The South Asian Lab Reference Range Problem (And the 5 Numbers Worth Questioning)
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You did everything right. You showed up, got the bloodwork, waited for the call. Your doctor smiled and said everything looks normal. And you walked out relieved, but also quietly confused, because you are wiped out by 3pm, gaining weight you cannot explain, and foggy in a way that does not feel like just getting older.
Here is what almost no one tells you: the "normal" range your results were compared to was probably not built with a body like yours in mind.
I started a new South Asian women's health series on Endocrine Matters with exactly this problem. You can watch or listen on my channel.
"Normal" Is Not the Same as Built for You
When your blood is drawn, the results come back measured against a reference range. For a long time, those ranges were built largely from studies of white, Western populations. So the numbers we treat as universal were calibrated on a very specific someone, and that someone was not a South Asian woman.
This is not a conspiracy. It is a gap in the science. But it has real consequences.
The Truth: Our Bodies Carry Risk Differently
The MASALA study, the largest long-term study of South Asian Americans and cardiometabolic risk, found something striking. South Asian women had a type 2 diabetes rate more than four times higher than white women, at the same ages and the same BMIs.
The overgeneralization says a "normal" BMI and a "normal" panel mean you are in the clear. The truth is that South Asians carry more visceral fat, more liver fat, and less muscle at the same weight, so risk shows up earlier and at lower numbers than the standard ranges assume.
The 5 Numbers Worth Questioning
BMI. Ask your doctor to use the Asian-specific cutoffs: 23 for overweight, 27.5 for obesity, not the standard 25 and 30.
Waist circumference. The South Asian threshold is around 80cm, not the standard 88cm. That gap alone can change whether you look "fine" on paper.
HbA1c. South Asians tend to develop diabetes earlier and progress faster. If yours sits between 5.7 and 6.0, ask whether you should act sooner.
Cholesterol. "Normal" LDL can hide smaller, denser, more dangerous particles. Ask about triglycerides and HDL, not just LDL.
Cardiovascular risk. The standard risk calculator was not validated in South Asians and may underestimate you. Ask whether your ancestry is being weighted, and whether a coronary artery calcium score would give a clearer picture.
What to Actually Say at Your Appointment
You do not need to memorize the science. You need a short script. Bring the 5 Numbers you want to question, ask them plainly, and pay attention to the answers. If your doctor looks at you blankly, that is information too. It may be telling you something about whether this is the right provider for your specific body.
The Bottom Line
The fact that your numbers fall in the "normal" range does not mean you are not at risk. It means the system has not caught up with the science yet.
You are not a data point built for someone else's body. Normal is not the same as optimal, and you deserve a physician who knows the difference.
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FAQs
What is the MASALA study? It is the first and largest long-term study of South Asian Americans and cardiovascular risk, launched by researchers at UCSF and Northwestern. It is the basis for much of what we now understand about how South Asian bodies carry cardiometabolic risk differently.
Why are there different BMI cutoffs for South Asians? Because at the same BMI, South Asians tend to carry more visceral and liver fat and less muscle, which raises risk earlier. The WHO, ADA, and AHA all recommend lower cutoffs (overweight at 23, obesity at 27.5) for Asian populations.
My labs are "normal." Could I still be at risk? Yes. Normal means inside a range built largely on other populations. For South Asian women, meaningful risk can exist while every number still reads as fine.
What should I actually ask my doctor? Ask them to apply the Asian BMI and waist cutoffs, to consider earlier diabetes screening, to look at triglycerides and HDL rather than just LDL, and whether your ancestry is being counted as a cardiovascular risk factor.
Do I need to be a certain age for this to matter? No, but it matters more with time. South Asian women develop metabolic risk earlier, so these conversations are worth having in your 30s and 40s, not only later.
Is this saying my doctor is doing something wrong? Not necessarily. Many clinicians simply have not been trained on ethnicity-specific ranges. The goal is to walk in informed and ask the right questions so your care reflects your actual body.
