Is there a test that measures gender dysphoria? Gender dysphoria according to wikipedia is 


  [T]he distress a person experiences as a result of the sex and gender they were assigned at birth. In these cases, the assigned sex and gender do not match the person's gender identity, and the person is transgender.


Other sources, such as WebMD and the APA basically agree that people with gender dysphoria


  [F]eel strongly that their gender does not match their biology.


Is there a test that measures gender dysphoria? I am interested in making an adaptation to such a test into Spanish.
Short answer
Yes.

Background
A cursory Google Scholar search with the key terms Gender Dysphoria Questionnaire brought up 


  The Gender Identity/Gender Dysphoria Questionnaire for Adolescents and
  Adults.


If you wish to search for more related inventories you can look further using keywords like 'gender dysphoria' + 'inventory' / 'test' / 'diagnosis'.

References
- Deogracias et al., J Sex Res (2007); 44(4): 370–9
- Sing et al., J Sex Res (2010); 47(1): 49-58