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Objective . To determine if non-HDL cholesterol (N-HDL) and directly measured LDL cholesterol (D-LDL) are clinically equivalent measurements.  Patients and Methods . Eighty-one subjects recruited for 2 cholesterol treatment studies had at least 1 complete fasting lipid panel and D-LDL performed simultaneously; 64 had a second assessment after 4 to 6 weeks, resulting in 145 triads of C-LDL, D-LDL, and N-HDL. To directly compare N-HDL to D-LDL and C-LDL, we normalized the N-HDL by subtracting 30 from the N-HDL (N-HDL A ).  Results . There was significant correlation between N-HDL A , D-LDL, and C-LDL. Correlation was significantly greater between N-HDL A  and C-LDL than between N-HDL A  and D-LDL. A greater than 20 mg/dL difference between measures was observed more commonly between N-HDL A  and D-LDL, 29%, than between C-LDL and N-HDL A , 11% ( P  < 0.001), and C-LDL and D-LDL, 17% ( P  = 0.028). Clinical discordance was most common, and concordance was least common between N-HDL and D-LDL.  Conclusions . Our findings suggest that N-HDL cholesterol and D-LDL cholesterol are not clinically equivalent and frequently discordant. As N-HDL may be superior to even C-LDL for predicting events in statin-treated patients, utilizing N-HDL to guide therapy would appear to be preferable to D-LDL when C-LDL is inaccurate.

Discordance of Non-HDL and Directly Measured LDL Cholesterol: Which Lipid Measure is Preferred When Calculated LDL Is Inaccurate?