Why does the EliA ANA positive control give a negative result?

Why does the EliA ANA positive control give a negative result?

You should not dilute the ANA Control

Please enter a request (sample id),
then select a method (EL-G),
then input a testname (sy),
then press "shift enter" instead of "enter",
then you can select "prediluted" instead of "instrument dilution" (dilution factor 100 is OK for sy)

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As in all diagnostic testing, the diagnosis is made by the physican based on both test results and the patient history.