Accu-Chek Performa Operator's Manual page 53

The blood glucose may be extremely
high or a meter or test strip error
has occurred. If this confirms
symptoms, follow your facility
policy for treating questionable
blood glucose results. If it does not
confirm symptoms, repeat the test
and refer to Chapter 2, "Unusual Test
Results." If this does not confirm symptoms, 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 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. Follow facility policy. If the control result is
not within the acceptable range, see Chapter 3,
"Understanding Out‑of‑Range Control Test Results."
Not enough blood or control solution
was drawn into the test strip for
measurement or was applied after
the test had started. Discard the test
strip and repeat the test.
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