxygen and carbon dioxide in your blood. The test also checks the balance of acids and bases, known as the pH balance, in your blood.

ac

Before Meals

ACLS

Advanced Cardiac Life Support (or Advanced Cardiovascular Life Support), which is a set of clinical guidelines and life-saving protocols used to treat life-threatening medical emergencies like cardiac arrest, stroke, and severe heart rhythms.

ACS

Acute Coronary Syndrome, Is an umbrella term for conditions caused by a sudden reduction or blockage of blood flow to the heart,

AD

Right Ear

ad lib

as desired, at one’s pleasure, or as much as one wants

ADL

Activities of daily living

AED

Automated external defibrillator, a portable electronic device used during sudden cardiac arrest

adm

Admission/Admit

A-fib

atrial fibrillation, which is a common type of irregular and often rapid heart rhythm

AICD

Automatic Implantable Cardioverter-Defibrillator. It's more commonly called an ICD (Implantable Cardioverter-Defibrillator) today.

It's a small battery-powered device implanted under the skin of the chest (usually near the collarbone), with leads running into the heart. It continuously monitors heart rhythm and delivers treatment when it detects a dangerous arrhythmia

AIDET

AIDET is a patient communication framework (not a clinical protocol like the previous terms) developed by Studer Group, now part of Huron Consulting. It's widely used in hospitals to improve patient experience, reduce anxiety, and build trust.

The letters stand for:

Acknowledge: Greet the patient (and family) warmly, make eye contact, and use their preferred name.

Introduce: Say who you are, your role, and your experience or training.

Duration: Explain how long a test, procedure, or wait will take.

Explanation: Describe what will happen, why it's being done, and what to expect, in plain language. Ask if they have questions.

Thank you: Thank the patient for their time, trust, and for choosing your facility.

AIDS

Acquired Immunodeficiency Syndrome. It's the advanced stage of infection with HIV (Human Immunodeficiency Virus).

• Acquired: You catch or get the condition during your life, rather than being born with it.

• Immunodeficiency: Your immune system is weak and cannot fight off infections.

• Syndrome: A group of health problems and illnesses that happen together

AKA

Above the Knee Amputation

amb

ambulate or ambulatory, meaning a patient is able to walk or move around

AP

The apical pulse is your heartbeat heard by placing a stethoscope directly over the tip (apex) of the heart, on the left side of the chest, just below the breast (5th intercostal space, midclavicular line)

AS

Left Ear

AU

Both Ears

AMA

Against Medical Advice

ASA

most commonly stands for Acetylsalicylic Acid, which is aspirin.

Uses:

• Pain, fever, and inflammation relief (at higher doses)

• Antiplatelet effect at low doses (typically 81 mg), used to prevent blood clots

• Acute coronary syndrome / suspected heart attack: a chewed dose (usually 162-325 mg) is given early, tying back to your earlier terms ACS and ACLS

ASCVD

Arteriosclerotic cardiovascular disease, clogged artery:
• It is a group of heart and blood vessel conditions caused by fatty plaque buildup inside the arteries.

• This buildup narrows and stiffens the arteries, which slows or blocks normal blood flow.

• It is a major cause of heart attacks and strokes worldwide

Ax

axillary or axilla (armpit)

BBP

Bloodborne pathogen: In healthcare and workplace safety settings, BBP refers to pathogenic microorganisms present in human blood or other potentially infectious materials (OPIM) that can cause disease in humans. [1]

• Common Examples: Hepatitis B virus (HBV), Hepatitis C virus (HCV), and Human Immunodeficiency Virus (HIV).

BC x 2

Means two sets of blood cultures.

What It Means

• BC: Stands for blood cultures, a lab test that checks blood for bacteria or fungi.

• x 2: Means the test is ordered or collected two times (two separate sets).

BE

barium enema, an X-ray exam of the large intestine.

BEFAST

Things to check for a stroke victim, Balance, Eyes, Face, Arms, Speech, and Time.

