Insulin, 1 Hour, Glucose-75 g
This test measures insulin levels one hour after a 75-gram glucose load. It helps assess how vigorously your pancreas responds to sugar and identifies early insulin resistance.
- DHA-licensed lab
- Includes Doctor Consultation
- Physician-reviewed
- Same Day Collection
24 hours
Turnaround
Blood
Sample
What the Insulin, 1 Hour, Glucose-75 g test tells you
This test measures your insulin one hour after you drink the standard 75-gram glucose load. It is a dynamic procedure rather than a simple blood test: you arrive fasting, the glucose solution is given, and you remain at the facility until the timed sample is taken. The one-hour point is chosen deliberately, because it sits close to where the insulin response should be at its most vigorous, and therefore says more about the pancreas at work than a resting measurement can.
What the sample captures is the early insulin surge. A healthy pancreas holds a reserve of ready-made insulin and releases it quickly when glucose rises, blunting the peak before the slower, newly manufactured second wave arrives. An unusually large one-hour insulin value usually means that surge is having to be enormous to achieve an ordinary effect: the signature of insulin resistance, in which tissues respond poorly and the pancreas compensates. A disproportionately small value points the other way, toward a pancreas that is losing its capacity to mount that early release, which is one of the first measurable changes on the path to type 2 diabetes.
The result is read alongside the glucose measured at the same moment, because insulin without its matching glucose is close to uninterpretable: a given insulin level means one thing if glucose is high and something quite different if glucose is ordinary. Two caveats apply throughout. Insulin measurement is not the route to a diabetes diagnosis, which rests on glucose and HbA1c, and anyone taking injected insulin cannot be assessed this way: the assay cannot separate injected hormone from the body's own, so C-peptide is used instead.
Used alongside glucose tolerance testing to characterise insulin dynamics and differentiate between various stages of metabolic dysfunction.
- Captures the early surge
The one-hour sample lands near the height of the insulin response, showing how vigorously the pancreas reacts to a standardised sugar load.
- Detects compensating resistance
A very large insulin response to an ordinary load suggests the tissues are responding poorly and the pancreas is working hard to conceal it.
- Flags early beta-cell decline
A disproportionately small early response can indicate that the pancreas is beginning to lose its reserve, often before glucose tests change.
- Interpreted with matching glucose
Paired with the glucose from the same time point, it distinguishes an appropriate insulin response from an excessive or inadequate one.
Reasons your doctor may request the Insulin, 1 Hour, Glucose-75 g test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Part of a glucose tolerance test
- You are undergoing glucose tolerance testing and your doctor wants the insulin response characterised as well as the glucose.
- Your glucose results are ambiguous and the insulin response may clarify whether resistance or reduced secretion is the issue.
PCOS & metabolic risk
- You are being assessed for polycystic ovary syndrome, where an exaggerated insulin response is common.
- You have significant metabolic risk factors such as central obesity or fatty liver disease despite acceptable glucose results.
Low blood sugar after eating
- You experience symptoms of low blood sugar in the hours after eating and the early insulin response is being examined.
The one-hour sample, reported in µIU/mL, is read beside the glucose drawn at the same moment. A result in the Normal band means your pancreas produced the early surge expected for the amount of sugar it was given. A High result usually means that surge had to be far larger than the load should require: the signature of insulin resistance, where tissues respond poorly and the pancreas compensates. Excess abdominal and liver fat, polycystic ovary syndrome, corticosteroids and some antipsychotics all push it up, as does rapid stomach emptying after bariatric surgery; injected insulin is measured together with your own and inflates the figure, which is why C-peptide is used instead. A value at the low end alongside rising glucose points the other way, to an early surge the pancreas can no longer mount. Your doctor interprets the response with your glucose, symptoms and history.
Medically reviewed by Dr Nirupama Sabhapathy
Ranges are a guide: your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Insulin resistance, in which a large early surge is needed to produce an ordinary glucose effect.
- Excess body fat, especially abdominal and liver fat, which blunts the tissues' response to insulin.
- Polycystic ovary syndrome, frequently accompanied by an exaggerated early insulin release.
- Medications that impair insulin action, including corticosteroids and some antipsychotics.
- Injected insulin, which is measured together with the body's own and inflates the result.
- Rapid stomach emptying after bariatric surgery, which provokes an unusually brisk early insulin release.
What a lower result can point to
- Declining beta-cell function, which reduces the reserve of ready-made insulin available for the early surge.
