"Hazy" reports are usually caused by build-up of proteins on the inner wall of the pipettes. Another cause is growth of micro organisms in the diluter system. It is extremely important that the system is kept sterile.

Erroneous haziness looks more like haemolytic plasma than 'normal' hazy plasma. If there is an abnormal number of 'hazy' aspects, check the dispenser system carefully and clean it if there is any doubt.

Symptoms for a contaminated instrument:

1. If more than 3… 5 out of 20 measurements are reported HAZY.
2. Poor meniscus may be reported.
3. Incorrect results.

In case of hazy reports:

1. First run an extra Fill and Clean sequence.
2. Check after a day's run if haziness is decreased. See History analyse results.
3. When there are still many reports, it is recommended to clean the diluter system. See WI-240 Cleaning the diluent system.

Example of haziness