| Topics![[file]](images/file.gif) a-Fetoprotein (AFP), in amniotic fluid 
![[expand]](images/index_expand.gif) a2-Antiplasmin- Abacavir
- Abatacept
- Abciximab
- Abdomen
- Abdominal aortic aneursym
- Abdominal reflex
- Abdominojugular reflux
- Abducens nerve (6th cranial nerve)
- Abetalipoproteinemia
- ABL-BCR gene
- ABO blood group
- Abortion
- Abortus
- Abrasions
- Abruptio placentae
- Abscess
- Absidia infection
- Absorption
- Absorption rate constant, of drugs
- Abstinence, periodic
- Abulia
- Abuse
- Acacitidine
- Acamprosate
- Acanthamoeba infection
- Acanthocytes
- Acanthosis nigricans
- Acarbose
- Accessory pathway reentrant tachycardia
- Acclimatization
- ACE inhibitors (see Angiotensin-converting enzyme (ACE) inhibitors)
- Acebutolol
- Acephate poisoning
- Aceruloplasminemia
- Acetaldehyde
- Acetaminophen
- Acetanilid poisoning
- Acetazolamide
- Acetic acid poisoning
- Acetoacetic acid
- Acetohexamide
- Acetone poisoning
- Acetonitrile poisoning
- Acetophenetidin poisoning
- Acetylcholine
- Acetylcholine receptor antibodies
- Acetylcholinesterase, in amniotic fluid
- Acetylcysteine
- Acetylene gas poisoning
- Acetylsalicylic acid (see Aspirin)
- Achalasia
- Achilles tendon
- Achlorhydria
- Achondroplasia
- Acid
- Acid hemolysis test (Ham's test)
- Acid phosphatase
- Acid steatocrit
- Acid-base disorders
- Acid-fast stains
- Acidemia
- Acidosis
- Aciduria
- Acinetobacter infection
- Acinic cell carcinoma
- Acitretin
- Acne
- Acne conglobata
- Acne fulminans
- Acne rosacea
- Acneiform eruptions
- Acoustic nerve (see Cranial nerves, 8th (auditory, vestibulocochlear))
- Acoustic neuroma
- Acoustic reflex
- Acoustic trauma
- Acquired immunodeficiency syndrome (AIDS) (see Human immunodeficiency virus (HIV) infection)
- Acridine orange stain
- Acrivastine
- Acrochordons
- Acrocyanosis
- Acrodermatitis chronica atrophicans
- Acrodermatitis continua of Hallopeau
- Acrodermatitis enteropathica
- Acromegaly
- Acromioclavicular joint sprain
- Acrophobia
- ACTH (see Adrenocorticotropic hormone)
- ACTHoma
- Actin, antibody to
- Acting out
- Actinic atrophy, of lips
- Actinic keratoses
- Actinic prurigo
- Actinomycin, in pregnancy
- Actinomycosis
- Action potential
- Activated charcoal
- Activated protein C
- Activities of daily living
- ACTN4 gene
- Acupuncture
- Acute abdomen
- Acute bacterial endocarditis
- Acute chest syndrome
- Acute coronary syndromes
- Acute febrile respiratory disease
- Acute hypoxemic respiratory failure (AHRF)
- Acute interstitial pneumonia
- Acute lung injury (ALI)
- Acute mountain sickness
- Acute necrotizing ulcerative gingivitis
- Acute phase reactants
- Acute radiation syndromes
- Acute respiratory distress syndrome (ARDS)
- Acute retroviral syndrome
- Acute stress disorder
- Acute tubular necrosis
- Acute urethral syndrome
- Acyclovir
- Adalimumab
- Adam (methylenedioxymethamphetamine)
- ADAM33 gene
- ADAMTS13
- Adapalene
- Addiction
- Addison's disease
- Adefovir
- Adenine phosphoribosyltransferase deficiency
- Adenitis, Yersinia
- Adenocarcinoma
- Adenoid cystic carcinoma
- Adenoidectomy
- Adenoids
- Adenolymphangitis
- Adenoma
- Adenomatosis
- Adenomatous polyposis, familial
