Siemens Chek-Stix Combo Pak Catalog Number: 1364 Chek-Stix Positive and Negative Control Strips for Urine Chemistry: When used with Siemens reagent strips and tablets for urinalysis, CHEK-STIX positive and negative control strips provide defined results for glucose, bilirubin, ketone (acetoacetic acid), specific gravity, blood, pH, protein, urobilinogin, nitrite, and leukocytes

When these lots of control material are reconstituted, the positive control solution leukocyte result may become negative if the solution is held for more than two hours above 25C (77F).

Siemens issued An Urgent Field Safety Notice via e-mail to all affected SiemensHealthcare Diagnostics Regional offices on November 21, 2012 both in the United States and foreign accounts. This notice informed customers of the issue with the CLINITEK Atlas and Chek-Stix Positive Urinalysis Control Solutions When these lots of control material are reconstituted, the positive control solution leukocyte result may become negative if the solution is held for more than two hours above 25C (77F). You can use the reconstituted positive control solution for up to eight hours if the solution is held at 25C (77F) or lower. If the operating temperature is greater than 25C and lower than 30C (77F and 86F), the solution can be used for up to two hours. For questions regarding this recall call 781-269-3158.