A&O | Alert and oriented |
A&P | Auscultation and percussion; anterior and posterior; assessment and plan |
A&W | Alive and well |
A1C | Hemoglobin A1C |
aa | Of each (ana) |
AA | Aplastic anemia; Alcoholics Anonymous |
AAA | Abdominal aortic aneurysm |
AAL | Anterior axillary line |
AAO | Awake, alert, and oriented |
AAP | American Academy of Pediatrics |
ABC | Absolute band count; absolute basophil count; aspiration, biopsy, and cytology; artificial β-cells |
Abd | Abdomen |
ABG | Arterial blood gases |
ABI | Ankle brachial index |
ABP | Arterial blood pressure |
ABW | Actual body weight |
ABx | Antibiotics |
AC | Before meals (ante cibos) |
ACC | American College of Cardiology |
ACE | Angiotensin-converting enzyme |
ACEI | Angiotensin-converting enzyme inhibitor |
ACG | American College of Gastroenterology |
ACL | Anterior cruciate ligament |
ACLS | Advanced cardiac life support |
ACR | Albumin:creatinine ratio; American College of Rheumatology |
ACS | Acute coronary syndrome |
ACT | Activated clotting time |
ACTH | Adrenocorticotropic hormone |
AD | Alzheimer disease, right ear (auris dextra) |
ADA | American Diabetes Association; adenosine deaminase |
ADE | Adverse drug effect (or event) |
ADH | Antidiuretic hormone |
ADHD | Attention-deficit hyperactivity disorder |
ADL | Activities of daily living |
ADR | Adverse drug reaction |
AED | Antiepileptic drug(s) |
AF | Atrial fibrillation |
AFB | Acid-fast bacillus; aortofemoral bypass; aspirated foreign body |
Afeb | Afebrile |
AFP | α-Fetoprotein |
A/G | Albumin–globulin ratio |
AGA | American Gastroenterological Association |
AGE | Acute viral gastroenteritis |
AHA | American Heart Association |
AI | Aortic insufficiency |
AIDS | Acquired immunodeficiency syndrome |
AKA | Above-knee amputation; alcoholic ketoacidosis; all known allergies; also known as |
AKI | Acute kidney injury |
ALD | Alcoholic liver disease |
ALFT | Abnormal liver function test |
ALK | Anaplastic lymphoma kinase |
ALL | Acute lymphocytic leukemia; acute lymphoblastic leukemia |
ALP | Alkaline phosphatase |
ALS | Amyotrophic lateral sclerosis |
ALT | Alanine aminotransferase |
AMA | Against medical advice; American Medical Association; antimitochondrial antibody |
AMI | Acute myocardial infarction |
AML | Acute myelogenous leukemia |
Amp | Ampule |
AMPA | α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid |
ANA | Antinuclear antibody |
ANC | Absolute neutrophil count |
ANLL | Acute nonlymphocytic leukemia |
Anti-CCP | Anticyclic citrullinated peptide |
AODM | Adult-onset diabetes mellitus |
A&O × 3 | Awake and oriented to person, place, and time |
A&O × 4 | Awake and oriented to person, place, time, and situation |
AOM | Acute otitis media |
AP | Anteroposterior |
APACHE | Acute Physiology and Chronic Health Evaluation |
APAP | Acetaminophen (N-acetyl-p-aminophenol) |
aPTT | Activated partial thromboplastin time |
ARB | Angiotensin receptor blocker |
ARC | AIDS-related complex |
ARDS | Adult respiratory distress syndrome |
ARF | Acute renal failure; acute respiratory failure; acute rheumatic fever |
AROM | Active range of motion |
AS | Left ear (auris sinistra) |
ASA | Aspirin (acetylsalicylic acid) |
ASCVD | Atherosclerotic cardiovascular disease |
ASD | Atrial septal defect |
ASH | Asymmetric septal hypertrophy |
ASHD | Arteriosclerotic heart disease |
AST | Aspartate aminotransferase |
ATG | Antithymocyte globulin |
ATN | Acute tubular necrosis |
AU | Each ear (auris uterque) |
AV | ...