Siemens DCA Vantage Operator's Manual page 198

• the reader is held too far from the label
• the background reflection too high or low
If the reader is unable to consistently read your labels, apply a test label of the
format being used to a new specimen tube and perform the Barcode Test. If
the reader is able to read the test label, the quality of your labels may be
suspect. If the test label cannot be read, the reader itself is suspect.
If you have problems that cannot be resolved, contact your local technical
support provider.
198 DCA Vantage Operator's Guide