Your husband's potassium is really high, which is called hyperkalemia clinically. Hyperkalemia is an electrolyte disorder and should be actively treated. Such high potassium will have a great impact on the heart and even threaten life.

Guiding opinions:

Hurry to the hospital to deal with it. Generally, calcium is injected intravenously first, and sodium bicarbonate solution is dripped intravenously, while potassium diuretics are used. If the urine volume is not much, you can consider dialysis to reduce potassium, which is a very effective way.

You should be careful not to eat foods with high potassium content.

Put the potassium down first, or it's too dangerous.

As for protecting kidney function and delaying the progress of kidney diseases, that is the next step.