LDL Cholesterol · high result
High LDL cholesterol: what the levels mean, causes and what to do next
Short answer
LDL cholesterol is the main driver of atherosclerosis, and risk rises with the level and the years of exposure. Below 100 mg/dL is optimal for most adults, 130–159 borderline high, 160–189 high, and 190 or above very high — the level at which familial hypercholesterolemia is considered and statin therapy is recommended regardless of calculated risk. Before treating, the secondary causes are excluded once: hypothyroidism, nephrotic syndrome, cholestatic liver disease and a handful of medications. Treatment decisions use the 10-year risk estimate, and the LDL is rechecked 4–12 weeks after any change.
Medically reviewed by Youmna DiStefano, MD · Last reviewed November 2026
When does this result need same-day care?
- Chest pain or pressure, breathlessness, or arm, jaw or back pain with sweating — emergency care; the LDL is tomorrow's problem
- An LDL of 190 or more in a child or young adult, or with tendon xanthomas — prompt evaluation for familial hypercholesterolemia, including relatives
What is the normal range for LDL Cholesterol?
- age 18+: 0 – 100 mg/dL
Above 100 mg/dL is considered above optimal; targets vary by individual cardiovascular risk.
Full reference table, citations and testing options: LDL Cholesterol biomarker page.
What are the common causes of high LDL Cholesterol?
- Diet high in saturated and trans fat, excess weight and inactivity — the everyday causes, worth 10–20% of the LDL
- Genetics — polygenic high LDL is common; familial hypercholesterolemia (about 1 in 250) produces an LDL of 190 or more from childhood, often with tendon xanthomas, a corneal arcus before 45 and early heart disease in the family
- Hypothyroidism — the most common reversible secondary cause; correcting it can lower LDL 20–30%
- Nephrotic syndrome and chronic kidney disease; cholestatic liver disease (primary biliary cholangitis, obstruction)
- Medications — thiazides, some beta-blockers, cyclosporine and tacrolimus, glucocorticoids, anabolic steroids, progestins, isotretinoin, some antipsychotics and HIV protease inhibitors
- Ketogenic and very-low-carbohydrate diets, which raise LDL markedly in some lean, metabolically healthy people
- Pregnancy (LDL rises in the second and third trimesters), menopause, anorexia nervosa and rapid weight loss
- Type 2 diabetes and insulin resistance — LDL is often only modestly raised but the particles are small, dense and more numerous (ApoB is the better measure here)
What symptoms go with high LDL Cholesterol?
- None — high LDL is found on a lipid panel, and the first symptom of years of exposure can be a heart attack or stroke
- Tendon xanthomas (knuckles, Achilles), xanthelasma on the eyelids and a gray corneal arcus before age 45 in familial hypercholesterolemia
- Chest pain or pressure on exertion, breathlessness, leg pain on walking — signs of established atherosclerosis, not of the number itself
What do clinicians usually check next?
- Confirm with a repeat panel (fasting if triglycerides were high), and add apolipoprotein B or non-HDL cholesterol when triglycerides are above 150 or there is diabetes or insulin resistance
- Exclude the secondary causes once: TSH, a metabolic panel with albumin and liver enzymes, a urine albumin-to-creatinine ratio, and a medication review
- Lipoprotein(a) once in a lifetime — an inherited risk the lipid panel does not show, and a risk enhancer that lowers the treatment threshold
- A 10-year ASCVD risk estimate (age, sex, blood pressure, smoking, diabetes, HDL and total cholesterol): below 5% lifestyle; 5–7.5% a discussion; 7.5–20% a statin is reasonable, with a coronary calcium score to settle uncertain cases; above 20% treat
- LDL of 190 or more: statin therapy regardless of risk score, a family history and examination for familial hypercholesterolemia, and testing of first-degree relatives
- Recheck 4–12 weeks after starting or changing treatment or diet, then every 3–12 months; the usual goals are a 30–50% reduction and an LDL below 70 mg/dL in established disease (below 55 in the highest-risk groups)
Follow-up tests available at TestWell: TSH Test (Thyroid Stimulating Hormone) ($20.99), TSH with Reflex to Free T4 Test ($29.99), TSH + Free T4 Test ($27.99), Calcium Test ($16.99).
After starting or changing a statin or other LDL-lowering treatment, the 2018 AHA/ACC cholesterol guideline calls for a repeat lipid panel 4–12 weeks later to confirm the response, then every 3–12 months once stable. Adults not on treatment are typically re-screened every 4–6 years, sooner with risk factors or a borderline result.
How do you recheck LDL Cholesterol?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| General Wellness Panel | Panel · 4 tests | $49.99 | Yes | 1–3 business days |
| Peptide Essentials Panel | Panel · 4 tests | $89.99 | Yes | 1–3 business days |
| Heart Health Panel | Panel · 5 tests | $99.99 | Yes | 3–5 business days |
| Lipid Panel | Test · 4 biomarkers | $19.99 | Yes | 1–3 business days |
Common questions
What LDL level is too high?
Below 100 mg/dL is optimal, 100–129 near optimal, 130–159 borderline high, 160–189 high, and 190 or more very high — the level at which familial hypercholesterolemia is considered and a statin is recommended regardless of calculated risk. For someone with established heart disease the goal is below 70 (below 55 in the highest-risk groups), so 'too high' depends on who you are.
What causes high LDL besides diet?
Genetics first — polygenic high LDL is common and familial hypercholesterolemia affects about 1 in 250 — then hypothyroidism, nephrotic syndrome, cholestatic liver disease, pregnancy, menopause and medications including thiazides, cyclosporine, steroids, isotretinoin and some antipsychotics and HIV drugs. Ketogenic diets raise LDL sharply in some lean people.
How fast can LDL come down?
Diet changes — less saturated and trans fat, more fiber and unsaturated fat — lower LDL 10–20% within 6–12 weeks; weight loss adds a little. Statins lower it 30–50% within 4–6 weeks, ezetimibe another 15–20%, and PCSK9 inhibitors 50–60%. The recheck is at 4–12 weeks because the level has stabilized by then.
Do I need to fast for an LDL test?
Not for screening — non-fasting panels are acceptable in the 2018 AHA/ACC guideline and LDL changes little with a meal. Fast 9–12 hours when triglycerides were 400 mg/dL or more (calculated LDL becomes unreliable), when a precise LDL is needed for a treatment decision, or when a triglyceride disorder is being diagnosed.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.