- Adenosine
- Adenosine deaminase (ADA)
- Adenosine diphosphate (ADP), platelet deficiency of
- Adenovirus infection
- Adenylosuccinase deficiency
- ADH (see Antidiuretic hormone)
- Adhesins
- Adhesives, tissue
- Adie's pupil
- Adipose tissue, in diabetes mellitus
- Adjustment sleep disorder
- Adnexa (see Fallopian tubes; Ovary(ies))
- Adolescents
- Adrenal crisis
- Adrenal gland
- Adrenal insufficiency
- Adrenal virilism
- Adrenalectomy
- Adrenarche
- Adrenocorticotropic hormone (ACTH)
- Adrenogenital syndrome
- Adrenoleukodystrophy
- Adrenomyeloneuropathy
- Adult chlamydial conjunctivitis
- Adult respiratory distress syndrome (see Acute respiratory distress syndrome)
- Adult T-cell leukemia-lymphoma
- Advance directive
- Advanced sleep phase syndrome
- Adverse drug reactions
- Adynamic ileus
- Aeromonas infection
- Aerophagia
- Aerotitis media
- Affective disorders
- African sleeping sickness
- African tick bite fever
- African tick typhus
- Agammaglobulinemia
- Age-related macular degeneration
- Ageometria
- Ageusia
- Agglutination tests
- Aggression
- Aging
- Agitation
- Agnogenic myeloid metaplasia
- Agnosia
- Agonist drug
- Agoraphobia
- Agouti-related peptide
- Agranulocytosis
- Agraphia
- AIDS (see Human immunodeficiency virus (HIV) infection)
- Air
- Air embolism
- Air enema, in intussusception
- Air leak
- Air mattress
- Air pollution-related illness
- Air travel
- Air-leak syndromes
- Airway
- Airway (artificial)
- Akathisia
- Akinesia
- Alagille syndrome
- Alanine aminotransferase (ALT)
- Albendazole
- Albers-Schonberg disease
- Alberts disease
- Albinism
- Albright's hereditary osteodystrophy
- Albright's syndrome
- Albumin
- Albumin\creatinine ratio
- Albuterol
- Alcohol
- Alcohol abuse
- Alcohol dehydrogenase
- Alcoholic ketoacidosis
- Alcoholics Anonymous (AA)
- Alcoholism (see Alcohol abuse)
- Aldehyde dehydrogenase-2 deficiency
- Aldicarb poisoning
- Aldolase B deficiency
- Aldosterone
- Aldosterone receptor blockers
- Aldosteronism
- Aldrin poisoning
- Alefacept
- Alemtuzumab
- Alendronate
- Aleppo boil
- Alexia
- Alfuzosin
- Alginates
- Alimentary tract (see Gastrointestinal tract)
- Aliskiren
- Alkalemia
- Alkali
- Alkali sulfide poisoning
- Alkaline diuresis
- Alkaline phosphatase
- Alkalosis
- Alkaptonuria
- Alkylating agents
- Allen's test
- Allergens
- Allergic alveolitis
- Allergic angiitis (Churg-Strauss syndrome)
- Allergic bronchopulmonary aspergillosis
- Allergic rhinitis
- Allergy
- Alligator bite
- Allodynia
- Allograft
- Allopurinol
- Almond oil poisoning
- Almotriptan
- Aloe spp poisoning
- Alopecia
- Alopecia areata
- Alpha-Adrenergic agonists
- Alpha-adrenergic agonists
- Alpha-adrenergic blocking agents
- Alpha-chain disease
- Alpha-Fetoprotein (AFP)
- Alpha-fetoprotein (see Alpha-Fetoprotein)
- Alpha-Galactosidase A deficiency
- Alpha-Glucosidase inhibitors
- Alpha1-acid glycoprotein
- Alpha1-Antitrypsin deficiency
- Alpha2-Antiplasmin, deficiency of
- Alphaprodine poisoning
- Alphavirus infection
- Alport's syndrome
- Alprazolam
- Alprostadil
- ALS (amyotrophic lateral sclerosis)
- ALTE (apparent life-threatening event)
- Alteplase
- Altered sleep phase syndromes
