Total Cholesterol 373 mg/dL: Is That High?

Is Total Cholesterol 373 mg/dL Low, Normal, or High?

Total cholesterol 373 mg/dL is very high and significantly above the levels considered safe by all major health organizations. The American Heart Association and the National Heart, Lung, and Blood Institute classify total cholesterol of 240 mg/dL and above as high. At 373 mg/dL, your reading is 110 points above that threshold and 150 points above the desirable level of under 200 mg/dL. This is a level that requires prompt medical evaluation and, in most cases, treatment that includes medication alongside aggressive lifestyle changes. A reading this high should not be ignored or postponed, but it is also important to know that effective treatments exist and many people successfully bring very high cholesterol under control.

A Total Cholesterol reading of 373 mg/dL signals a critical and immediate health concern, placing you in the "Very High" danger category and indicating significantly elevated cardiovascular risk that requires urgent medical evaluation. This value, nearly double the upper limit of the normal range (150-199 mg/dL), suggests a profound metabolic derangement. At this extreme level, genetic predispositions such as familial hypercholesterolemia, where the body struggles to effectively clear cholesterol, are a strong consideration. Less commonly, but still possible, severe underlying conditions like untreated hypothyroidism, advanced kidney disease, or certain liver disorders could contribute to such a profound elevation. Your physician will likely recommend immediate follow-up lipid panel testing, including LDL, HDL, and triglycerides, often after a fasting period, to determine the exact composition of this elevated cholesterol. Further investigations might involve genetic testing for familial causes or screening for other metabolic conditions. While lifestyle modifications will be discussed, aggressive pharmacotherapy, such as high-intensity statin therapy, will almost certainly be initiated to rapidly reduce these levels and mitigate acute risks. While daunting, it's important to understand that early and aggressive intervention at this stage can significantly alter your long-term prognosis, and such a high value often responds dramatically to appropriate treatment, reducing the immediate danger.

Hidden Risk of Total Cholesterol 373 mg/dL

At a total cholesterol of 373 mg/dL, the risks are substantial and well-documented. What makes this level particularly concerning is the speed and intensity with which arterial damage can progress. The American College of Cardiology emphasizes that very high cholesterol levels create a high cumulative cholesterol burden that accelerates cardiovascular disease.

A total cholesterol reading of 373 mg/dL significantly elevates the risk of atherosclerotic cardiovascular disease, far exceeding typical concerns. This extremely high level indicates a substantial buildup of cholesterol plaque within arteries, a process known as atherosclerosis. This plaque can narrow or block arteries, drastically increasing the likelihood of coronary artery disease, leading to heart attacks. It also heightens the risk of cerebrovascular events, such as strokes, by compromising blood flow to the brain. Furthermore, such pronounced hypercholesterolemia can contribute to peripheral artery disease, affecting circulation in the limbs and potentially leading to pain or tissue damage. The severity suggests a potent atherogenic environment promoting arterial damage.

• At 373 mg/dL, the rate of plaque buildup in your arteries is significantly faster than at borderline levels. Years of damage can be compressed into a shorter timeframe
• Very high cholesterol raises the risk of coronary artery disease, heart attack, and ischemic stroke. The risk is not just elevated, it is multiplied when combined with other factors like high blood pressure, diabetes, or smoking
• Peripheral artery disease, which causes reduced blood flow to the legs, is more common in people with sustained very high cholesterol. Symptoms include leg pain or cramping during walking
• At this level, there is a reasonable chance that a genetic component is involved. Familial hypercholesterolemia affects about 1 in 250 people and can push total cholesterol well above 300 mg/dL from a young age
• People with very high cholesterol sometimes develop visible signs such as xanthomas (yellowish deposits under the skin, often around the eyes, elbows, or tendons) or arcus senilis (a white ring around the iris)
• The danger of very high cholesterol is that arterial plaque can build up silently for years. Many people learn about blockages only when they experience a cardiac event

What Does a Total Cholesterol Level of 373 mg/dL Mean?

Total cholesterol is a combined measurement calculated from the different fats in your blood. The formula is: total cholesterol equals LDL cholesterol plus HDL cholesterol plus 20 percent of your triglycerides. At 373 mg/dL, one or more of these components is dramatically elevated, and understanding the breakdown is critical for guiding treatment.

