Since this is just a marker test, "Indeterminate" results mean that some of the markers are found, and some are not. So the gene could be present, or not present. Indeterminate actually could be affected, carrier or clear, it is just not possible to tell, because the markers are incomplete.
Marker testing is a little trickier than direct testing. It is good, but there are holes in the test, since the genes and markers aren't totally "fixed" in their positions on the genome. Markers and the genes they are used to track can become separated by mutations.