Note:
According to APA style, Section 6.18, names of tests, scales, questionnaires, etc. are considered proper names, and therefore always capitalized--even in title section of references. However, if words such as "test" or "scale" is not part of the test or scale title, then do not capitalize that word.
Manual for a test, scale, or inventory
Dunn, D. M. (2019). Peabody Picture Vocabulary Test-5 (PPVT-5): Manual. Pearson.
How to cite this work in-text:
Parenthetical: (Dunn, 2019)
Narrative: Dunn (2019)
Direct quote: (Dunn, 2019, p. 10)