Ajax Harwood Clinic
Coenzyme Q10 (CoQ10)
This test is rarely useful for the reasons people usually ask about it.
What this test is
Coenzyme Q10, or CoQ10, is a substance your cells use to make energy. Some clinics offer a blood test to check your CoQ10 level, often for muscle aches from a cholesterol medicine called a statin. Statins do lower CoQ10 in the blood. Studies disagree on whether a CoQ10 supplement eases statin muscle aches. But there is no proven way to use a blood test to decide who needs it. If you try one, you do not need a blood test first. CoQ10 testing does matter in one rare situation. A genetic condition causes very low CoQ10 from birth or childhood, causing serious muscle and nerve problems. Specialists diagnose that. For everyday fatigue or muscle aches, this blood test does not usually change your care.
Want to see the full clinical reasoning? The reference we use for this test is open to anyone — it is detailed and written for clinicians, and you are welcome to read it.
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General health information for Ajax Harwood Clinic patients and the public — not medical advice, and not a substitute for seeing your own doctor. Last reviewed 2026-09-23.