IGF-2 (Insulin-Like Growth Factor 2) Blood Biomarker Testing
It measures IGF-2, a growth-related hormone that can shift with certain tumors and metabolic states; order through Vitals Vault with Quest labs.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
IGF-2 (insulin-like growth factor 2) is a hormone involved in growth signaling and how your body handles fuel. In adults, it is usually tested for a specific reason rather than as a general wellness marker.
Most people encounter IGF-2 testing during an evaluation for unexplained low blood sugar (hypoglycemia), or when a clinician is looking for hormone patterns that can occur with certain tumors. Because the interpretation depends heavily on your symptoms and companion labs, your result is most useful when it is reviewed in context rather than in isolation.
If you are comparing lab options, it helps to know what IGF-2 can and cannot tell you, what “low” or “high” typically means, and which related tests often clarify the picture.
Do I need a IGF-2 test?
You may be a good candidate for an IGF-2 test if you have episodes that feel like low blood sugar—such as shakiness, sweating, confusion, blurred vision, or symptoms that improve after eating—especially when fingerstick or lab glucose has been documented as low.
IGF-2 is also sometimes ordered when you have recurrent or severe hypoglycemia without an obvious cause (for example, you are not using insulin or certain diabetes medications), or when imaging or clinical history raises concern for a tumor that could affect growth-factor signaling. In that setting, IGF-2 is often interpreted alongside insulin, C-peptide, beta-hydroxybutyrate (ketones), cortisol, and IGF-1.
If your goal is general metabolic or “anti-aging” screening, IGF-2 is usually not the first-line test. IGF-1 is more commonly used to reflect growth hormone activity, while IGF-2 is reserved for targeted questions.
Testing can support clinician-directed care, but it cannot diagnose a condition by itself. The most helpful next step is usually pairing your IGF-2 result with your symptoms, timing (fasting vs after meals), and a structured hypoglycemia workup if low glucose is part of the story.
IGF-2 is measured from a blood sample in a CLIA-certified laboratory; results are educational and should be interpreted with your clinician, not used as a standalone diagnosis.
Lab testing
Order IGF-2 testing through Vitals Vault and draw at Quest
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
Vitals Vault lets you order IGF-2 testing and related labs without needing to coordinate logistics on your own. You choose the test, complete checkout, and then visit a nearby Quest location for the blood draw.
Once your results are ready, PocketMD can help you make sense of what the number may suggest, what follow-up labs are commonly paired with IGF-2, and what questions to bring to your next appointment. This is especially useful when your symptoms come and go and you want a clear plan for retesting or for capturing labs during an episode.
If your IGF-2 result raises a targeted concern, you can use Vitals Vault to add companion markers (such as IGF-1 or insulin/C-peptide) so your clinician has a more complete dataset to interpret.
- Order online and draw at a nearby Quest location
- PocketMD guidance for next steps and retest timing
- Easy add-ons for companion labs when interpretation needs context
Key benefits of IGF-2 testing
- Helps evaluate unexplained or recurrent hypoglycemia when insulin-related causes are not clear.
- Adds a specific clue for non–islet cell tumor hypoglycemia patterns when interpreted with glucose and insulin markers.
- Supports interpretation of growth-factor signaling when paired with IGF-1 (and sometimes an IGF-2:IGF-1 pattern).
- Can guide which follow-up tests to prioritize during a supervised or “critical sample” hypoglycemia workup.
- Helps you and your clinician distinguish targeted endocrine questions from general metabolic screening.
- Provides a baseline you can trend if you are monitoring a known condition or following treatment over time.
- Makes it easier to coordinate companion testing and interpretation support through PocketMD after results post.
What is IGF-2?
IGF-2 (insulin-like growth factor 2) is a hormone that has insulin-like effects and participates in growth and cell signaling. It is produced in several tissues, including the liver, and it circulates in the blood mostly bound to carrier proteins (IGF-binding proteins), which affects how much is “free” to act on tissues.
In adults, IGF-2 is not typically used as a broad health marker. Instead, it is most often used as part of a focused evaluation when low blood sugar is occurring without a clear explanation. Some tumors can produce excess IGF-2 or altered forms of IGF-2, which can increase glucose use in tissues and suppress the body’s usual counter-regulatory responses, contributing to hypoglycemia.
Because IGF-2 interacts with other hormones and binding proteins, a single value rarely tells the whole story. Your clinician may compare IGF-2 with IGF-1 and with “critical sample” labs collected at the time your glucose is low to understand whether IGF-2 is likely contributing to symptoms.
