A normal HDL cholesterol level is 60 mg/dL or higher for adults, which is considered optimal for heart protection. Below that, the thresholds for “low” differ by sex: less than 40 mg/dL is low for men, and less than 50 mg/dL is low for women. These numbers come from a standard lipid panel, one of the most common blood tests in routine checkups.
HDL Ranges for Adults and Children
For men and women age 20 and older, the breakdown looks like this:
- Optimal: 60 mg/dL or above
- Low for men: below 40 mg/dL
- Low for women: below 50 mg/dL
The gap between men and women exists because estrogen tends to raise HDL levels, giving premenopausal women naturally higher numbers on average. After menopause, HDL often drops.
Children and teens (age 19 and younger) have slightly different standards. An HDL above 45 mg/dL is considered acceptable. Between 40 and 45 mg/dL is borderline, and anything below 40 mg/dL is abnormal. Pediatricians don’t routinely test cholesterol in every child, but screening is recommended for kids with a family history of early heart disease or who have obesity or diabetes.
Why HDL Matters for Your Heart
HDL particles act like cleanup crews in your bloodstream. They pick up excess cholesterol from your artery walls and carry it back to the liver, where it gets broken down into bile acids and eventually leaves your body. This process prevents cholesterol from building up into the fatty plaques that narrow arteries and cause heart attacks.
The cleanup works in stages. Small HDL particles latch onto cholesterol sitting inside artery walls, pulling it free. As they collect more cholesterol, the particles grow into larger, mature HDL that either delivers its cargo directly to the liver or transfers it to other particles that the liver can grab. Either way, the end result is cholesterol removed from places it can do damage and routed toward elimination.
When HDL is too low, this removal process slows down. A 21-year study of 8,000 men found that those with isolated low HDL (meaning their other cholesterol numbers looked fine) had a 36% higher rate of dying from coronary heart disease. For men who also had diabetes, that gap widened to 65%. Low HDL isn’t just a secondary concern on your lab report. It’s an independent risk factor.
When HDL Is Too High
For years, the assumption was that higher HDL is always better. That turns out to be incomplete. A systematic review and meta-analysis found a U-shaped relationship between HDL and death: extremely high levels are also linked to increased cardiovascular risk. In women, HDL above 116 mg/dL was associated with a 47% higher risk of cardiovascular death. In men, the risk started climbing above 94 mg/dL, with a 29% increase. These are unusual levels that most people will never reach, but if your HDL comes back surprisingly high, it’s worth discussing with your doctor rather than assuming it’s purely good news.
How HDL Fits Into Your Overall Risk
Your HDL number doesn’t exist in isolation. The newest cardiovascular risk calculators use HDL alongside your age, sex, blood pressure, total cholesterol, diabetes status, tobacco use, kidney function, and whether you’re already on medications. A slightly low HDL in an otherwise healthy 30-year-old means something very different from the same number in a 60-year-old with diabetes and high blood pressure.
One useful number your doctor can calculate from the same blood test is non-HDL cholesterol, which is simply your total cholesterol minus your HDL. This captures all the “bad” cholesterol-carrying particles in a single figure and correlates well with heart disease risk. If your total cholesterol is 200 and your HDL is 55, your non-HDL cholesterol is 145. It’s a broader measure of risk than LDL alone.
Do You Need to Fast Before Testing?
Probably not. HDL levels are largely unaffected by whether you’ve eaten recently. While eating can shift triglycerides by up to 26 mg/dL and LDL by about 8 mg/dL, HDL stays essentially the same in fasting and nonfasting samples. Guidelines in the U.S., Canada, the U.K., Denmark, Brazil, and across Europe now endorse nonfasting lipid panels as reliable for routine screening. If your doctor still asks you to fast, it’s usually because they want the most accurate triglyceride or LDL reading, not because of HDL.
How to Raise Low HDL
Exercise
Aerobic exercise is the most reliable lifestyle tool for raising HDL. A meta-analysis of 148 exercise trials found that regular training raised HDL by about 2 mg/dL on average, and longer sessions produced bigger gains: each additional 10 minutes of exercise duration corresponded to roughly a 1.4 mg/dL increase. That might sound modest, but it compounds over time and comes bundled with benefits for blood pressure, blood sugar, and triglycerides. Exercise appears to be most effective for people who aren’t severely obese (BMI under 28) and those starting with higher total cholesterol.
Dietary Fat Quality
The type of fat you eat matters more than the total amount. Trans fats, found in some processed and fried foods, lower HDL while raising LDL, a combination that pushes cardiovascular risk in the wrong direction on both fronts. Replacing trans fats and saturated fats with unsaturated fats (olive oil, nuts, avocados, fatty fish) helps preserve or raise HDL levels. This swap doesn’t need to be extreme. Even modest substitutions, like cooking with olive oil instead of butter or choosing nuts over packaged snacks, shift the balance.
Other Lifestyle Factors
Smoking suppresses HDL, and quitting reliably raises it. Losing excess weight, particularly abdominal fat, also helps. Alcohol in moderate amounts has been associated with higher HDL, but the cardiovascular risks of drinking generally outweigh this single benefit, so it’s not a recommended strategy. The metabolic pattern of abdominal obesity, high triglycerides, low HDL, elevated blood sugar, and high blood pressure tends to cluster together. Improving any one of those factors often pulls the others in the right direction as well.