Most kidney stones are calcium stones (particularly calcium oxalate), but calcium levels in the blood often are not elevated, even in people who gets kidney stones more than once.

However, some people have uric acid stones, and bloodwork there may show high uric acid levels (hyperuricemia).

Did they also do a 24-hour urine collection? (They may not if this is only your first stone.) Urine studies can be much more helpful than blood tests when it comes to kidney stones.

Anyway, hope your stone(s) pass easily. Good luck.