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IGF-1 Blood Test Explained
 
 
The IGF-1 blood test measures the amount of insulin-like growth factor 1 (IGF-1) in your blood, which is highly correlated with the "average" circulating levels of growth hormone in your blood.  Following is a sample of the results of the  IGF-1 blood test. The reference interval indicates the normal ranges and the flag indicates a result outside of those ranges.