Roche CoaguChek XS Manuel D'utilisation page 93

Turn the meter off and remove the test strip. Repeat the measurement
using a new test strip and blood taken from a new puncture site at the tip
of another finger. Do not touch or remove the test strip when a test is in
progress.
Note on Error 7 "Measurement": The CoaguChek XS PT test strip may
be used for patients under a combination therapy of oral anticoagulants
plus heparin injections. For maximum heparin concentrations which do
not interfere with the test, please refer to the package insert. Under no
circumstances, however, should heparinized capillary tubes be used for
sample application. If capillaries are used, please use only the dedicated
CoaguChek capillary tubes. Be sure to apply the blood drop to the test
strip within 15 seconds of lancing the fingertip.
This error message (7) can occur in rare cases, i.e. in
patients with long coagulation times (> 8 INR, < 5%
Quick). If this error message appears again when you
WARNING
repeat the test, your results must be checked using
another method. Please contact the doctor treating you
immediately.
Solution
Error Messages
93