Bid

Twice a Day (medication)

BiPAP/BPAP

It's a breathing machine that delivers air through a mask at two pressures: a higher pressure when you breathe in (IPAP) and a lower pressure when you breathe out (EPAP). This helps you take deeper breaths, keeps the airways open, and clears carbon dioxide, without needing a breathing tube. It's commonly used for COPD flare-ups, heart failure with fluid in the lungs, and sleep apnea.

BKA

Below-Knee Amputation

BLS

Basic Life Support

It's the foundational emergency care for cardiac arrest, choking, and breathing emergencies, used until advanced help arrives. It includes high-quality chest compressions, rescue breaths, use of an AED (automated external defibrillator), and relief of airway obstruction

BM

Bowel Movement

It's the passing of stool. In charting, nurses document the frequency, amount, color, and consistency (often using the Bristol Stool Scale), and note any abnormalities such as blood, black tarry stool (melena), diarrhea, or constipation.

BMI

Body Mass Index

It's a screening number that estimates body fatness from height and weight: weight (kg) ÷ height (m)².

BMP

Basic Metabolic Panel

It's a common blood test that checks kidney function, blood sugar, electrolytes, and acid-base balance. It includes 8 values:

• Glucose: blood sugar

• BUN (blood urea nitrogen) and creatinine: kidney function

• Sodium, potassium, chloride: electrolytes

• CO2 (bicarbonate): acid-base balance

• Calcium: bone, nerve, and muscle function

BP

Blood Pressure

It's the force of blood pushing against artery walls, recorded as two numbers: systolic (pressure when the heart contracts) over diastolic (pressure when the heart relaxes), measured in mmHg.

Adult categories (ACC/AHA):

• Normal: below 120/80

• Elevated: 120-129 / below 80

• Stage 1 hypertension: 130-139 / 80-89

• Stage 2 hypertension: 140 or higher / 90 or higher

• Hypertensive crisis: above 180/120

bpm

Beats Per Minute

It's the unit used to measure heart rate, or how many times the heart beats in one minute.

Normal adult resting range: 60-100 bpm

• Below 60: bradycardia

• Above 100: tachycardia

BR

Bed Rest

It's an activity order that limits a patient to staying in bed, either completely or with limited privileges (such as bathroom privileges, written as BRP). It's used after certain surgeries or procedures, during acute illness, or for conditions like preeclampsia or injury.

BRP

Bathroom Privileges

It's an activity order that lets a patient get out of bed only to use the bathroom or bedside commode, while otherwise staying on bed rest.

BS

Blood Sugar

It's the amount of glucose in the blood, usually checked with a fingerstick glucometer or lab draw. In nursing, it's commonly charted before meals and at bedtime for patients with diabetes.

Typical ranges (adults):

• Fasting normal: 70-99 mg/dL

• Hypoglycemia: below 70 mg/dL

• Diabetes (fasting): 126 mg/dL or higher

BUN

Blood Urea Nitrogen

It's a blood test that measures the amount of nitrogen from urea, a waste product made when the liver breaks down protein. The kidneys filter urea out of the blood, so BUN is mainly used to assess kidney function. It's part of the BMP.

bx

Biopsy

It's the removal of a small sample of tissue or cells to be examined under a microscope, usually to diagnose or rule out conditions like cancer, infection, or inflammation.

bil,b/l

Bilateral

It means both sides of the body

BVM

Bag-Valve-Mask

It's a handheld device with a self-inflating bag, a one-way valve, and a face mask, used to deliver positive-pressure breaths to a patient who isn't breathing or is breathing inadequately.

Ca

Calcium

It's the chemical symbol for calcium, a mineral essential for bone and teeth strength, muscle contraction, nerve signaling, blood clotting, and heart function. Type of Electrolyte

CA

Cancer (or Carcinoma)

It's shorthand for a malignant growth of abnormal cells that can invade nearby tissue and spread to other parts of the body. It's often paired with the body site, as in "breast CA," "lung CA," or "CA prostate."

