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Abdominal MRI Abdominal Ultrasound Abdominal X-Ray ABGs (Arterial Blood Gases) Test ABO Blood Typing Acoustic Reflex Test ACTH (Adrenocorticotropic Hormone) Test ACTH Suppression Test Activated Partial Thromboplastin Time Adrenaline Measurement in Blood Adrenocorticotropic Hormone AFP (Alpha-Fetoprotein) Test Air Contrast Study Alanine Aminotransferase (ALT) Albumin Test, Blood Albumin Urine Test Alcohol, Breath Test Aldosterone in Blood Aldosterone in Urine Alkaline Phosphatase Allergy Tests Alpha-Amylase Test Alpha-Fetoprotein (AFP) in Blood ALT (Alanine Aminotransferase) Ambulatory Electrocardiogram Ammonia Amniocentesis Amylase ANA (Antinuclear Antibodies) Test Angiogram Angiogram of the Head and Neck Angiogram of the Lung Angiography, Fluorescein Anoscopy Antinuclear Antibodies (ANA) Antisperm Antibody Test Antithyroid Antibody Tests Aortic CT Angiogram APTT (Activated Parital Thromboplastin Time) Arm X-Ray Arterial Blood Gases Arteriography Arthrocentesis Arthrogram (Joint X-Ray) Arthroscopy Aspartate Aminotransferase (AST) Aspiration, Bone Marrow AST (Aspartate Aminotransferase) Audiometry Auditory Brainstem Evoked Potential (ABEP) Test Autoimmune Disease Tests Autopsy