most likely they did whats called a chem7...just routine blood work...basically checking your electrolytes (mainly potassium and sodium), calcium, mg, po4...prolly checked your rbc count, platelets, hemoglobin (iron) hematocrit...basically making sure everything is within normal limits...i wouldn't think they're checking for any diseases...maybe your white blood cell count to see if you have an infection...i wouldn't worry about it though, unless something comes up...