HOMA2-%S (Insulin Sensitivity) Biomarker Testing
HOMA2-%S estimates your insulin sensitivity from fasting glucose and insulin to flag insulin resistance early, with Quest labs and PocketMD support.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
HOMA2-%S is a calculated marker that estimates how sensitive your body is to insulin. It reports insulin sensitivity as a percentage relative to a reference population, so higher numbers generally mean insulin is working more effectively to keep blood glucose in range.
Because it is derived from fasting glucose and fasting insulin, HOMA2-%S can reveal early metabolic patterns that you might not see on glucose alone. It is especially useful when you are trying to understand weight changes, energy issues, or cardiometabolic risk factors in a more connected way.
Your result is one piece of the picture. It can support clinician-directed decisions and follow-up testing, but it cannot diagnose a condition by itself.
Do I need a HOMA2-%S test?
You may consider HOMA2-%S testing if you have signs that often travel with low insulin sensitivity, such as weight gain around your midsection, fatigue, difficulty losing weight, elevated triglycerides, low HDL cholesterol, or rising blood pressure.
It can also be helpful if your fasting glucose is “normal” but you suspect your body is compensating by producing more insulin, or if you are tracking metabolic health changes over time with lifestyle adjustments.
HOMA2-%S is most informative when it is interpreted alongside related markers like fasting insulin, fasting glucose, and longer-term glucose measures. If you are pregnant, have known diabetes, or are taking glucose-lowering medications, you should review the timing and interpretation with a clinician because those factors can change what the number means.
HOMA2-%S is a derived index calculated from fasting glucose and fasting insulin using the HOMA2 model; it supports risk assessment and monitoring but is not a standalone diagnosis.
Lab testing
Order labs that include fasting glucose and fasting insulin to calculate HOMA2-%S.
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
With Vitals Vault, you can order labs that include the inputs needed to calculate HOMA2-%S and then review your results in a clear, practical format. This is useful when you want to move from “I feel off” to “I can see what my metabolism is doing” without guessing.
After your blood draw, you can use PocketMD to ask questions about what your HOMA2-%S suggests, what other labs can confirm the pattern, and what changes are most likely to move the needle for you. If you are trending results, PocketMD can also help you think through whether a change is meaningful or just normal variability.
If your results point toward lower insulin sensitivity, you can use them to guide a focused conversation with your clinician about next steps, which may include nutrition, activity, sleep, weight management, or medication decisions when appropriate.
- Order labs and complete your draw through the Quest network
- PocketMD support to help you interpret results in context
- Designed for trending over time, not one-off snapshots
Key benefits of HOMA2-%S testing
- Estimates insulin sensitivity from fasting glucose and fasting insulin in one interpretable percentage.
- Can flag insulin resistance patterns even when fasting glucose still looks “normal.”
- Helps separate low insulin sensitivity from other causes of elevated glucose, such as reduced beta cell function.
- Adds context to weight gain, fatigue, and cardiometabolic risk markers like triglycerides and HDL.
- Supports monitoring of lifestyle changes by giving you a trendable insulin-sensitivity signal.
- Improves interpretation of fasting insulin by pairing it with glucose in a validated model.
- Creates a clearer starting point for clinician discussions about next-step testing and treatment options.
What is HOMA2-%S?
HOMA2-%S is an estimate of insulin sensitivity, expressed as a percentage. Insulin sensitivity describes how effectively your cells respond to insulin’s signal to move glucose from your bloodstream into tissues for use or storage.
HOMA2-%S comes from the HOMA2 (Homeostatic Model Assessment 2) model, which uses your fasting glucose and fasting insulin to approximate how hard your body has to work to keep fasting blood sugar stable. In general, a higher HOMA2-%S suggests your body needs less insulin to maintain fasting glucose, while a lower HOMA2-%S suggests insulin resistance.
This marker is especially useful because fasting glucose alone can stay in range for years while insulin levels rise to compensate. HOMA2-%S helps you see that compensation earlier, which can be relevant for long-term metabolic and cardiovascular health.
How it differs from glucose or A1c
Fasting glucose and A1c tell you what your blood sugar is doing. HOMA2-%S adds information about how much insulin your body likely needs to achieve that glucose level. Two people can have the same fasting glucose, but very different insulin sensitivity.
How it relates to insulin resistance
Insulin resistance means your tissues respond less effectively to insulin, so your pancreas often produces more insulin to compensate. Over time, that compensation can contribute to higher triglycerides, lower HDL, higher blood pressure, and changes in waist circumference. A lower HOMA2-%S is consistent with this pattern, especially when fasting insulin is elevated.