- Type 1 diabetes or advanced type 2 diabetes, in which insulin production is substantially reduced.
- Pancreatic damage from chronic pancreatitis, cystic fibrosis or pancreatic surgery.
- Prolonged fasting, marked recent weight loss, or severe undernutrition before the test.
- Adrenal or pituitary insufficiency, which reduces the hormonal drive to secrete insulin.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.
What this test cannot tell you
- Insulin is not the basis for diagnosing diabetes; glucose measurements and HbA1c are, and this test contributes supporting information about insulin resistance and unusual presentations.
- The value means little without the glucose measured at the same moment, since the same insulin level can be appropriate or excessive depending on the glucose it accompanies.
- It cannot be interpreted in anyone taking injected insulin, because the assay does not distinguish administered hormone from the body's own; C-peptide is used instead.
- Insulin assays differ between laboratories and there is no universally agreed interpretation of one-hour insulin, so results are best compared within a single laboratory.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1You fast overnight, drink the measured 75-gram glucose solution, and stay at the facility until the timed one-hour sample is taken.
- 2The sample reflects the early insulin surge: how promptly and how forcefully the pancreas responds to a sugar load.
- 3It is read together with the glucose from the same time point, never on its own.
- 4Diabetes is diagnosed from glucose and HbA1c; this test adds information about insulin resistance rather than making the diagnosis.
- 5If you take injected insulin, tell the team beforehand: C-peptide is the appropriate measurement in that case.
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Frequently Asked Questions
Everything you need to know about the Insulin, 1 Hour, Glucose-75 g test. Can't find what you're looking for?
Talk to our team→Our laboratory reports up to 80 µIU/mL as the expected one-hour response, and 81 to 300 µIU/mL as high, an exaggerated response that may indicate insulin resistance. There is no universally agreed interpretation of one-hour insulin and assays differ, so results are best compared within one laboratory and always read beside the glucose from the same moment.
A low one-hour insulin, especially alongside a rising glucose, points towards an early surge the pancreas can no longer mount. That can reflect declining beta-cell function, type 1 or advanced type 2 diabetes, or pancreatic damage from chronic pancreatitis or surgery. Prolonged fasting, marked recent weight loss and adrenal or pituitary insufficiency can also lower it.
Yes. Polycystic ovary syndrome is frequently accompanied by an exaggerated early insulin release, so a high one-hour insulin is a common finding. The result supports a picture of insulin resistance rather than diagnosing PCOS, and your doctor reads it with the glucose from the same time point, your symptoms and your other hormone tests.
No. Diabetes is diagnosed from glucose measurements and HbA1c, not from insulin. The one-hour insulin adds information about how forcefully the pancreas responds, which helps characterise insulin resistance and unusual presentations. It is most useful alongside a glucose tolerance test, where the insulin and glucose values from the same moments are read together.
Yes. Corticosteroids and some antipsychotics impair insulin action and push the result up. After bariatric or other upper gastrointestinal surgery, the stomach empties quickly and provokes an unusually brisk early insulin release. Tell the team about any of these before the test begins, so your doctor can interpret the figure correctly.
A fasting value shows the baseline the pancreas maintains at rest, whereas the one-hour sample shows how it performs under a standardised challenge. The early surge is often the first part of the response to change, so a resting measurement can look unremarkable while the dynamic response is already abnormal.
Because an insulin level is only meaningful relative to the glucose that provoked it. A large insulin response accompanying a high glucose means something different from the same response accompanying an ordinary glucose, and your doctor reads the pair together.
No. It suggests your tissues are responding poorly to insulin and your pancreas is compensating, which is a risk state rather than an outcome. Many people in that state never progress, particularly where weight, diet and activity change, and your doctor will discuss what the finding means for you.
Not meaningfully. The assay measures all the insulin in your blood without distinguishing what you injected from what your pancreas produced. C-peptide is measured instead, because it is released by the pancreas alongside its own insulin and is absent from injected preparations.
Yes. Fast overnight for eight to twelve hours with plain water only: no tea or coffee, juice, chewing gum, mints or smoking. Eat normally, without restricting carbohydrates, for several days beforehand.
The 1-hour insulin test is AED 70, including a physician-reviewed report, with results usually within 24 hours. Home collection anywhere in Dubai is free when your order reaches AED 300 or includes a package; below that, a AED 100 home collection fee applies (AED 50 for a lab walk-in).