| PU | palindromic unit; passed urine; pepsin unit; peptic ulcer; pregnancy urine; 6-propyluracil; prostati... |
|---|---|
| UC | ulcerative colitis; ultracentrifugal; umbilical cord; unchanged; unclassifiable; unconscious; undiff... |
| HbA | hemoglobin A, adult hemoglobin |
| HbF | fetal hemoglobin, hemoglobin F |
| HBGR | hemoglobin-gamma regulator HbH hemoglobin H |