How HOMA2-%S is calculated
Formula
HOMA2 Model (Fasting Glucose, Fasting Insulin)
HOMA2-%S is calculated by a validated mathematical model that uses your fasting glucose and fasting insulin values. The output is reported as a percentage, where higher values indicate better insulin sensitivity relative to a reference.
Because it depends on fasting inputs, the calculation is most reliable when your blood draw is done in a true fasting state and when insulin and glucose reflect your baseline physiology. Acute illness, recent intense exercise, alcohol intake, and certain medications can shift fasting insulin or glucose and change the calculated result.
What do my HOMA2-%S results mean?
Low HOMA2-%S (lower insulin sensitivity)
A low HOMA2-%S generally means your body is less sensitive to insulin, so it may require more insulin to keep fasting glucose controlled. This pattern often aligns with insulin resistance and can show up alongside weight gain, fatigue, elevated triglycerides, low HDL, or higher blood pressure. It does not tell you the cause by itself, but it can help explain why glucose may be trending upward or why you feel “stuck” despite efforts. If your fasting glucose is elevated too, your clinician may also consider whether insulin production is keeping up.
In-range HOMA2-%S (expected insulin sensitivity)
An in-range HOMA2-%S suggests your fasting glucose and insulin relationship looks consistent with typical insulin sensitivity. This is reassuring, but it is still worth looking at the full metabolic context, including triglycerides, HDL, waist circumference, blood pressure, and family history. If you have symptoms that suggest metabolic strain, you may still benefit from checking related markers or trending over time. The goal is consistency across markers, not a single “perfect” number.
High HOMA2-%S (higher insulin sensitivity)
A higher HOMA2-%S generally indicates better insulin sensitivity, meaning your body can maintain fasting glucose with relatively less insulin. This is often seen with strong metabolic fitness, lower visceral fat, and supportive sleep and activity patterns. In some cases, a high value can also reflect unusually low fasting insulin, so it is important to confirm that the insulin result is accurate and interpreted in context. If you have symptoms of low blood sugar or are on glucose-lowering therapy, discuss the result with your clinician.
Factors that influence HOMA2-%S
Because HOMA2-%S is calculated from fasting glucose and insulin, anything that changes either input can shift your result. Visceral adiposity, sedentary lifestyle, high refined-carbohydrate intake, chronic inflammation, sleep deprivation, and chronic stress are common drivers of lower insulin sensitivity. Medications (including steroids and some glucose-lowering drugs), recent illness, and recent changes in diet or exercise can also affect fasting insulin and glucose. For the cleanest comparison, try to test under similar conditions each time and review trends rather than single points.
Frequently Asked Questions
What does HOMA2-%S measure?
HOMA2-%S estimates your insulin sensitivity as a percentage using the HOMA2 model. It reflects how effectively insulin is lowering and controlling fasting blood glucose based on your fasting insulin and fasting glucose results.
Do I need to fast for a HOMA2-%S test?
Yes. HOMA2-%S is calculated from fasting glucose and fasting insulin, so fasting is important for a meaningful result. Follow your lab instructions, and try to test under similar conditions if you plan to trend it.
What is a good HOMA2-%S number?
There is no single universal “best” cutoff because reference ranges can vary by lab and clinical context. In general, higher HOMA2-%S indicates better insulin sensitivity, while lower values suggest insulin resistance. Your best next step is to interpret the number alongside fasting insulin, fasting glucose, and other cardiometabolic markers.
How is HOMA2-%S different from HOMA-IR?
Both are insulin-resistance related indices, but HOMA2-%S comes from the updated HOMA2 model and reports insulin sensitivity as a percentage. HOMA-IR is often a simpler calculation that estimates insulin resistance directly. Your report may include one or both depending on the lab.
Can HOMA2-%S be high if my glucose is normal?
Yes. If your fasting glucose is normal and your fasting insulin is relatively low, the model may estimate higher insulin sensitivity. That can be a healthy pattern, but it should still be considered with symptoms, diet, activity, and any medications that affect glucose or insulin.
Why would my HOMA2-%S be low if my A1c is normal?
A1c reflects average glucose over about 2–3 months, and it can remain normal while your pancreas compensates by producing more insulin. HOMA2-%S can detect that compensation earlier by looking at the fasting glucose–insulin relationship.
What can I do if my HOMA2-%S suggests low insulin sensitivity?
Common next steps include confirming the pattern with repeat fasting labs and reviewing related markers such as triglycerides, HDL, and waist circumference. Lifestyle factors like sleep, stress, activity, and nutrition often influence insulin sensitivity, and in some cases a clinician may discuss medication options based on your overall risk profile.