The user's blood glucose may be extremely high or a meter or a test strip error has occurred.

• If the test result matches how the user feels, contact a healthcare professional immediately.
• If the test result does not match how the user feels, repeat the blood glucose test.
• If the E-3 code still appears for the blood glucose test, the user's blood glucose result may be extremely high and above the system's reading range. Contact a healthcare professional immediately.
• If the second test result does not match how the user feels, perform a control test with the control solution and a new test strip.
• If the control result is within the acceptable range, review the proper testing procedure and repeat the blood glucose test with a new test strip.
• If the control result is not within the acceptable range, see Chapter 4 of the Accu-Chek Performa Nano User Manual - Understanding Out-of-Range Control Results.