Hiya Pete.
I will copy and paste some info for you, I think it probably explains it better then i could (well probably alot quicker than me anyway
)
What i will say though is that Tarzans readings may be high but they can go much higher and i am sure cats can live with slightly high readings for a fair length of time (depending on the cause of course)
Also my soots had high ALT for probably closer to 2 years .. He was fiv/felv positive so slightly different circumstances but that gives you an idea. Also many cats have high readings can go back to "normal" reference ranges.
Tell me what drugs is it he gets to reduce the levels ? (purely for my own curiosity)
ALT (
Alanine aminotransferase)
ALT is almost liver specific in dogs and cats. It is found in the cytoplasm of hepatocytes and is released into the blood during changes in cell membrane permeability or necrosis. Its superficial location means that a relatively mild insult ,e.g. hypoxia, may lead to increased serum levels. Half life is about 60 hours in the dog and shorter in the cat.. In chronic hepatic disease with loss of functional mass levels may be deceptively low. In acute disease a rapid decline in levels may be a favourable sign. Recent work has demonstrated that ALT levels may also increase due to increased synthesis and release by healthy hepatocytes.
ELEVATED LEVELS
Primary Hepatopathies
Acute liver disease
Chronic active hepatitis (dog) - Fibrosis/cirrhosis
Poisoning/Toxicity hepatitis
Cholangiohepatitis (cat)
Lymphocytic cholangitis (cat)
Acute pancreatitis
Obstructive jaundice (slightly raised)
Pregnancy (slightly raised)
Glucocorticoid use
Hypoxia
Acute pancreatitis
Hepatic neoplasia
Secondary hepatopathiesCopper storage disease
Hyperthyroidism (cat)
Hyperadrenocorticism
Diabetes mellitus
Glucocorticoid therapy
Hypothyroidism (dog)
Post hepatic obstructive jaundice
Hope that info is ok, sort of explains it quite well i think but please dont go over alarmed with the list of possible causes, i pondered on wether to scrub that bit out but i'm sure you'd rather see the extract in full. I'm sure it will be more to do with post op reasons rather than any other.