You get a blood test back, and one line reads “fasting insulin: 14.” The reference chart beside it looks vague, and suddenly that number above 10 feels alarming. Many Malaysian women with PCOS go through this exact moment, usually after a private-lab test, then wonder whether they now “have an insulin problem.” This article explains what fasting insulin actually is, why a reading above 10 is often read as an early sign of insulin resistance, and, more importantly, why you should not draw conclusions from a single reading.

One thing should be clear from the start: fasting insulin is a rough indicator, not a definitive diagnostic test for PCOS. It offers a snapshot, but its interpretation varies between labs and shifts from one day to the next. To understand how insulin connects to PCOS overall, start with our insulin resistance guide first.

What fasting insulin is and why it gets measured

Insulin is a hormone the pancreas releases to help cells take up sugar from the blood. When muscle, liver and fat cells start responding less, a state called insulin resistance, the pancreas has to pump out more insulin to keep blood sugar in the normal range. So your blood sugar may still look fine while insulin levels are already climbing behind the scenes. That is why some doctors measure fasting insulin: it can sometimes catch an early sign before blood sugar changes.

In PCOS, insulin resistance is one of the main drivers for many women. High insulin pushes the ovaries to make more testosterone, disrupts periods, interferes with ovulation, and makes weight loss harder. The test is taken after an 8 to 12 hour fast (plain water is allowed), because a post-meal value is meaningless for this purpose.

What it means if fasting insulin is above 10

This is the part that confuses people, because the lab “normal” range is very wide. Most labs print a broad reference range, typically around 2.6 to 25 µIU/mL (this unit is the same as mIU/L). If you only look at that chart, a reading of 14 looks “within normal” and nothing to worry about.

However, many metabolic-health practitioners use a tighter target for practical purposes:

  • Below 8 µIU/mL: generally good insulin sensitivity.
  • 8 to 10 µIU/mL: a borderline zone worth watching.
  • Above 10 µIU/mL: often read as a sign of moderate insulin resistance.

So a number above 10 is a soft signal, not a diagnosis. It suggests your pancreas may be working harder than it should, which fits the pattern commonly seen in PCOS. But note this: the “optimal” 8 to 10 range is a clinical convention, not a hard line agreed worldwide. An experienced doctor reads this number alongside your weight, waist measurement, symptoms and blood-sugar results, not in isolation.

Why a single insulin reading cannot be taken at face value

There are honest technical reasons you should know, because they explain why specialists do not lean heavily on this number:

  • Insulin assays are not standardised between labs. Different kits give different readings, so a fasting insulin of 14 at Lab A cannot be compared directly with an 11 at Lab B. If you want to track change, repeat the test at the same lab.
  • A single reading fluctuates. Insulin is sensitive to sleep, stress, and what you ate the day before, so one high number on one day may not hold.
  • It is not an official diagnostic screening test. Fasting insulin also feeds the HOMA-IR calculation, an estimate of insulin resistance. If your report also lists HOMA-IR, learn to read it correctly in our HOMA-IR: how to calculate guide.

This is why the international PCOS guideline (Monash, ESHRE and ASRM 2023, aligned with the Endocrine Society position) does not recommend fasting insulin or HOMA-IR as a routine screen. Instead, the oral glucose tolerance test (OGTT) and HbA1c are preferred because they are more reliable and standardised. See our guide on the OGTT for PCOS to understand the tests clinics actually prioritise.

Malaysian context: where, and whether you even need this test

In government clinics, fasting insulin is usually not a routine test. Klinik Kesihatan KKM (RM1 for citizens, specialist follow-up around RM5) typically screens metabolic risk using fasting glucose, HbA1c or OGTT, the very tests the guideline recommends. To get fasting insulin separately, most women go to a private lab or clinic, and the cost varies between providers, so check the current price first.

So do you need this test? For most women with PCOS, OGTT and HbA1c are enough to assess blood-sugar risk, and both are available in government clinics at low cost. Fasting insulin can be interesting extra information, but it is not essential, and it should not replace the sturdier tests. If you are newly diagnosed and unsure which tests to do first, our newly diagnosed guide lays out the early steps clearly.

What to do after you see this number

Whether your fasting insulin is 9 or 16, the basic action is much the same, because the focus of PCOS care is improving insulin sensitivity, not chasing one number on a report. The things proven to help (strong evidence for the basics) include daily movement and resistance exercise, enough sleep, lower-glycaemic-index eating such as choosing brown rice or adding vegetables and protein to your plate, and modest weight loss where relevant.

Some women also consider supplements after talking to their doctor. Berberine, for example, was studied in a trial of women with PCOS at a dose of 500 mg three times a day for three months, and it lowered fasting insulin and HOMA-IR compared with placebo, with effects comparable to metformin on some measures. Even so, the evidence is still limited to small studies. Treat that figure as the dose used in studies, not a prescription, and discuss it with your doctor first, because berberine can interact with other medicines, is not recommended in pregnancy or breastfeeding, and you should check the product’s halal status and NPRA registration.

When should you see a doctor promptly? If you have diabetes-type symptoms such as frequent thirst, frequent urination, unusual fatigue or unexpected weight loss, do not wait for any insulin test; get a proper blood-sugar assessment now. Remember too that PCOS raises the long-term risk of type 2 diabetes and heart disease, something many Malaysian women are not yet aware of, so periodic metabolic monitoring is worthwhile even when today’s insulin looks fine. For the bigger picture of the condition, see our what is PCOS guide.