| Ultra Sensitive PSA |
| UltraSensitive IGA |
| Unstable Hemoglobins |
| Urea Nitrogen, 24 hour Urine |
| Urea Nitrogen, Fluid |
| Urea Nitrogen, Random Urine |
| Ureaplasma Culture |
| Ureter - Cytology |
| Ureteral Wash - Cytology |
| Uric Acid |
| Uric Acid 24 Hour Urine |
| Uric Acid Random Urine |
| Urinalysis with Reflex Microscopic |
| Urine - Cytology |
| Urine Culture |
| Urine Protein/Creatinine Ratio |
| Urine, Catheterized - Cytology |
| Urine, voided - Cytology |
| Uroporphyrin-1-Synth |
