| UBA1Q | UBA1 Mutation Quantitative Detection, VEXAS syndrome, Droplet Digital PCR, Varies Mayo Clinic Laboratories in Rochester | 
      
        | UBIQ | Ubiquitin (UBIQ) Immunostain, Technical Component Only Mayo Clinic Laboratories in Rochester | 
      
        | UGTFZ | UDP-Glucuronosyltransferase 1A1 (UGT1A1), Full Gene Sequencing, Varies Mayo Clinic Laboratories in Rochester | 
      
        | ULCH | Ulocladium chartarum, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | UNIPD | Uniparental Disomy, Varies Mayo Clinic Laboratories in Rochester | 
      
        | UEBF | Urea Nitrogen, Body Fluid MCHS- La Crosse Lab | 
      
        | URAU | Urea, 24 Hour, Urine Mayo Clinic Laboratories in Rochester | 
      
        | URBRP | Ureaplasma species, Molecular Detection, PCR, Blood Mayo Clinic Laboratories in Rochester | 
      
        | URPRP | Ureaplasma species, Molecular Detection, PCR, Plasma Mayo Clinic Laboratories in Rochester | 
      
        | UREPCR | Ureaplasma species, Molecular Detection, PCR, Varies Mayo Clinic Laboratories in Rochester | 
      
        | URCU | Uric Acid, 24 Hour, Urine Mayo Clinic Laboratories in Rochester | 
      
        | URICE | Uric Acid, Ice Transport, Serum MCHS- La Crosse Lab | 
      
        | U1A1Q | Uridine Diphosphate (UDP) Glucuronosyltransferase 1A1 TA Repeat Genotype, UGT1A1, Varies Mayo Clinic Laboratories in Rochester | 
      
        | GALE | Uridine Diphosphate-Galactose 4' Epimerase, Blood Mayo Clinic Laboratories in Rochester | 
      
        | ROUAU | Urinalysis, Random, Urine MCHS- La Crosse Lab | 
      
        | UPII | Uroplakin II Immunostain, Technical Component Only Mayo Clinic Laboratories in Rochester | 
      
        | UPGDW | Uroporphyrinogen Decarboxylase, Washed Erythrocytes Mayo Clinic Laboratories in Rochester | 
      
        | UPGD | Uroporphyrinogen Decarboxylase, Whole Blood Mayo Clinic Laboratories in Rochester | 
      
        | UPGC | Uroporphyrinogen III Synthase (Co-Synthase), Erythrocytes Mayo Clinic Laboratories in Rochester | 
      
        | UROCAM | UroVysion for Detection of Bladder Cancer, Urine Mayo Clinic Laboratories in Rochester | 
      
        | USPF | USP6 (17p13), Aneurysmal Bone Cyst and Nodular Fasciitis, FISH, Tissue Mayo Clinic Laboratories in Rochester | 
      
        | USTEK | Ustekinumab Quantitation with Antibodies, Serum Mayo Clinic Laboratories in Rochester | 
      
        | USNU | Ustilago nuda, Mold Grain Rust, IgE, Serum Mayo Clinic Laboratories in Rochester |