| TBNAA | total body neutron activation analysis |
|---|---|
| T4(D) | serum thyroxine measured by displacement analysis |
| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
| XA | xanthurenic acid; x-ray analysis |
| BTSS | Biopsy Tissue Scrub Smear |