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2,4-DNPH 2,4-Dinitrophenylhydrazine
3-MCC 3-Methylcrotonyl-CoA carboxylase
17-OHP 17-Hydroxyprogesterone
A1AT or AAT α1-Antitrypsin
AaDO2 Alveolar-to-arterial oxygen gradient
A/a gradient Alveolar/arterial gradient
AAOS American Academy of Orthopedic Surgeons
AAP American Academy of Pediatrics
AAP-CON The American Academy of Pediatrics Committee on Nutrition
a/A ratio Arterial/alveolar oxygen ratio
AATD α1-Antitrypsin deficiency
A’s and B’s Apnea and bradycardia
ABC Airway, breathing, circulation
ABR Auditory brainstem response
ABS Amniotic band syndrome
A/C Assist/control
ACAAI American College of Allergy, Asthma, and Immunology
ACE Angiotensin-converting enzyme
ACF Asymmetric crying face
aCGH Array comparative genomic hybridization
AChR Acetylcholine receptor
ACIP Advisory Committee on Immunization Practices
ACLS Advanced Cardiac Life Support
ACMG American College of Medical Genetics and Genomics
ACOG American College of Obstetricians and Gynecologists
ACT Activated clotting time; activated coagulation time
ACTH Adrenocorticotropic hormone
ADH Antidiuretic hormone
ADHD Attention deficit hyperactivity disorder
ADMA Asymmetric dimethylarginine
AE Adverse effects
AED Automatic external defibrillator; antiepileptic drug
AEDV Absent end-diastolic velocity
aEEG Amplitude-integrated electroencephalography
AEP Auditory evoked potential
AFB Acid-fast Bacillus
AFI Amniotic fluid index
AFP α-Fetoprotein
AF PCR Amniotic fluid polymerase chain reaction
AGA Appropriate for gestational age
AGS Adrenogenital syndrome
AHA American Heart Association; α-hydroxy acids
AHT Abusive head trauma
Al Aortic insufficiency
AIDS Acquired immunodeficiency syndrome
AIS Amniotic infection syndrome; arterial ischemic stroke
AIT Alloimmune thrombocytopenia
ALARA As low as reasonably achievable
ALGS Alagille syndrome
ALP Alkaline phosphatase
ALRI Acute lower respiratory tract infection
ALT Alanine aminotransferase
ALTE Apparent life-threatening event
AM Morning
AMC Arthrogryposis multiplex congenita
ANC Absolute neutrophil count
Ao Aortic
Aol Aortic isthmus
AOI Apnea of infancy
AOP Apnea of prematurity
AP Anteroposterior
Apgar Appearance, pulse, grimace, activity, respirations
API Anal position index
ApoA-1 Apolipoprotein A1
APR Acute-phase reactants
aPTT Activated partial thromboplastin time
AR Autosomal recessive
ARA/AA Arachidonic acid
ARC AIDS-related complex
ARC syndrome Arthrogryposis–renal dysfunction–cholestasis
ARD Antibiotic removal device; antiretroviral drug
ARDS Acute respiratory distress syndrome
AREDFV Absent or reversed end-diastolic flow velocity
ARF/AKI Acute renal failure/acute kidney injury
ARHB Age-related/height-based
ARM Anorectal manometry
ART Assisted reproductive technology; antiretroviral therapy
ARV Antiretroviral
AS Aortic stenosis
ASA Argininosuccinic aciduria; American Society of Anesthesiologists
ASAP As soon as possible
ASD Atrial septal defect
ASH Asymmetric septal hypertrophy
ASPEN American Society for Parenteral and Enteral Nutrition
AST Aspartate aminotransferase
ATN Acute tubular necrosis
ATP Adenosine triphosphate
ATTEND Attunement, trust, touch, egalitarianism, nuance, and death education
AV Atrioventricular; arteriovenous
A-VO2 Arteriovenous oxygen difference
B19V Parvovirus B19
B/A Bilirubin-to-albumin ratio
BA Biliary atresia
BAEP Brainstem auditory evoked potential
BAER Brainstem audiometric evoked response
BAS Balloon atrial septostomy
BASDs Bile acid synthesis disorders
BBS Bronze baby syndrome
BCAA Branched-chain amino acids
BCG Bacille Calmette-Guérin
BD Base deficit
BE Base excess
BEAT-ROP Bevacizumab Eliminates the Angiogenic Threat of Retinopathy of Prematurity
BF Breast feeding
BG Babygram (radiograph that includes the chest and abdomen)
β-hCG β-Human chorionic gonadotropin
BIA Bacterial inhibition assay
bid Twice daily
BIIP Behavioral Indicators of Infant Pain
BIND Bilirubin-induced neurologic dysfunction
BIO Binocular ...

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