Does anyone stutter on words/abbreviations where the letter repeats itself? (abbreviations like SST, GTT)

Does anyone stutter on words/abbreviations where the letter repeats itself? (abbreviations like SST, GTT) I work in a pathology lab where one of the blood tubes abbreviation is SST and a blood test Glucose Tolerance Test is abbreviated to GTT.. I struggle saying both these abbreviations. It’s almost a block.. my mouth will refuse to say these letters. Anyone have tips to overcome this? I can say it alone or by myself…