- Alternative medicine
- Altitude sickness
- Altitudinal field defect
- Aluminum
- Aluminum acetate
- Aluminum chloride
- Aluminum hydroxide
- Aluminum sulfate and calcium acetate
- Alveolar hemorrhage
- Alveolar proteinosis
- Alveolar ridge
- Alveolar-arterial (A-a) O2 gradient
- Alveolitis
- Alzheimer's disease
- Alzheimers disease
- Amanita poisoning
- Amantadine
- Amaurosis fugax
- Amblyopia (see Blindness)
- Ambrisentan
- Ambulation
- Amebiasis
- Ameloblastoma
- Amelogenesis imperfecta
- Amenorrhea
- American Sign Language
- Amifostine
- Amikacin
- Amiloride
- Amines, cancer and
- Amino acids
- Aminoglycosides
- Aminophylline
- Aminosalicylic acid, during breastfeeding
- Aminotransferases
- Amiodarone
- Amitriptyline
- Amlodipine
- Ammonia
- Ammonium fluoride poisoning
- Amnesia
- Amnestic mild cognitive impairment
- Amniocentesis
- Amnionitis
- Amniotic fluid
- Amniotic membrane
- Amniotic sac
- Amniotomy
- Amorolfine
- Amoxapine
- Amoxicillin
- Amoxicillin-clavulanate
- Amphetamines
- Amphotericin B
- Ampicillin
- Ampicillin-sulbactam
- AMPLE history
- Amprenavir
- Ampulla of Vater
- Amputation
- Amputation neuroma
- Amrinone
- Amsler grid
- Amusia
- Amyl nitrite
- Amylase
- Amylin analogs
- Amyloid P component
- Amyloidosis
- Amyotrophic lateral sclerosis
- Amyotrophy, diabetic
- Anabolic steroids
- Anaerobic bacterial infection
- Anagen effluvium
- Anagrelide
- Anakinra
- Anal canal
- Anal sphincters
- Analgesia
- Anaphylactoid reactions
- Anaphylaxis
- Anaplastic large cell lymphoma
- Anarithmia
- Anasarca
- Anastrozole
- Ancylostoma infestation
- Andes virus infection
- Androgen insensitivity syndrome
- Androgen receptor blockers
- Androgens
- Anemia
- Anencephaly
- Anesthesia anesthetics, porphyria and
- Anesthesia/anesthetics
- Aneurysm
- Aneurysmal bone cyst
- Angel dust (PCP, phencyclidine)
- Angelman's syndrome
- Angiitis, allergic (Churg-Strauss syndrome)
- Angina decubitus
- Angina pectoris
- Angiodysplasia
- Angioedema
- Angiofibroma, penile
- Angiogenesis
- Angiography
- Angiokeratoma corporis diffusum
- Angioma
- Angiomatosis, bacillary
- Angiomyolipoma
- Angioneurotic edema (see Angioedema)
- Angioplasty
- Angiosarcoma
- Angiostrongyliasis
- Angiotensin
- Angiotensin II
- Angiotensin II receptor blockers
- Angiotensin-converting enzyme (ACE) inhibitors
- Angiotension-converting enzyme (ACE) inhibitors, in diabetes mellitus
- Angular cheilitis
- Anhedonia
- Anhidrosis
- Anidulafungin
- Aniline dye poisoning
- Animals
- Anion gap
- Anisakiasis
- Aniseikonia
- Anisocoria
- Anisocytosis
- Anisometropia
- Anistreplase (anisolylated plasminogen activator)
- Ankle
- Ankle jerk reflex
- Ankle-brachial index
- Ankyloglossia
- Ankylosing spondylitis
- Ankylosis, temporomandibular joint
- Annular pancreas
- Annuloaortic ectasia
- Annuloplasty, in tricuspid regurgitation
- Anogenital warts
- Anomalies (see Congenital anomalies; Congenital heart disease)
- Anomia
- Anonychia
- Anorchia
- Anorectum (see Anus; Rectum)
- Anorexia
- Anorexia nervosa
- Anorexia tardive
- Anorexics, in elderly
- Anorgasmia
- Anoscopy
- Anosmia
- Anosognosia
- Anovulation
- Antacids
- Antagonist drug
