The therapeutic benefit of the replacement enzyme was measured by the hydrogen breath test, which measures the activity of the sucrase enzyme. This study also measured the ability of four different doses of the replacement enzyme sacrosidase to relieve GI symptoms associated with CSID. The study included 14 patients, average age of 7.6 years, who were diagnosed with CSID. When they were given sacrosidase, results from the sucrose hydrogen breath test indicated a highly significant improvement in their ability to digest the sucrose. Among the four doses tested, the higher doses of sacrosidase resulted in greater relief of GI symptoms. The researchers concluded that sacrosidase is an effective and well-tolerated treatment for sucrase deficiency associated with CSID.1