Roche Accu-Chek Performa Manuel De L'utilisateur page 62

The blood glucose may be extremely high or a meter or test strip error has
occurred. If this confirms how you feel (symptoms), contact your healthcare
professional immediately; healthcare professionals should follow their
facility policy for treating questionable blood glucose results. If it does not
confirm symptoms, repeat the test and refer to Chapter 2 or 8, "Unusual Test
Results." If this does not confirm symptoms, run 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 E-3 code still appears for the blood glucose
test, the blood glucose result may be extremely high and above the system's
reading range. Contact your healthcare professional immediately;
healthcare professionals should follow facility policy. If the control result
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is not within the acceptable range, see Chapter 3 or 9, "Control Test Results."