HDL precipitation requires triglyceride levels to be below what value for efficiency?

• A. Less than 400 mg/dL
• B. Less than 600 mg/dL
• C. Less than 200 mg/dL
• D. Less than 1000 mg/dL

Answer: (A)

HDL precipitation methods work best when the plasma isn’t heavily lipemic. The procedure uses reagents to precipitate non-HDL lipoproteins (like VLDL and chylomicrons) so that HDL remains in the supernatant for measurement. When triglyceride levels are high, there are many more VLDL and chylomicrons, which increases turbidity and can interfere with the precipitation process. This makes it harder to completely remove non-HDL particles or can even cause partial loss of HDL in the precipitate, leading to inaccurate HDL-Cholesterol results. Keeping triglycerides below this cutoff minimizes interference and allows the precipitation to separate HDL cleanly. Therefore, best efficiency is achieved when triglyceride levels are below 400 mg/dL.