Review Article

Clinical and Diagnostic Significance of Lactate Dehydrogenase and Its Isoenzymes in Animals

Table 1

Disorders or conditions that can cause increased serum LDH activity (adapted from Stockham and Scott).

Hepatocyte damage
(i) Degenerative—hypoxia due to anemia or congestion and cholelithiasis
(ii) Metabolic—lipidosis or fat cow syndrome, diabetes mellitus, and equine hyperlipidemia
(iii) Neoplastic—lymphoma and metastatic neoplasia and hepatocellular carcinoma
(iv) Inflammatory
 (a) infectious—bacterial and necrotic hepatitis, cholangiohepatitis, and hepatic abscess
 (b) noninfectious—Theiler’s disease, chronic hepatitis, and cirrhosis
(v) Toxic—iron toxicity, alkaloid-containing plants, and aflatoxins
Muscle damage: skeletal or cardiac muscle (mostly skeletal)
(vi) Degenerative—hypoxia due to exertion or seizures, exertional rhabdomyolysis, and saddle thrombus
(vii) Metabolic and nutritional—feline hyperthyroidism and vitamin E or selenium deficiency
(viii) Neoplastic—metastatic neoplasia
(ix) Inherited—musculodystrophy and hyperkalemic myopathy
(x) Inflammatory—myositis (Neospora and Toxoplasma), bacteria, or other agents
(xi) Toxic—monensin, castor bean, and gossypol
(xii) Traumatic—intramuscular injection, hit-by-car, recumbency, seizures, and exertion
Haemolysis (or prolonged serum contact with erythrocytes)