Non-HDL cholesterol / HDL cholesterol ratio
Heart healthAlso known as: non-HDL to HDL ratio, atherogenic ratio, Non-HDL HDL Quotient
This ratio compares all atherogenic cholesterol particles to protective HDL cholesterol.
It reflects the balance between cholesterol delivery to tissues and cholesterol removal from tissues.
Why this matters
Higher ratios indicate a predominance of cholesterol particles that can promote arterial plaque buildup. This marker predicts cardiovascular events and supports decisions on lifestyle change or medical therapy to protect long-term vascular health.
How often should I test Non-HDL cholesterol / HDL cholesterol ratio?
Most adults benefit from checking the non-HDL to HDL ratio yearly as part of a lipid panel. After a meaningful lifestyle or medication change, retest at 6 to 12 weeks.
At baseline / for screening: Once every 12 months from age 30, alongside the rest of your lipid panel. Earlier and more frequent if you have a family history of early cardiovascular disease, elevated Lp(a), or known cardiovascular risk factors.
When monitoring an intervention or change: Retest 6 to 12 weeks after a sustained lifestyle change, such as reducing saturated fat, adding soluble fibre, meaningful weight loss, or a new aerobic routine. The same window applies after starting or adjusting cholesterol-lowering medication (statin, ezetimibe, bempedoic acid, PCSK9 inhibitor).
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