This is why the swabs are an important tool in addition to the XRF. If the swab turns red, then by definition it's wiping mobile lead from the surface of the object you're testing.
Using electrical cords as an example, years ago I went through my house and swabbed all of the cords. If I found a cord that turned a swab red, I either threw the thing away if it was cheap, like an old coffee grinder, or I replaced the cord if I didn't want to replace the whole machine, like the cords on all of our Oreck vacuum cleaners.
A lot of newer cords have lead in the insulation as indicated by XRF, but won't turn a swab pink. These I don't worry about too much, but I still tell the kids to wash their hand after handling them.
EDIT:
The LeadCheck swabs are pretty expensive, and using a whole swab for just one or two objects is ridiculously wasteful, but I have a trick that makes them cheap. I cut the cotton head off of a Q-tip cosmetic swab so that it's just a rolled paper rod. I activate the LeadCheck swab and squeeze out a drop of the liquid onto the upright surface of the swab. I dab the end of the decapitated Q-tip in the liquid, and I use that to swab the surface of whatever I'm testing. If something turns the paper red, I clip the end of the shaft off with nail clippers to get a fresh end, and continue to the next object.
I can get dozens of tests out of a single swab this way. I make a list of things to test in one afternoon, and I can get the whole pile done for the cost of a single swab, instead of spending hundreds of dollars it would take to use a new LeadCheck swab for each object.
Plus, the hard paper Q-tip shaft works better for aggressively rubbing on surfaces.