Hepatic
Relating to the liver. Hepatic conditions encompass a wide range of diseases including chronic hepatitis, hepatic lipidosis, hepatic encephalopathy, and hepatic neoplasia. The liver's central role in metabolism, detoxification, and protein synthesis makes hepatic health critical to longevity.
“Hepatic” refers to anything relating to the liver (from Greek hepar, “liver”). The liver is the largest internal organ and performs over 500 distinct functions, making hepatic health one of the most consequential factors in canine longevity.
Core Liver Functions
Metabolic
- Glucose regulation (glycogen storage, gluconeogenesis)
- Lipid metabolism (cholesterol synthesis, bile acid production)
- Protein synthesis (albumin, clotting factors, transport proteins)
- Drug and toxin metabolism (cytochrome P450 system)
Synthetic
- Albumin production (maintains blood oncotic pressure)
- Coagulation factor production (factors I, II, V, VII, IX, X, XI, XII)
- Bile acid synthesis (essential for fat digestion and absorption)
Detoxification
- Ammonia conversion to urea (preventing hepatic encephalopathy)
- Drug metabolism and clearance
- Bilirubin conjugation and excretion
Storage
- Glycogen (energy reserve)
- Fat-soluble vitamins (A, D, E, K)
- Iron and copper
Common Hepatic Conditions in Dogs
- Liver disease: broad category encompassing inflammatory, metabolic, vascular, and neoplastic liver conditions
- Hepatic encephalopathy: neurologic dysfunction from accumulating toxins (primarily ammonia) when the liver cannot perform detoxification
- Hepatic lipidosis: excessive fat accumulation in hepatocytes
- Copper storage disease: abnormal copper accumulation causing hepatocyte damage
- Portosystemic shunt: abnormal blood vessel bypassing the liver
Hepatic Blood Work Markers
The serum chemistry panel includes several hepatic markers:
- ALT (alanine aminotransferase): most specific marker of hepatocellular damage
- ALP (alkaline phosphatase): elevated in cholestatic disease, steroid hepatopathy, and bone growth
- GGT (gamma-glutamyl transferase): biliary marker
- Albumin: low levels indicate chronic hepatic synthetic failure
- Bilirubin: elevated in hepatic or post-hepatic disease (causes jaundice)
- Bile acids: fasting and post-prandial levels assess hepatic functional capacity
- BUN: may be low in liver failure (reduced urea synthesis)
- Glucose: may be low in severe hepatic failure (reduced gluconeogenesis)
The liver’s regenerative capacity means that significant disease can be present before blood work becomes abnormal. Hepatic enzyme elevation indicates damage but does not necessarily indicate functional impairment. Functional tests (bile acids, albumin, coagulation times) are needed to assess actual liver capacity.