How do lactate levels guide assessment of tissue perfusion, and what does failure to clear lactate imply?

How do lactate levels guide assessment of tissue perfusion, and what does failure to clear lactate imply?

• A. Elevated lactate indicates anaerobic metabolism due to hypoperfusion or sepsis; failure to clear lactate indicates ongoing hypoperfusion or metabolic derangement.
• B. Lactate indicates hepatic function; high lactate means liver failure; persistence implies chronic disease.
• C. Lactate is a marker of oxygen content; high lactate means high oxygen; clearance relates to renal function.
• D. Lactate measures mitochondrial biogenesis; persistent elevation implies aging.

Answer: (A)