How IGF-2 relates to low blood sugar
When IGF-2 activity is high relative to other signals, it can act in insulin-like ways, pushing glucose into tissues and reducing glucose production by the liver. In certain clinical scenarios, this can be associated with low insulin and low C-peptide during hypoglycemia, which is a different pattern than insulin overproduction or insulin use.
Why companion tests matter
IGF-2 is best interpreted with the glucose value and with hormones that explain why glucose is low. Common companions include insulin, C-peptide, proinsulin, beta-hydroxybutyrate, cortisol, and IGF-1. Imaging or specialist evaluation may be considered depending on the overall pattern.
What do my IGF-2 results mean?
Low IGF-2 levels
A low IGF-2 result is often nonspecific and may reflect reduced overall growth-factor production, changes in nutrition status, or shifts in binding proteins rather than a single disease. If you are being evaluated for hypoglycemia, a low IGF-2 generally does not point toward an IGF-2–driven mechanism by itself. Your clinician will usually weigh it alongside IGF-1, liver function, and the circumstances of the blood draw (fasting, illness, recent weight loss). If symptoms persist, the next step is often to focus on capturing a “critical sample” during a true low-glucose episode.
In-range (typical) IGF-2 levels
An in-range IGF-2 level means your result falls within the laboratory’s expected range for the method and population it uses. This does not automatically rule out a cause of hypoglycemia, because many hypoglycemia mechanisms do not involve IGF-2. If you have symptoms, the most informative data are often glucose plus insulin/C-peptide and ketones at the time symptoms occur. Your clinician may still order IGF-1 or other endocrine tests if the clinical picture suggests a hormonal driver.
High IGF-2 levels
A high IGF-2 result can be a meaningful clue when it matches your clinical story, especially in the setting of documented hypoglycemia with low insulin and low C-peptide. In some cases, elevated IGF-2 (or an IGF-2 pattern relative to IGF-1) is associated with non–islet cell tumor hypoglycemia, but the diagnosis requires a broader evaluation. High results can also be influenced by assay differences and binding-protein effects, so confirmation with companion labs is common. If your result is high, ask your clinician whether repeating the test and adding IGF-1 and a hypoglycemia “critical sample” panel would clarify the next step.
Factors that influence IGF-2
Your IGF-2 level can vary with age, nutritional status, acute illness, liver function, and changes in IGF-binding proteins that affect how IGF-2 circulates. Timing matters: a sample drawn during fasting, during illness, or during a true hypoglycemia episode may be interpreted differently than a routine daytime draw. Some medications and hormone states can indirectly shift growth-factor signaling, which is another reason companion tests are often ordered. Different labs and methods can yield different reference ranges, so your “high” or “low” should be judged against the range printed on your report.
What’s included
- Igf 2
Frequently Asked Questions
What is the IGF-2 blood test used for?
IGF-2 testing is most often used as part of a targeted evaluation for unexplained hypoglycemia. It can help your clinician assess whether an IGF-2–driven pattern is possible, especially when insulin-related causes are unlikely based on insulin and C-peptide results.
Do I need to fast for an IGF-2 test?
Many labs can measure IGF-2 without fasting, but fasting status can affect how your clinician interprets the result—especially if hypoglycemia is the reason for testing. If your order is part of a hypoglycemia workup, ask whether your clinician wants the sample drawn fasting or during symptoms.
What is a normal range for IGF-2?
There is not one universal “normal” range because reference intervals vary by laboratory method and population. Use the range printed on your report, and interpret your value alongside IGF-1 and your clinical context rather than comparing to a single number found online.
What does high IGF-2 mean?
High IGF-2 can be a clue in certain hypoglycemia patterns, including non–islet cell tumor hypoglycemia, but it is not diagnostic on its own. Your clinician will typically look at glucose, insulin, C-peptide, ketones, cortisol, and often IGF-1 to determine whether the overall pattern fits.
What does low IGF-2 mean?
Low IGF-2 is often nonspecific and may relate to nutrition status, acute illness, liver function, or differences in binding proteins. If you are symptomatic, the next step is usually to focus on documenting low glucose and collecting companion labs during an episode.
Should IGF-2 be tested with IGF-1?
Often, yes. IGF-1 provides complementary information about growth-factor signaling, and the relationship between IGF-2 and IGF-1 can help your clinician decide whether IGF-2 is likely contributing to symptoms or whether another pathway is more likely.
When should I retest IGF-2?
Retesting depends on why it was ordered. If the result was borderline or unexpected, your clinician may repeat it to confirm, ideally under similar conditions. If hypoglycemia is intermittent, the highest-yield approach is often to retest as part of a structured “critical sample” during a documented low-glucose event.