- Antegonial notching
- Anterior chamber hemorrhage
- Anterior cord syndrome
- Anterior cruciate ligament injury
- Anterior drawer test
- Anthracosis
- Anthracyclines
- Anthralin
- Anthraquinones
- Anthrax
- Anti-glomerular basement membrane antibody disease
- Anti-Ro antibodies
- Antiandrogens
- Antiangiogenesis drugs
- Antianxiety drugs (see Anxiolytics)
- Antiarrhythmics
- Antibiotics
- Antibodies
- Anticholinergic drugs
- Anticholinesterase test
- Anticholinesterases
- Anticoagulants
- Anticonvulsants
- Anticytokines
- Antideoxyribonuclease test
- Antidepressants
- Antidiarrheals
- Antidiuretic hormone (ADH)
- Antidiuretic hormone (ADH) blockers
- Antidotes
- Antiemetics
- Antifibrinolytics
- Antifreeze poisoning
- Antifungals
- Antigen(s)
- Antigen-presenting cells
- Antiglobulin test
- Antigravity suit
- Antihemophilic globulin (see Coagulation factors, factor VIII)
- Antihistamines
- Antihyaluronidase test
- Antihyperglycemics
- Antihypertensives
- Antilymphocyte globulin
- Antilymphocyte serum
- Antimalarials
- Antimetabolites
- Antimicrobials (see Antibiotics, and specific drugs)
- Antimitochondrial antibodies
- Antimony poisoning
- Antineoplastic drugs (see Cancer chemotherapy)
- Antineutrophil cytoplasmic antibodies
- Antinuclear antibodies
- Antiphospholipid antibodies
- Antiphospholipid syndrome
- Antiplatelet drugs
- Antipruritics
- Antipsychotics
- Antiretrovirals
- Antisense technology
- Antiseptics
- Antisocial personality disorder
- Antispasmodics, in elderly
- Antistreptolysin O
- Antisynthetase antibodies
- Antithrombin
- Antithrombotics
- Antithymocyte globulin
- Antitoxin
- Antitussives
- Antivenom
- Antivirals
- Anton's syndrome
- Antrectomy
- Anuria
- Anus
- Anxiety
- Anxiolytics
- Aorta
- Aortic arch syndrome
- Aortic arch, congenital abnormality of
- Aortic valve
- Aorticopulmonary window murmurs
- Aortitis
- Aortography
- APACHE II score
- Apatite crystal deposition disease
- APC gene
- Apgar score
- Aphasia
- Apheresis, of low-density lipoproteins
- Aphthae (see Ulcer(s), oral)
- Aplastic anemia
- Apley scratch test
- Apley test
- Apnea
- Apnea test
- Apnea-hypopnea index
- Apo E proteins
- Apocrine glands
- Apomorphine
- Apoplexy
- Apoproteins
- Apoptosis
- Apparent life-threatening event (ALTE)
- Appendix
- Appetite
- Apraclonidine
- Apraxia
- Aprepitant
- Aprotinin
- Aqueous humor
- Arachnodactyly
- Arboviruses
- ARDS (see Acute respiratory distress syndrome)
- Arenavirus infection
- Arformoterol
- Argatroban
- Argentinian hemorrhagic fever
- Arginase deficiency
- Arginine
- Arginine infusion test
- Arginine vasopressin (see Antidiuretic hormone)
- Argininemia
- Argininosuccinate lyase deficiency
- Argininosuccinate synthetase deficiency
- Argon laser trabeculoplasty (ALT)
- Argyll Robertson pupil
- Argyria
- Aripiprazole
- Arm
- Aromatase inhibitors
- Aromatic oils
- Arousal index
- Arousal, persistent
- Arrhythmias
- Arsenic compounds
- Arsine gas poisoning
- Artemether
- Arterial catheterization (see Catheterization)
- Arterial gas embolism
- Arterial switch operation
- Arteriography (see Angiography)
- Arteriolar nephrosclerosis
- Arteriolitis, necrotizing
