| JA | judgment analysis; juvenile atrophy; juxta-articular |
|---|---|
| JAI | juvenile amaurotic idiocy |
| JAMA | Journal of the American Medical Association |
| JAMG | juvenile autoimmune myasthenia gravis |
| JAMIA | Journal of the American Medical Informatics Association |
| JAN | Japanese accepted name |
| JAS | Jenkins Activity Survey; juvenile ankylosing spondylitis |
| jaund | jaundice |