The bloodwork should have been done when I was at the hospital the first time earlier in the month. The fact that it has been ordered so late, makes me think that it isn't a real serious possibility. I am thinking they are more concerned with it being a possible gout.
FWIW, when we thought I might have gout, the first thing the doctor did was... order blood work. Uric acid level, IIRC.
I hope you get some answers soon!