Total cholesterol is 300, LDL is 25mg/dl TG is 150 mg/dl. What would be HDL?
**Core Concept**
The question is testing the calculation of HDL (High-Density Lipoprotein) cholesterol based on the given values of total cholesterol, LDL (Low-Density Lipoprotein) cholesterol, and triglycerides (TG). This calculation is essential in assessing cardiovascular risk and determining the effectiveness of lipid-lowering therapies.
**Why the Correct Answer is Right**
To calculate HDL, we can use the Friedewald equation: HDL = Total Cholesterol - LDL - (TG/5). Plugging in the given values, we get HDL = 300 - 25 - (150/5) = 300 - 25 - 30 = 245 mg/dl. This equation is based on the principle that HDL is the cholesterol that is not bound to LDL or triglycerides in the blood.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
When calculating HDL using the Friedewald equation, it is essential to note that the equation is valid only when TG levels are below 400 mg/dl. Elevated TG levels can lead to inaccurate HDL calculations.
**Correct Answer:** D. 245 mg/dl.