Yep, you're spilling some protein outside pregnancy. The units are different from what we use here, but if you treat this as a baseline reading, you're spilling 440mg - so you'd meet diagnostic requirements for preeclampsia proteinuria if you were pregnant. It's possible that's because of a temporary issue like an infection, or it's possible that you've got a little underlying kidney damage. Or both.
Don't let that completely freak you out. We've had posters with baselines that high at the start of successful second and third pregnancies. By "successful" I mean they developed preeclampsia at some point, and maybe did some NICU time, but took home living healthy babies. Usually these levels show up in women with underlying conditions like Type I diabetes or hyperfiltrating kidneys. Even a childhood illness with a high fever can cause a little kidney damage and leave you with hyperfiltrating kidneys, so it's not *that* unusual. You'll want to talk to a few docs in preconception appointments, find out what they'd recommend in a subsequent pregnancy, and make a plan.
I can think of at least three posters off the top of my head: SaraB (one of our admins), Kara (one of our mods), and MommyBoo (who IIRC has 6 living children, all with proteinuria and preterm deliveries.) Also, here's a thread: http://www.preeclampsia.org/forum/viewt ... 12&t=42935