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| American College of Radiology | 
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| American Medical Association (AMA) | 
| American Nurses Association (ANA) | 
| American Society for Clinical Pathology (ASCP) | 
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| Amino acids, blood | 
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| Aminotransferase | 
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| Ammonium biurate | 
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| Amniotic fluid α1-fetoprotein (AFP) | 
| Amniotic fluid and desaturated phosphatidylcholine (DSPC) | 
| Amniotic fluid bilirubin optical density (BOD) | 
| Amniotic fluid color | 
| Amniotic fluid creatinine | 
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| Amniotic fluid index (AFI) | 
| Amniotic fluid lecithin-to-sphingomyelin (L/S) ratio | 
| Amniotic fluid shake test |