Old post but replying for anybody who might see this as it could save a life.

LIVER FUNCTION TESTS ARE NOT ACCURATE WITH CIRRHOSIS. You must request scans if you are concerned

My mom had normal LFTs in February, her creatinine, B12 and D were low which are actually signs but they were put down to menopause. In Oct she passed from liver failure, less than 1 month after being admitted to hospital with her first symptoms.

The consultant told me that liver function blood tests can only test on healthy liver, so a person with lots of scarred liver would in theory have better results because they have less healthy liver to test on meaning lower results.