Cholesterol Level Checker
Track your cholesterol levels according to National Heart, Lung, and Blood Institute guidelines. Understand your cardiovascular risk.
Understanding Cholesterol
Total cholesterol is calculated using the Friedewald equation:
According to NHLBI guidelines, total cholesterol categories are:
- Desirable: <200 mg/dL
- Borderline High: 200-239 mg/dL
- High: ≥240 mg/dL
Check Your Lipid Profile
Measurement Guide
Preparation: Fast for 9-12 hours before testing for accurate triglyceride levels.
Normal: LDL <100, HDL ≥40 (men) or ≥50 (women), Triglycerides <150 mg/dL
Cholesterol Level Scale
Reading Interpretation
Cholesterol Benchmarks
Cholesterol Analysis & Recommendations
Your total cholesterol of 180 mg/dL is categorized as Desirable.
- Maintain your healthy cholesterol levels with a balanced diet
- Include regular physical activity in your routine
- Limit saturated and trans fats in your diet
- Monitor your cholesterol levels every 4-6 years
Understanding Cholesterol
Cholesterol is a waxy substance found in your blood. While your body needs cholesterol to build healthy cells, high levels can increase your risk of heart disease. The total cholesterol level is calculated using the Friedewald equation.
According to the National Heart, Lung, and Blood Institute, total cholesterol categories for adults are:
- Desirable: Less than 200 mg/dL
- Borderline High: 200-239 mg/dL
- High: 240 mg/dL or higher
The Friedewald equation: Total Cholesterol = LDL + HDL + (Triglycerides ÷ 5)
- Cholesterol testing requires fasting for 9-12 hours for accurate triglyceride measurement
- LDL ("bad") cholesterol contributes to plaque buildup in arteries
- HDL ("good") cholesterol helps remove LDL from arteries
- High triglycerides increase cardiovascular risk independently
- Cholesterol levels may vary based on diet, exercise, and medications
Test Your Knowledge
According to NHLBI guidelines, what is the definition of "Desirable" total cholesterol?
Correct Answer: b) <200 mg/dL
According to the National Heart, Lung, and Blood Institute, desirable total cholesterol is less than 200 mg/dL.
The NHLBI guidelines emphasize that total cholesterol below 200 mg/dL indicates a lower risk of cardiovascular disease.
If LDL is 120 mg/dL, HDL is 45 mg/dL, and triglycerides are 150 mg/dL, what is the total cholesterol?
Total Cholesterol = LDL + HDL + (Triglycerides ÷ 5) = 120 + 45 + (150 ÷ 5) = 120 + 45 + 30 = 195 mg/dL
The total cholesterol is 195 mg/dL, which falls in the desirable range.
Using the Friedewald equation: Total = LDL + HDL + (Triglycerides ÷ 5). Divide triglycerides by 5 to convert to cholesterol equivalents.
A patient has LDL of 140 mg/dL, HDL of 35 mg/dL, and triglycerides of 200 mg/dL. What is their total cholesterol category?
Total Cholesterol = 140 + 35 + (200 ÷ 5) = 140 + 35 + 40 = 215 mg/dL
This falls in the "Borderline High" category (200-239 mg/dL), indicating increased cardiovascular risk.
This patient has multiple lipid abnormalities: high LDL, low HDL, and elevated triglycerides, all contributing to cardiovascular risk.
Why should patients fast before a lipid panel?
Correct Answer: b) To accurately measure triglycerides
Food intake significantly affects triglyceride levels, so fasting ensures accurate measurement for the Friedewald calculation.
Fasting for 9-12 hours before testing ensures accurate triglyceride measurement, which is critical for calculating total cholesterol and assessing cardiovascular risk.
Which lipoprotein is known as "good cholesterol" and helps protect against heart disease?
Correct Answer: c) HDL
HDL (high-density lipoprotein) is known as "good cholesterol" because it helps transport cholesterol away from arteries to the liver for excretion.
- Desirable: <200 mg/dL
- Borderline High: 200-239 mg/dL
- High: ≥240 mg/dL
- Measure lipids after 9-12 hour fast for accuracy
- Repeat abnormal values before treatment decisions
- Consider calculated LDL if triglycerides <400 mg/dL
- Assess overall cardiovascular risk, not just cholesterol
- Testing without proper fasting requirements
- Not considering medications affecting lipids
- Using Friedewald equation when triglycerides >400 mg/dL
- Ignoring non-lipid cardiovascular risk factors
Medical Q&A
Q: What's the difference between LDL and HDL cholesterol?
A: The main differences are:
LDL (Low-Density Lipoprotein):
- Name: Known as "bad" cholesterol
- Function: Transports cholesterol to tissues
- Effect: Contributes to arterial plaque formation
- Target: Lower is better, ideally <100 mg/dL
HDL (High-Density Lipoprotein):
- Name: Known as "good" cholesterol
- Function: Removes cholesterol from arteries to liver
- Effect: Protective against cardiovascular disease
- Target: Higher is better, ideally >40 mg/dL (men), >50 mg/dL (women)
The balance between LDL and HDL is crucial for cardiovascular health.
Q: How often should cholesterol levels be checked?
A: The frequency depends on risk factors:
General Population:
- Ages 20-39: Every 4-6 years if low risk
- Ages 40+: Annually or as recommended by physician
- High-risk individuals: More frequent monitoring
- On statins: Every 3-12 months initially
Increased Frequency Needed For:
- Diabetes: Annual monitoring
- Heart disease: Every 3-6 months
- Family history: As determined by physician
- Medication changes: Follow-up as directed
Individual risk factors and medications influence the optimal monitoring schedule.