The Lactate Plasma test measures lactic acid levels in the blood to assess oxygen delivery and metabolic function. Elevated levels may indicate tissue hypoxia, impaired circulation, or metabolic disorders.This test is commonly ordered in cases of heart attack, congestive heart failure, renal failure, uncontrolled diabetes (especially diabetic ketoacidosis), sepsis, shock, liver disease, and respiratory failure. It helps diagnose lactic acidosis, monitor critical conditions, and guide treatment decisions.