11 days ago abscess tooth, penicillin for 7 days and root canal. had done lab test week before for glucose &was 7.4. could abscess raise b/g test?

Yes: Infections can cause elevation and fluctuation of blood glucose levels.

Yes: Abnormal blood glucose levels can be the equivalent to a "dead canary in a mineshaft"- very high or low b/g levels can preceed the symptoms of an infection such as a tooth abscess. Infections stresses the body, releasing hormones that affect glucose levels

Yes: Infections anywhere in your body can result in an alteration in your blood glucose level.