The app JBZlab consult applicants for the clinical laboratory of the Jeroen Bosch hospital laboratory guide include up-to-date reference values, determination frequency, current announcements and newsletters. The user of the app can directly consult a clinical chemist by phone or email. Users outside the Jeroen Bosch hospital can through the app information on opening hours of the blood and puncture require items. There is also background information about laboratory testing to find information