VITROS CRP Slides: (1) Cat # 192 6740, 250 slides per box, and (2) Cat # 809 7990, 90 slides per box. Firm on the label: Ortho-Clinical Diagnostics, Inc., Rochester, NY 14626. The CRP Slides are for use on the Vitros 250/250AT and/or Vitros 950/950AT Clinical Chemistry Systems. For in vitro diagnostic use. Vitros CRP slides quantitatively measure C-reactive protein concentration in serum and plasma.