GBT stands for Gender-Based Test. However, if you're looking for synonyms for this phrase, there are quite a few options. For starters, you could try Gender-Specific Testing, which conveys a similar meaning. Other potential synonyms include Sex-Based Assessment, Gender-Focused Examination, and Gender-Centric Evaluation. Alternatively, you could use phrases like Sex-Related Testing, Gender-Oriented Analysis, or even simply Gender-Sensitive Assessment. Ultimately, the best synonym for GBT will depend on the context in which you're using it, as well as the audience you're communicating with. Whatever phrase you choose, it's important to make sure it accurately communicates the intended meaning.