Ordering the IGF-1 (Insulin-Like Growth Factor) Test
Testing for IGF-1, also known as insulin-like growth factor, helps measure how much growth hormone your body is making. This test is often used to check for problems with growth, muscle strength, or energy levels. Interestingly, IGF-1 levels can also help track how well certain treatments for growth hormone disorders are working over time.
Ordering this test can provide clear answers about your body’s growth hormone activity. When you order, you can expect these specific benefits:
- Detects abnormal growth hormone production, which can affect bone and muscle development.
- Helps monitor treatment for growth hormone disorders, making it easier to adjust care if needed.
- Supports the diagnosis of conditions like acromegaly or pituitary gland issues.
- Assists in finding the cause of unexplained changes in energy, muscle mass, or growth patterns.
- Offers a way to check for rare genetic conditions that impact growth and metabolism.
Who Might Benefit from Growth Factor Testing
A person who has noticed slower growth in their child, or an adult who feels weaker and more tired than usual, may find this test helpful. For example, a parent may see their child is not growing as quickly as classmates, leading to questions about possible hormone issues.
Ordering this test may also be useful in these situations:
- Someone with unexplained muscle loss or weakness.
- A person being treated for a pituitary gland disorder.
- Adults with changes in bone density or frequent bone pain.
- People with a family history of growth hormone problems.
- Those with diabetes who are experiencing unusual changes in blood sugar control, since IGF-1 can affect how the body uses insulin.
This test should be ordered to check for hormone imbalances that can affect bone growth, muscle strength, and how the body uses energy. Delaying this test could make it harder to find and treat hormone problems early, which may lead to more noticeable changes in growth or strength over time. To get clear answers, consider ordering this test when you notice these changes.
Preparing for Your Insulin-Like Growth Factor Lab
Fasting is not required before this test, so you can eat and drink as usual unless your doctor gives you different instructions. Always follow any directions your healthcare provider gives you to make sure your results are as helpful as possible.
Labs Included When Ordering Your IGF-1 (Insulin-Like Growth Factor) Test
| Test Name | Reference Range | What This Biomarker Shows | Low and High Levels of IGF-1 (Insulin-Like Growth Factor) |
|---|---|---|---|
| Insulin-Like Growth Factor (IGF-1) | 115–355 (adults 21–30 years) | IGF-1 is a hormone made by the liver that reflects how much growth hormone is in your body. It helps control bone growth, muscle mass, and how your body uses sugar and fat. |
High levels mean your body may be making too much growth hormone, which can cause conditions like acromegaly or abnormal bone growth.
Low levels mean your body may not be making enough growth hormone, which can lead to slow growth, weak muscles, or low bone density. |
Reference ranges can change based on age, sex, and lab methods. For the most current values, visit the Quest Diagnostics lab test directory.
IGF-1 FAQ
Is there IGF-1 testing near me?
You can find a nearby location for IGF-1 testing using the patient service center locator, which also lists mobile phlebotomy options. This is especially helpful if you need regular monitoring for hormone changes and want a convenient place for blood draws.
What is the cost of the test?
The price you see for the IGF-1 test includes all fees, including sample collection at patient service centers. Ordering this test is worth it if you are experiencing unexplained changes in growth or muscle strength and want clear answers.
How often should I retest?
Most people retest every 6 to 12 months, especially if they are being treated for growth hormone problems or their doctor is tracking changes over time. Regular retesting helps track how well treatments are working and if hormone levels are staying in a healthy range.
How accurate is the test?
The IGF-1 test uses a chemiluminescent immunoassay method, which is known for its high precision. The test has a specificity of 98% and a sensitivity of 97%. All tests at TrueHealthLabs.com are performed by CLIA-certified labs, meeting strict quality and precision standards.
Important Notes
None.
Medical Review Board
Reviewed by Jeff Donohue M.D. from Body Logic and Brady Hurst DC, CCCN. Written by True Health Lab’s team of editorial health contributors.
Disclaimer: This information is for educational purposes only and not intended as medical advice. Consult your healthcare provider for personalized guidance.
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