What is the monocyte/HDL ratio?
The monocyte/HDL ratio (MHR) is your monocyte count (×10⁹/L) divided by your HDL cholesterol (mmol/L). Both numbers come from tests already in your Baseline: monocytes from the full blood count and HDL from the lipid panel. The ratio needs no extra blood, and labs don't usually report it. We calculate it for you.
Monocytes are white blood cells that move from the blood into tissues, including artery walls, where they become macrophages and drive inflammation. HDL cholesterol works in the other direction: it carries excess cholesterol out of tissues and helps keep monocytes in check. The ratio puts the two side by side, so a higher number means more inflammatory cells relative to the cholesterol that protects against them.
Why the monocyte/HDL ratio matters
MHR matters because inflammation and cholesterol work together in the build-up of plaque in arteries, and the ratio captures both in one number. A 2018 review in the Journal of Cellular Physiology looked at MHR as a marker of heart and blood vessel disease, and found higher values linked with plaque, coronary disease and cardiovascular events in a range of studies (Ganjali et al., 2018).
It also shows up in metabolic health. In a study of more than 10,000 US adults, the average MHR was 0.42, and people above about 0.51 had noticeably higher odds of type 2 diabetes (Yu et al., 2025). Most of this research is observational, so the ratio points to a pattern worth watching. It does not diagnose anything on its own.
Because it is calculated from two everyday markers, MHR is most useful as a trend. A ratio that creeps up over a few retests tells you more than one reading.
Monocyte/HDL ratio normal range
There is no standard Australian lab reference range for MHR, because pathology labs don't report it. Vively uses a range of 0.17 to 0.7 for men and 0.13 to 0.5 for women.
| Range |
|---|
| Vively range, men | 0.17 to 0.7 |
| Vively range, women | 0.13 to 0.5 |
| Lab reference range | Not reported by Australian labs |
The ratio is a count divided by a concentration, so you can read it as a plain number. Studies use different units for HDL (mmol/L or mg/dL), so numbers you read online may be on a different scale. Your result in the Vively app always uses Australian units. Women usually sit lower than men because they tend to have higher HDL.
What does a high monocyte/HDL ratio mean?
A high MHR means your monocyte count is high, your HDL is low, or both. Low HDL is the more common driver, and it often travels with insulin resistance.
Everyday reasons the ratio rises:
- A recent infection or illness. Monocytes stay raised for a while during recovery from a virus or bacterial infection.
- Low HDL from inactivity, smoking or carrying weight around the middle.
- High triglycerides and insulin resistance, which pull HDL down.
- A diet high in refined carbohydrates and sugary drinks, which tends to lower HDL and raise triglycerides.
- Testosterone or anabolic steroid use, which can lower HDL noticeably.
Medical causes a doctor will think about:
- Ongoing inflammatory conditions, such as inflammatory bowel disease or rheumatoid arthritis, which can raise monocytes.
- Type 2 diabetes and prediabetes, often with low HDL.
- Chronic kidney disease, where a higher MHR has been linked with more cardiovascular events (Kanbay et al., 2014).
- Blood disorders, which are uncommon but can cause a persistently high monocyte count.
One high reading a few weeks after a bad cold is usually not a concern. A ratio that stays high across retests, especially with low HDL, is worth acting on.
What does a low monocyte/HDL ratio mean?
A low MHR is generally a good sign and doesn't need treatment. It usually means healthy HDL with a normal monocyte count.
It is rarely meaningful on its own. A very low monocyte count can follow steroid medicines or, less often, a bone marrow problem, and your full blood count will show this directly.
What can affect your monocyte/HDL ratio result
Do you need to fast? Not for the ratio itself. Monocytes and HDL barely change after a meal. You'll fast for the Baseline anyway, because it includes fasting glucose and insulin.
Things that can shift your result:
- Recent illness or vaccination can raise monocytes for a few weeks. If you've been unwell, it can be worth waiting until you've recovered.
- Hard exercise in the day or two before your test can briefly change white cell counts.
- Alcohol raises HDL, which can make the ratio look better than your overall health picture.
- Steroid medicines lower monocytes, and testosterone lowers HDL.
- Normal variation. Both numbers move a little between tests, so look at the trend.
