My husband has never really taken care of himself, I recently got him into the doctors after he was feeling ill. They did a lot of blood work his ast was 254 his alt was 405 she ordered upper endoscopy, colonoscopy,hep c ab w/reflex, hcv RNA,quant,rt and pcr. His results came back reactive to the hepatitis ab and his signal to cutoff is 27.80 which was flagged for high. He just had a full abdominal u/s this morning. I would like to know what does the SIGNAL TO CUTOFF mean. Thank you for your time