CABG

Coronary Artery Bypass Graft (pronounced "cabbage")

It's open-heart surgery that restores blood flow to the heart muscle by creating new routes around blocked coronary arteries. A surgeon takes a healthy blood vessel from elsewhere in the body, such as the internal mammary artery (chest), saphenous vein (leg), or radial artery (arm), and attaches it above and below the blockage.Bypasses a blockage in the heart

CAD

Coronary Artery Disease

It's the narrowing or blockage of the arteries that supply blood to the heart muscle, usually from atherosclerotic plaque buildup (the most common form of ASCVD). Reduced blood flow can cause angina (chest pain), shortness of breath, heart attack (ACS), or heart failure.

CAP

Community-Acquired Pneumonia

It's a lung infection picked up outside of a hospital or healthcare facility. It's most often caused by Streptococcus pneumoniae, with other causes including atypical bacteria (such as Mycoplasma) and viruses.

Typical symptoms: cough (often with sputum), fever, chills, shortness of breath, pleuritic chest pain, and fatigue.

CAUTI

Catheter-Associated Urinary Tract Infection (pronounced "cow-tee")

It's a urinary tract infection that develops in a patient who has had an indwelling urinary (Foley) catheter in place for more than 2 days. It's one of the most common hospital-acquired infections and is tracked as a patient safety quality measure.

CBC

Complete Blood Count

It's a common blood test that measures the cells in your blood, used to screen for infection, anemia, bleeding, and many other conditions.

Main components:

• WBC (white blood cells): fight infection

• RBC (red blood cells): carry oxygen

• Hgb (hemoglobin) and Hct (hematocrit): oxygen-carrying capacity and the percentage of blood made up of red cells

• Platelets (Plt): help blood clot

• Indices such as MCV, which describes red cell size

CBC w/ diff

Complete Blood Count with Differential

It's a CBC plus a breakdown of the five types of white blood cells, showing both the percentage and absolute count of each. This helps pinpoint what kind of problem is affecting the immune system.

The five WBC types:

• Neutrophils: first responders to bacterial infection (high in infection, low in neutropenia)

• Lymphocytes: fight viral infections and make antibodies (high in viral infections and some leukemias)

• Monocytes: clean up debris and become macrophages (high in chronic infection or inflammation)

• Eosinophils: respond to allergies and parasites

• Basophils: involved in allergic reactions and inflammation

CBR

Complete Bed Rest

It's a strict activity order meaning the patient must stay in bed with no getting up, not even for bathroom privileges (a bedside commode or bedpan is used instead)

cc,CC

Chief Complaint

It's the main reason the patient seeks care, recorded in the patient's own words when possible (e.g., "CC: chest pain x 2 hours"). It's the starting point of the history and helps guide the rest of the assessment.

Other meanings:

• Cubic centimeter (cc): a unit of volume equal to 1 mL. It's on the Joint Commission's "Do Not Use" list because it can be mistaken for "U" (units), so mL is preferred.

CCU

Coronary Care Unit (also Cardiac Care Unit)

It's a specialized hospital unit for patients with serious heart conditions, such as acute coronary syndrome (heart attack), unstable arrhythmias, acute heart failure, or recovery after cardiac procedures. Patients receive continuous cardiac monitoring and have a low nurse-to-patient ratio, typically 1:1 or 1:2.

Other meaning: Critical Care Unit, used in some hospitals as another name for the ICU.

CDC

Centers for Disease Control and Prevention

It's the U.S. national public health agency, based in Atlanta, Georgia, and part of the Department of Health and Human Services. It tracks and responds to disease outbreaks, publishes health guidelines (such as vaccine schedules and infection control standards), and conducts research on disease prevention.

