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High Triglycerides with a Low HDL

By the Prismo editorial team Medically reviewed by Dr. Jonathan Reynolds Reviewed 24 August 2026 4 min read

These two move as a pair because they are produced by the same underlying process, and that process is insulin resistance. The LDL sitting between them often looks acceptable, which is why this combination gets passed over. It should not be: the risk it represents is real and largely invisible on the number most people read first.

The pattern on your report

  • Triglycerides High · moderate Key
  • HDL Low · mild Key
  • LDL Normal Key
  • HbA1c High-normal Supporting

Printed as: HDL in mmol/Lor mg/dL— 1.0 mmol/L is about 39 mg/dL.HbA1c in mmol/molor %— Not a simple multiplication: (mmol/mol divided by 10.929) plus 2.15.LDL in mmol/Lor mg/dLTriglycerides in mmol/Lor mg/dL— 1.7 mmol/L is about 151 mg/dL. Triglycerides and cholesterol use different conversion factors.

Why the numbers look like this

When the liver is handling more fat and sugar than it can process cleanly, it exports triglyceride-rich particles. Those particles then trade with the others: they hand triglyceride to LDL and HDL, and take cholesterol in return.

That exchange does two things at once, and they compound. HDL particles loaded with triglyceride are cleared faster, so the HDL level falls. LDL particles end up smaller and cholesterol-depleted, so the LDL number stays unremarkable while the number of particles rises.

So the pair travels together, and the LDL misleads. One process produces all three effects. A standard panel shows two of them.

Not being flagged is not the same as normal

Triglyceride limits print near 1.7 mmol/L, or 150 mg/dL, and HDL floors near 1.0 for men and 1.2 for women. Triglycerides also move more than any other lipid with what you ate, so a non-fasting sample can read substantially higher than a fasting one. That variability is real information rather than noise, since after-meal levels track risk too, but it does mean a single raised value deserves a repeat before it becomes a diagnosis.

What else on the report can hide this

Use non-HDL cholesterol here in place of LDL. It needs no extra test. It captures the remnant particles that this process generates and that LDL leaves out.

HbA1c, waist circumference and blood pressure complete the picture, because this lipid pattern is one component of a cluster and treating it in isolation misses the point. Liver enzymes belong there too: metabolic fat in the liver produces the same lipid signature and a mildly raised ALT alongside is a common finding.

Alcohol deserves asking about specifically, since it raises triglycerides and HDL simultaneously, which can partly mask the pattern. And check the TSH, because an underactive thyroid raises triglycerides and is correctable.

What usually causes it

Listed from most to least common — not from most to least serious.

  1. Very common

    Insulin resistance and central weight gain

    The dominant cause. A larger waist, a rising HbA1c, and blood pressure creeping up. The lipid pattern is one symptom of it.

  2. Very common

    Metabolic fat in the liver

    Produces the same signature, often with a mildly raised ALT or GGT. The two conditions overlap so heavily that they are usually the same story.

  3. Common

    A non-fasting sample

    Triglycerides rise substantially after eating. Worth establishing before treating a single result as a finding.

  4. Common

    Alcohol

    Raises triglycerides reliably, and raises HDL at the same time, so it can flatten the pattern while worsening one half of it.

  5. Common

    Type 2 diabetes

    This is the characteristic lipid pattern of diabetes, and it is why non-HDL or ApoB is preferred over LDL for monitoring.

  6. Common

    Medications

    Thiazides, beta blockers, corticosteroids, estrogens, isotretinoin and some antipsychotics all raise triglycerides.

  7. Uncommon

    Hypothyroidism

    Raises triglycerides and LDL, and treating the thyroid can resolve the lipid picture without a lipid drug.

  8. Uncommon

    Chronic kidney disease

    Produces this pattern independently of body weight. Check the eGFR and a urine ACR.

  9. Uncommon

    Familial combined hyperlipidemia

    An inherited pattern with a strong family history of early cardiovascular disease and lipids that vary between relatives and over time.

What is usually checked next

  • Non-HDL cholesterol from the existing panel Counts the remnant particles this process produces, which is what the LDL is failing to represent.
  • HbA1c, waist measurement and blood pressure Identifies the cluster the lipids belong to, and those findings drive the treatment far more than the triglyceride number does.
  • A repeat fasting sample Separates a post-meal reading from a persistently raised level, which matters before anything is started.
  • TSH, liver panel and kidney function with a urine ACR Covers the three secondary causes that are correctable in their own right.
  • ApoB where available Measures particle number directly, which is the quantity that carries the risk in this pattern.

When to seek care sooner

  • Emergency Severe abdominal pain radiating to the back, with vomiting
  • Same day A triglyceride result above about 10 mmol/L (900 mg/dL)
  • Same day Chest pain or tightness on exertion
  • Soon Yellowish bumps on the skin of the elbows, knees or buttocks
  • Soon A close relative who had a heart attack or stroke before 60

Questions worth bringing to your appointment

  1. What is my non-HDL cholesterol, and should we be treating to that instead of LDL?
  2. Was this sample fasting?
  3. Have my HbA1c, waist and blood pressure been looked at together with this?
  4. Could my thyroid, kidneys or any of my medicines be contributing?
  5. How much does my alcohol intake matter here?

More from this panel

How to read a cholesterol panel →

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