Test ID: B-207 | Sample Type: Dried Blood Spot | Test Method: Immunoassay | Results: 3–5 Working Days | Laboratory: ZRT Laboratory – CLIA Certified | Report: Specialist Doctor Comment Included | Suitable For: Adults and Children | Collect Sample At Home: No Clinic Visit Required | Important: Must Be Collected Fasting
Could Insulin Resistance Be the Root Cause of Your Symptoms?
Insulin resistance is one of the most common — and most overlooked — metabolic conditions. It can develop silently for years before blood sugar rises enough to trigger a diabetes diagnosis. Fasting insulin is the earliest and most sensitive marker. If you recognise any of the following, this test could reveal what’s really happening:
- Persistent hunger or cravings, even shortly after eating
- Unexplained fatigue or energy crashes, especially after meals
- Difficulty losing weight despite diet and exercise
- Weight gain concentrated around the abdomen
- Brain fog or difficulty concentrating
- Frequent urination or extreme thirst
- Tingling or numbness in hands or feet
- High blood pressure or elevated triglycerides
- Family history of type 2 diabetes or metabolic syndrome
- Diagnosed with PCOS, fatty liver, or pre-diabetes
What Is Fasting Insulin and Why Does It Matter?
Insulin is a hormone produced by the pancreas that acts as a key to allow glucose into your cells for energy. When cells stop responding to insulin effectively, the pancreas compensates by producing more — leading to chronically elevated insulin levels long before blood glucose rises.
This is why fasting insulin is a far more sensitive early warning marker than fasting glucose or HbA1c alone. Catching elevated insulin early gives you the best opportunity to reverse insulin resistance through targeted lifestyle changes — before it progresses to type 2 diabetes or cardiovascular disease.
What This Test Measures
Fasting Insulin (μIU/mL) — the primary marker for detecting insulin resistance, assessing pancreatic beta cell function, and evaluating metabolic and cardiovascular risk — even before glucose intolerance appears.
Fasting Insulin Ranges
| Sex | Reference Range | Optimal Range |
|---|---|---|
| Women | 1–15 μIU/mL | 2–6 μIU/mL |
| Men | 1–15 μIU/mL | 2–6 μIU/mL |
Who Should Consider This Test?
- Persistent hunger, cravings, or energy crashes after meals
- Difficulty losing weight despite diet and exercise
- Abdominal weight gain or suspected metabolic syndrome
- Family history of type 2 diabetes or cardiovascular disease
- Diagnosed with PCOS, fatty liver, or pre-diabetes
- Anyone wanting to detect insulin resistance before blood sugar becomes elevated
- Monitoring the impact of diet, exercise, or medication on insulin levels
How It Works
- Order your kit — delivered to your door
- Collect your sample at home — a simple finger-prick dried blood spot taken within 1 hour of waking while fasting (no food or drink other than water)
- Post your sample to ZRT Laboratory using the return instructions provided
- Receive your results by email within 3–5 working days of the lab receiving your sample
What You Receive
- Your fasting insulin level displayed clearly in graphics and numbers with optimal and reference ranges
- Written interpretation by a Hormone Specialist PhD Doctor
- Guidance on what your result means for your metabolic health and what to do next
- Laboratory fee included — no hidden charges
Why We Use ZRT Laboratory
All testing is performed by ZRT Laboratory — a globally recognised, CLIA-certified diagnostic laboratory founded in 1998 by Dr. David Zava, PhD. ZRT has performed over 11 million tests and is trusted by healthcare professionals in 96+ countries.
Frequently Asked Questions
Why must the sample be collected fasting?
Insulin rises immediately after eating. Fasting for at least 8 hours (water only) ensures your result reflects your baseline insulin level — the only value that accurately detects insulin resistance. Non-fasting samples will produce an unreliable result.
How is fasting insulin different from HbA1c?
HbA1c reflects average blood glucose over 3 months and only becomes elevated once blood sugar is already raised. Fasting insulin can detect insulin resistance years earlier — when insulin is compensating for cellular resistance but glucose is still normal.
Does the price include the laboratory fee?
Yes. The full laboratory analysis fee is included. You are only responsible for posting your sample to the laboratory.
How long is the kit valid for?
The kit must be used within 12 months of the purchase date.