LDL Calculated Blood Test

Friedewald Equation:

\[ LDL-C = TC - HDL-C - \frac{TG}{5} \]

Calculated LDL Cholesterol (LDL-C):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is an LDL Calculated Blood Test?

The LDL calculated blood test uses the Friedewald equation to estimate LDL cholesterol levels from total cholesterol, HDL cholesterol, and triglyceride measurements. It provides an indirect assessment of LDL cholesterol without requiring direct measurement.

2. How Does the Calculator Work?

The calculator uses the Friedewald equation:

\[ LDL-C = TC - HDL-C - \frac{TG}{5} \]

Where:

\( LDL-C \) — Low-density lipoprotein cholesterol (mg/dL)
\( TC \) — Total cholesterol (mg/dL)
\( HDL-C \) — High-density lipoprotein cholesterol (mg/dL)
\( TG \) — Triglycerides (mg/dL)

Explanation: The equation estimates LDL cholesterol by subtracting HDL cholesterol and one-fifth of triglycerides from total cholesterol.

3. Importance of LDL Calculation

Details: LDL cholesterol calculation is crucial for assessing cardiovascular risk, guiding cholesterol management strategies, and monitoring the effectiveness of lipid-lowering therapies.

4. Using the Calculator

Tips: Enter total cholesterol, HDL cholesterol, and triglycerides in mg/dL. All values must be valid (greater than 0). Note: This calculation is not valid when triglyceride levels exceed 400 mg/dL.

5. Frequently Asked Questions (FAQ)

Q1: Why use calculated LDL instead of direct measurement?
A: Calculated LDL is more cost-effective and widely available, while direct measurement may be preferred when triglycerides are very high (>400 mg/dL).

Q2: What are optimal LDL cholesterol levels?
A: Optimal LDL is generally <100 mg/dL, though targets may vary based on individual cardiovascular risk factors.

Q3: When should lipid testing be performed?
A: Fasting for 9-12 hours is recommended for accurate triglyceride measurement, which affects LDL calculation.

Q4: Are there limitations to the Friedewald equation?
A: The equation becomes less accurate when triglyceride levels exceed 400 mg/dL and may underestimate LDL in certain populations.

Q5: How often should LDL be monitored?
A: Monitoring frequency depends on individual risk factors, treatment status, and clinical guidelines, typically every 3-12 months.