Rachel Posted February 12, 2014 Author Report Posted February 12, 2014 Has anyone done the BH 4 Test? This test has to be sent to France. From what I researched it looks for a Tetrahybiopterin defiency. The doctor's nurse said it was another marker for inflammation. So I am a little confused. When I talked to our doctor on Saturday, I mentioned to him about my son's face rash and the rash that keeps coming and going on his arms. I sent him pictures of what it looked like. He thought this might could be connected to MCAS and suggested that we have this testing done. Is a Tetrahybiopterin defiencey related to MCAS?
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