Fasting Insulin Test
Also known as: Insulin, Serum Insulin
What is Fasting Insulin?
Insulin is a hormone produced by the pancreas that allows cells to use glucose for energy. It regulates blood sugar levels.[MedlinePlus (NIH)]
What This Test Measures
This test measures insulin levels in your blood, usually while fasting. It helps assess insulin production and insulin resistance.[Cleveland Clinic]
Why It's Important
Insulin testing helps diagnose insulin resistance, prediabetes, and evaluate beta cell function.[MedlinePlus (NIH)]
High fasting insulin with normal glucose indicates insulin resistance, a precursor to type 2 diabetes.[American Diabetes Association]
Normal Range
Fasting: 2.6-24.9 mIU/L.
Note: Optimal fasting insulin is often considered below 10 mIU/L.
Source: Cleveland ClinicHigh Values
High fasting insulin indicates insulin resistance, often seen with obesity, PCOS, metabolic syndrome, and prediabetes. It can also be caused by insulinoma (rare).[American Diabetes Association]
Low Values
Low insulin can indicate type 1 diabetes, advanced type 2 diabetes with beta cell failure, or pancreatic disorders.[MedlinePlus (NIH)]
Test Preparation
Fasting for 8-12 hours is required.[Cleveland Clinic]
Frequently Asked Questions
How can I lower my insulin levels?
Lower insulin by reducing refined carbohydrates and sugar, exercising regularly, maintaining a healthy weight, getting enough sleep, and managing stress. Low-carb diets are particularly effective.
Source: American Diabetes AssociationReferences
Medical Disclaimer
This information is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare provider for interpretation of test results and medical decisions.
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