Gingergrrl,
I don't think there are very many doctors who are familiar with the cysteine/sulfate ratio. I stumbled upon it during my research about these things because I had already come to the conclusion that sulfite oxidase must be inhibited in these illnesses and I found the
Waring study. I suggest that you email the link or bring a copy of this study to your doctor. That what I did with our doctor, and we will be getting the test done as soon as he can get the kits from Genova.
Note that they tested quite a few people with ME and CFS, and their ratios were all high. Tell your doctor that you want to use the reference range from the Waring test, which is 1.2 as the beginning of the high range. Most of the people with ME or CFS in the Waring test came out in the red even with the Genova reference range.
The explanation below isn't very simple, but the simplest way I can say it is that I believe that this ratio shows that the iron-sulfur and/or heme is affected. Since the electron transport chain is dependent on iron-sulfur clusters and heme to transport electrons, so if heme and iron-sulfur clusters are affected, you have a problem with your mitochondria and energy production.
I think there are some other things besides rest that can be done, especially some supplements, but the exact supplements and amounts of supplements would vary for different people. The reason for getting the test is that it is an objective measurement of the health of the iron-sulfur clusters and maybe heme that you can use to monitor your progress, and if you are not making progress, you can work on modifying your protocol accordingly. The part about how the test shows the health of the iron-sulfur clusters in particular is
my hypothesis, but Rosemary Waring was the one who suggested that the test be used as a clinical biomarker.
I am convinced that the cysteine/sulfate ratio is high in these illnesses because the sulfite oxidase enzyme is inhibited, which would cause sulfate to be low in relationship to cysteine. I believe that the sulfite oxidase enzyme is inhibited because of two things: 1. the iron-sulfur clusters are damaged by oxidative stress (it is well documented that ROS damages iron-sulfur clusters), and the
molybdenum cofactor required by sulfite oxidase is synthesized using iron-sufur clusters and 2. heme synthesis is affected, and sulfite oxidase uses heme. One of the enzymes in the heme pathway is stabilized by iron-sulfur clusters, and there are other ways heme is affected, but you don't have to know what they are.
You probably don't need to tell your doctor all of that, it should probably be enough that the Waring study shows that the cysteine/sulfate ratio is high with ME/CFS, and you would like to have it tested. Also, that test has other things on it relating to oxidative stress, like glutathione levels, so the cysteine/sulfate ratio isn't the only reason for getting it done.