CDI, C-Diff

CDI = Clostridioides difficile Infection (also called C. diff)

It's a bacterial infection of the colon, usually happening after antibiotics kill off the normal healthy gut bacteria and let C. diff overgrow. It causes watery diarrhea, belly pain, and fever, and it spreads easily through spores, so it requires contact precautions (gown and gloves) and soap-and-water hand washing in healthcare settings.

CEU

Continuing Education Unit

It's a credit that measures participation in professional education after initial licensure or certification. Nurses and other healthcare professionals earn CEUs through courses, conferences, workshops, and online training to keep their licenses and certifications current (for example, ACLS and BLS renewals or state nursing license renewals). One CEU typically equals 10 contact hours, though many nursing boards count contact hours directly instead.

CHF

Congestive Heart Failure

It's a condition in which the heart can't pump blood effectively enough to meet the body's needs, so fluid backs up into the lungs, legs, and abdomen. Many providers now just say heart failure (HF).

CLABSI

Central Line-Associated Bloodstream Infection (pronounced "clab-see")

It's a serious bloodstream infection that develops in a patient who has had a central venous catheter (central line) in place for more than 2 days, when the infection isn't related to another site. It's a tracked hospital quality and patient safety measure, like CAUTI.

Signs and symptoms: fever, chills, low blood pressure, and redness, swelling, tenderness, or drainage at the insertion site. Diagnosis is based on positive blood cultures.

cl liq

clear liquid (diet). Only liquids you can see through, like water, broth, apple juice, tea, and gelatin.

CMP

Comprehensive Metabolic Panel. A blood test that checks kidney function, liver function, blood sugar, electrolytes, and fluid balance. plus 6 more tests for liver function and protein levels.

CNA

Certified Nursing Assistant. A healthcare worker who helps patients with daily care like bathing, eating, and moving, and who takes vital signs under a nurse's supervision.

CNS

Central Nervous System. The brain and spinal cord, which control the body's functions and processing of information.

c/o

complains of (or complaining of). Used in charting to note what symptom the patient reports, like "c/o headache."

COPD

Chronic Obstructive Pulmonary Disease. A long-term lung condition that makes it hard to breathe, most often caused by smoking. It includes emphysema and chronic bronchitis.

COVID-19

Coronavirus Disease 2019. A contagious respiratory illness caused by the SARS-CoV-2 virus, with symptoms like fever, cough, and shortness of breath.

CP

Chest Pain. Discomfort or pain in the chest area, which can come from the heart, lungs, muscles, or digestive system.

CPAP

Continuous Positive Airway Pressure. A machine that blows steady air through a mask to keep the airway open, commonly used for sleep apnea.

CPR

Cardiopulmonary Resuscitation. An emergency procedure using chest compressions (and often rescue breaths) to keep blood and oxygen flowing when someone's heart or breathing has stopped.

CRP

C-Reactive Protein. A protein the liver makes when there is inflammation in the body. A blood test for it helps detect infection or inflammation.

C&S

Culture and Sensitivity. A lab test that grows a sample (like urine, blood, or a wound swab) to identify any bacteria present (culture) and shows which antibiotics will work against them (sensitivity).

CSF

Cerebrospinal Fluid. The clear fluid that surrounds and cushions the brain and spinal cord.

CT

Computed Tomography. An imaging scan that uses X-rays and a computer to create detailed cross-sectional pictures of the body. Also called a CAT scan.

CTS

Carpal Tunnel Syndrome. A condition where pressure on a nerve in the wrist causes numbness, tingling, and weakness in the hand and fingers.

CVA

Cerebrovascular Accident. Another term for a stroke, when blood flow to part of the brain is blocked or a blood vessel bursts.

CXR

Chest X-Ray. An imaging test that takes a picture of the lungs, heart, and chest bones.

CVC

Central Venous Catheter. A long IV line placed into a large vein (usually in the neck, chest, or groin) to give medications, fluids, or blood, or to draw blood. Also called a central line.

CRNP

Certified Registered Nurse Practitioner. An advanced practice nurse who can diagnose conditions, order tests, and prescribe medications.