What does the Coenzyme Q10 test measure?

Why is Coenzyme Q10 measured?

Serum CoQ10 is measured to identify deficiency states — primary (rare genetic biosynthetic defects) or secondary (statin-induced depletion, mitochondrial disorders, heart failure, and potentially neurodegenerative conditions). Because the test reflects circulating rather than tissue levels, interpretation requires clinical context: symptomatic myopathy or fatigue in a statin-treated patient, evaluation of suspected mitochondrial disease, or monitoring of therapeutic supplementation. Plasma CoQ10 does not predict cardiovascular or neurological outcomes in isolation but guides replacement therapy.

Reference ranges

Standard reference

Approximately 0.4–1.6 µg/mL; assay- and population-dependent.

Functional medicine optimal

Functional and integrative sources often cite >1.0 µg/mL or >2.5 µmol/L as desirable, particularly in patients on statins or with heart failure, though such thresholds are not uniformly validated.

Units

µg/mL, µmol/L

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.