In a diabetes clinic the LDL cholesterol on the report is usually calculated, not measured, and the calculation becomes unreliable exactly where your patients live: raised triglycerides, non-fasting samples, low HDL. Non-HDL cholesterol sidesteps all of it. It is total cholesterol minus HDL cholesterol - arithmetic you can do at the desk on any report, fasting or not, and it captures every atherogenic particle rather than one of them.
The target is simple: 30 mg/dL above whatever LDL goal you are working to. If the goal is an LDL under 70 mg/dL, non-HDL should be under 100 mg/dL. If the goal is an LDL under 55 mg/dL for someone at high risk, non-HDL should be under 85 mg/dL.
This is worth making a habit in Indian practice specifically. The pattern here - moderately raised triglycerides, low HDL, small dense LDL particles - produces a reassuring calculated LDL alongside a genuinely raised burden of atherogenic particles. Treating to LDL alone in that patient systematically undertreats. The care sequence is short: non-fasting lipid profile -> calculate non-HDL at the desk -> compare against the LDL goal plus 30 -> intensify the statin or add ezetimibe if above -> recheck at 8 to 12 weeks.
- Calculate non-HDL on every lipid report: total cholesterol minus HDL cholesterol
- Set the target as the LDL goal plus 30 mg/dL - under 100 mg/dL for most, under 85 mg/dL for high risk
- Stop insisting on fasting samples for routine lipid monitoring; non-HDL is valid non-fasting
- Treat a calculated LDL at goal alongside a non-HDL above goal as undertreatment, not as a discrepancy to ignore
- Where triglycerides are above about 400 mg/dL, the calculated LDL should not be used at all - non-HDL is the only usable number on that report
The statistics, in plain English
The 30 mg/dL offset is not arbitrary. Non-HDL includes the cholesterol carried in triglyceride-rich lipoproteins as well as in LDL, and at a triglyceride level around the upper limit of normal that extra fraction comes to roughly 30 mg/dL - so adding 30 to the LDL goal keeps the two targets equivalent in risk terms. The reason calculated LDL fails at high triglycerides is that the Friedewald equation estimates that same fraction as the triglyceride level divided by five, an assumption that breaks down as triglycerides rise and produces a falsely low LDL. Non-HDL requires no such assumption, which is why it stays valid in a non-fasting sample.
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