- Arteriolosclerosis, hypertension and
- Arteriosclerosis
- Arteriovenous fistula
- Arteriovenous malformation
- Arteriovenous nicking
- Arteritis
- Artery (see specific arteries)
- Artesunate
- Arthralgia
- Arthritis
- Arthritis mutilans
- Arthritis-dermatitis syndrome
- Arthro-onychodysplasia
- Arthrocentesis
- Arthrogryposis multiplex congenita
- Arthropathy
- Arthroplasty
- Artificial respiration (see Ventilation)
- Arylsulfatase A deficiency
- Arytenoidectomy
- Asacol
- Asbestosis
- Asboe-Hansen sign
- Ascariasis
- Ascending arousal system
- Aschoff bodies
- Ascites
- Ascorbic acid (see Vitamin C)
- Aseptic meningitis
- Aseptic necrosis
- Ashman phenomenon
- Askin's tumor
- Asociality
- Asp stings
- Asparaginase
- Aspartame, during pregnancy
- Aspartate
- Aspartate transaminase (Ast)
- Asperger's syndrome
- Aspergilloma
- Aspergillosis
- Aspergillus niger infection
- Asphyxia
- Aspiration
- Aspiration (diagnostic)
- Aspirin
- Asplenia
- Assist-control ventilation
- Assisted reproduction techniques
- Assisted suicide
- Assistive devices
- AST (see Aspartate transaminase)
- Astereognosis
- Asterixis
- Asthma
- Astigmatic keratotomy
- Astigmatism
- Astraphobia
- Astringents
- Astrocytoma
- Astrovirus infection
- Astrovirus infections
- Asymptomatic bacteriuria
- Asystole
- Ataxia
- Ataxia-telangiectasia
- Ataxia/myokymia
- Atazanavir
- Atelectasis
- Atenolol
- Atheroma
- Atherosclerosis
- Athetosis
- Athlete
- Athlete's foot
- Athletic heart syndrome
- Atlantoaxial subluxation
- Atlas, disorders of
- Atmospheric pressure
- Atomic weight
- Atomoxetine
- Atopic dermatitis
- Atopic disorders
- Atorvastatin
- Atovaquone
- Atovaquone-proguanil
- ATP-binding cassette transporter A1
- Atransferrinemia
- Atresia
- Atrial ectopic beats
- Atrial escape beats
- Atrial fibrillation
- Atrial flutter
- Atrial hypertrophy
- Atrial natriuretic peptide
- Atrial premature beats
- Atrial septal defect
- Atrial septostomy (Rashkind's procedure)
- Atrial tachycardia
- Atrioventricular block
- Atrioventricular dissociation
- Atrioventricular nodal reentrant tachycardia
- Atrioventricular nodal reentrant tachycardial
- Atrioventricular node
- Atrioventricular septal defect
- Atrophy
- Atropine
- Attention-deficit/hyperactivity disorder
- Audiometry
- Auditory brain stem response
- Auditory nerve (see Cranial nerves, 8th (auditory, vestibulocochlear))
- Aura
- Auramine O stain
- Auramine-rhodamine stain
- Auscultation
- Auspitz sign
- Austin Flint murmur
- Autism
- Autoantibodies
- Autoantigens
- Autoerythrocyte sensitization
- Autograft
- Autohemolysis test
- Autoimmune (Hashimoto's) thyroiditis
- Autoimmune disorders
- Autoimmune hemolytic anemia
- Autoimmune metaplastic atrophic gastritis
- Automated external defibrillator
- Automobile safety
- Autonomic dysreflexia
- Autonomic nervous system
- Autosomes
- Avascular necrosis
- Avastin
- Avian influenza
- Avoidant personality disorder
- Axon
- Axonopathy
- Axonotmesis
- Ayurveda
- Azathioprine
- Azelaic acid
- Azimilide
- Azithromycin
- Azoospermia
- Azotemia
- AZT (see Zidovudine)
- Aztreonam
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The Merck Manual, Professional Edition