Istat Deselect Test Option

One can utilize the Customization Workspace/Analyte Enable tab on the DE server to select the cartridge type and enable/disable the specific analytes. It might not solve all your needs, but it is an option.

Yes through DE Customization turn test select on but combination have to be set-up in interface. 

I should have clarified, can an IStat user be enabled to deselect a test on the Istat itself without going into the DE Customization?

You should be able to just select the test(s) needed on the "ordering" screen. Our NICU often selects the blood gas and glucose or Hct on the CG8 cartridge. They either select all (0) and then deselect the undesired tests or just hit the numbers of the tests they do want.

Yes, to allow operator to select which tests to run, this box must be checked.