Not sure what a a malabsorption test consists of, but I have SIBO and it kept recurring after a week off antibiotics because I kept eating too many carbs and sugars or foods that fed the bad bacteria in my panic to gain weight. I lost 20 lbs in two months and had either diarrhea or loose stools daily. Therefore, though I ate, the bad bacteria kept highjacking nutrients before my body could absorb them. After my third round of antibiotics I went on a low FODMAP diet under the guidance of a nutritionist, and it has made all the difference. Not only have I not relapsed in two months, but I have gained 10 lbs back. I think knowing what to eat, how, and the right proportions has made all the difference for me. Please read up on SIBO diets, such as Low FODMAPS and SCD. I knew nothing about this prior to August of 2018. Wishing you good health.