Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VITROS 250 BUN UREA found under Test Slide Urea Nit by Ortho Clinical Diagnostics Inc. The National Stock Number assigned to this part is 6550012219262, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like VITROS 250 BUN UREA.