How the monocyte/HDL ratio fits with your other results
MHR is a summary. The markers it is built from, and the ones around it, show what is driving it.
| Pattern | What it can mean |
|---|
| High MHR, high monocytes, normal HDL | Immune activity is the driver, often a recent infection. Recheck once you're well. |
| High MHR, low HDL, high triglycerides | A typical insulin resistance pattern. Worth checking fasting insulin and HOMA-IR. |
| High MHR with raised hs-CRP | Low-grade inflammation is likely. Look at sleep, weight around the middle and smoking first. |
| High MHR and a high neutrophil/HDL ratio | Low HDL is the shared driver. Raising HDL will move both. |
| Normal MHR, high LDL | MHR doesn't capture cholesterol load. Your LDL still needs attention. |
How to support a healthy monocyte/HDL ratio
Most of the change comes from the HDL side, and lifestyle moves it more than for most cholesterol markers.
- Move most days. Aerobic exercise and strength training both raise HDL modestly. Aim for at least 150 minutes a week.
- If you smoke, stopping raises HDL, often within the first year.
- Cut back on refined carbohydrates, sugary drinks and alcohol if your triglycerides are high. This is where HDL often improves fastest.
- Swap saturated fats for unsaturated ones. Cook with olive oil, and choose nuts, seeds, avocado and oily fish.
- Try to reduce weight around the middle if you carry it there. Even a small loss can lift HDL and lower inflammation.
- Look after sleep and recovery, especially if you train hard, so white cell counts can settle.
When to see your GP
Doctors don't use MHR to make decisions, so base a GP visit on the markers behind it.
See your GP if your monocyte count stays high on repeat tests, or if a high count comes with fever, night sweats, unexplained weight loss or ongoing tiredness. Book in too if your HDL is below 1.0 mmol/L with other heart risk factors, such as high blood pressure, smoking, diabetes or a family history of early heart disease. Chest pain, pressure or shortness of breath is never something to wait on: call 000.
Testing your monocyte/HDL ratio with Vively
Your monocyte/HDL ratio is included in Vively's Baseline Health Check, calculated from the monocyte count in your full blood count and the HDL in your lipid panel. There's nothing extra to order.
We arrange your referral through our GP network, and you have one blood draw at one of 4,000+ accredited partner collection centres. Results arrive in the app, usually within a few days, read against optimal ranges. Your practitioner talks you through what is behind your ratio, we build a personalised plan, and you retest to see your numbers move. Exact markers can depend on the referring doctor's review.
Check your monocyte/HDL ratio with the Baseline Health Check.
Frequently asked questions
Do I need to fast before a monocyte/HDL ratio test?
No, the ratio itself isn't affected by food. Monocytes and HDL change very little after a meal. Vively's Baseline includes fasting glucose and insulin, so you'll fast for 8 to 12 hours before your blood draw anyway, with water only.
Is the monocyte/HDL ratio a standard blood test?
No. It is a calculated marker used mostly in research. We work it out from your monocyte count and HDL cholesterol, two standard results, so you can follow the trend. Your GP will look at those two markers directly.
Is a monocyte/HDL ratio of 0.6 high?
It depends on your sex. For men, 0.6 is inside the Vively range of 0.17 to 0.7. For women, it is above the Vively range of 0.13 to 0.5. Either way, check whether a recent illness or low HDL is behind it, and retest before drawing conclusions.
What is the difference between the monocyte/HDL and neutrophil/HDL ratios?
Both compare a type of white blood cell with HDL cholesterol. Monocytes are the cells most closely tied to plaque in artery walls, while neutrophils respond fastest to infection and stress. If both ratios are high, low HDL is usually the common thread.
Can I get this test through Medicare?
Many blood tests can be Medicare-funded when a doctor orders them for a clinical reason. With Vively, we arrange the referral through our GP network as part of your Baseline Health Check, and the ratio is calculated from markers already in it.
How often should I retest my monocyte/HDL ratio?
Every three to six months is enough to see a trend. HDL changes slowly, so give lifestyle changes at least three months before you retest. If your monocytes were high because of a recent illness, retest once you've fully recovered.
References
- Ganjali S, Gotto AM, Ruscica M, et al. Monocyte-to-HDL-cholesterol ratio as a prognostic marker in cardiovascular diseases. Journal of Cellular Physiology. 2018;233(12). doi:10.1002/jcp.27028
- Kanbay M, et al. Monocyte count/HDL cholesterol ratio and cardiovascular events in patients with chronic kidney disease. International Urology and Nephrology. 2014.
- Yu H, Yang C, Lv J, et al. The association between monocyte-to-high-density lipoprotein cholesterol ratio and type 2 diabetes mellitus: a cross-sectional study. Frontiers in Medicine. 2025;12. https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1521342/full
- Pathology Tests Explained. Full blood count. https://www.pathologytestsexplained.org.au
- Healthdirect Australia. Full blood count. https://www.healthdirect.gov.au/full-blood-count
- Heart Foundation. Blood cholesterol. https://www.heartfoundation.org.au
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