Do you mean, how much carbs are permissible in the protein supplements you are taking?
If that's so, add the carbs in the protein supplements to the total carbs you are taking in a day.
If you are taking a lot of carbs independently, then you'll need to cut down on those carbs, so you can keep the total intake of carbs as low as you can at this point.
Make sure you get your required protein, and required liquids in first, and then let the rest follow. If you find the total of the carbs are higher than you feel comfortable with, exchange them with veggies and fruits--if you have your surgeon's okay to take them.
Admittedly, if you can find protein supplements that are low in carbs, that's the best. If you take a careful look at the labels of protein products, you may find that they have about equal amount in fat or carbs as well as protein. This is because in natural food that we consider protein food, the actual protein content is around 20% of the total weight, so compared to carb food and fatty food, the content ratio is not so high. Also, because of the texture of refined protein, it is difficult to produce a protein product that tastes/feels good unless a certain amount of sugar and fat is included.
At this point, don't bother how much carbs in protein supplements, unless they are higher than the protein count.
The FDA/NIH guideline for balanced diet is 130g carbs minimum because of the brain cell requirement (our brain cells can use only glucose with the exception of very rare conditions) but some surgeons say 100g total carbs.
Hope this helps.
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Thanks!
So long as you are putting your best foot forward, then, 
Bummer... 
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