A total cholesterol level around 373 mg/dL is most commonly driven by a combination of genetic predisposition and significant lifestyle factors, rather than solely diet. Familial hypercholesterolemia, an inherited disorder, dramatically elevates LDL cholesterol from birth, making such high readings more likely. Contributing lifestyle elements often include a diet high in saturated and trans fats, coupled with a sedentary lifestyle that fails to adequately manage lipid levels. Less commonly, but still possible at this extreme, are secondary causes like uncontrolled hypothyroidism or certain medications that can interfere with cholesterol metabolism, though primary genetic factors are often the dominant driver for this level.

LDL cholesterol is likely the biggest contributor at this level. LDL particles carry cholesterol through your bloodstream, and in excess, they penetrate the walls of your arteries. Once inside, they trigger an inflammatory response that leads to plaque. Plaque is a mixture of cholesterol, fat, calcium, and other substances that builds up over time, narrowing the artery and making it stiff. When a plaque ruptures, it can form a blood clot that completely blocks the artery, which is the mechanism behind most heart attacks and many strokes.

HDL cholesterol is the protective type that transports excess cholesterol back to the liver. Even if your HDL is normal, it may not be able to keep up with the sheer volume of LDL circulating at this level. Triglycerides, the third component, reflect fats your body stores from food. High triglycerides contribute to artery damage and are often elevated alongside high LDL.

A total cholesterol of 373 mg/dL suggests that your body is producing and circulating far more cholesterol than it can safely manage. This could be driven by genetics (familial hypercholesterolemia is a strong possibility at this level), diet and lifestyle factors, underlying medical conditions like hypothyroidism or kidney disease, or a combination of these. Your doctor will order a full lipid panel and likely additional tests to determine the root cause and build a targeted treatment plan.

Lifestyle Changes for Total Cholesterol 373 mg/dL

At 373 mg/dL, lifestyle changes alone are unlikely to bring your cholesterol into the desirable range. However, they are an essential part of a comprehensive treatment plan and significantly boost the effectiveness of medication. The American Heart Association recommends at least 150 minutes of moderate-intensity aerobic exercise per week, and at this cholesterol level, meeting or exceeding that target matters a great deal. Brisk walking, swimming, cycling, and similar activities improve your lipid profile by lowering LDL, raising HDL, and reducing triglycerides. Exercise also improves blood vessel function and reduces inflammation, both of which are critical when cholesterol is very high.

Immediate and comprehensive action is required for a total cholesterol of 373 mg/dL. The first step is a follow-up lipid panel to assess LDL, HDL, and triglycerides individually, and potentially a fasting lipid profile. Initiate aggressive dietary changes focusing on drastically reducing saturated and trans fats, increasing soluble fiber intake, and incorporating plant sterols. Significant improvements in physical activity, aiming for at least 150 minutes of moderate-intensity aerobic exercise weekly, are critical. Given the high value, referral to a lipid specialist or cardiologist is strongly recommended to explore pharmacologic treatment options, such as statins, and to investigate for underlying genetic conditions like familial hypercholesterolemia through further testing or family history assessment.

Weight management directly affects cholesterol levels. If you are carrying excess weight, especially around the midsection, losing even a modest amount can make a meaningful difference. The NIH reports that 5 to 10 percent body weight loss can lower LDL by 5 to 8 percent and improve overall cardiovascular markers. At 373 mg/dL, every percentage point of improvement counts.

If you smoke, quitting is not optional at this level. Smoking damages the artery lining, making it far easier for LDL to penetrate and form plaque. It also suppresses HDL, reducing your body's natural defense against cholesterol buildup. The combination of very high cholesterol and smoking creates a dangerously compounded risk. Talk to your doctor about cessation support if you need it.

Sleep and stress management continue to play supporting roles. Chronic sleep deprivation disrupts lipid metabolism, and sustained stress elevates cortisol, which can worsen your lipid profile. Prioritizing seven to nine hours of sleep and finding effective ways to manage stress will not fix the problem on their own, but they support every other intervention you are putting in place.

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against AHA, NIH, ACC, Mayo Clinic, PubMed guidelines · Last reviewed March 20, 2026