Linked from
The 14 pages that link to Lactate, each with the reason it gives.
GluconeogenesisRelated: Lactate supplies carbon that the liver can convert back into glucose.
Lactic acidRelated: At physiological pH, lactic acid largely exists in this ionized form.
Cardiogenic shockRelated: Elevated lactate can signal the tissue hypoperfusion caused by shock.
CatabolismRelated: It is a product of glycolysis that can circulate and be oxidized elsewhere.