IGF-BP3 Blood Test, from our experts to you. Dr Sam Rodgers MBBS, MRCGPChief Medical Officer meet our doctors What is the IGF-BP3 Blood Test? This is a test to measure levels of IGF-BP3 in your blood. Can I take biotin before this test? No, we do not recommend taking biotin supplements for two days before the IGF-BP3 Blood Test. If you have been prescribed biotin, please discuss this with your doctor. What's included? Proteins Select profile for more information Proteins IGF BP - 3 How to prepare for your test Special instructions Prepare for your IGF-BP3 Blood Test by following these instructions. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed.