CD-Chex Plus® BC and CD-Chex® Plus BC CD4 Low are new assayed controls for immunophenotyping with Beckman Coulter® flow cytometry systems, including the Coulter® Prep-Plus™. CD-Chex Plus BC verifies the accuracy and reproducibility of all the steps involved in the process of immunophenotyping, including red blood cell lysis. Reference values are established for five subsets of leukocytes: T lymphocytes, B lymphocytes, granulocytes, monocytes, and NK cells. CD-Chex Plus BC CD4 Low offers a depressed CD4 absolute number often found in patients with immunodeficiency diseases. Both products offer a 30-day open-vial stability and a 90-day closed-vial stability and are available in plastic vials with pierceable caps containing 3.0 mL fill. Unlike a fresh whole-blood sample, the stability of CD-Chex Plus BC and CD-Chex Plus BC CD4 Low provide reproducible data when used for daily quality control of immunophenotyping procedures. STATS®, a free interlaboratory quality-control program, is available for qualifying CD-Chex Plus BC customers. STATS produces relevant peer-group comparison reports and graphs with a quick turnaround time. Data can be submitted by mail, fax, or e-mail. The reports include customer data, peer-group averages, and computer-generated Levey-Jennings graphs.

Streck
(800) 843-0912; www.streck.com