| SDU | standard deviation unit; step-down unit |
|---|---|
| grav | I pregnancy one, primigravida |
| CAT | California Achievement Test; capillary agglutination test; catalase; cataract; catecholamine; Childr... |
| TAT | tetanus antitoxin; thematic apperception test; thematic aptitude test; thrombin-antithrombin complex... |
| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |