We found 8 dictionaries that define the word diagnostic tests:

General (2 matching dictionaries)

1. diagnostic tests: Vocabulary.com
2. Diagnostic tests: Wikipedia, the Free Encyclopedia

Business (1 matching dictionary)

3. Diagnostic Tests: Glossary of Health Care Terms

Medicine (4 matching dictionaries)

4. Diagnostic tests: Merck Manuals
5. Diagnostic Tests: GLOSSARY of BLOOD RELATED TERMS
6. Diagnostic tests: Medical dictionary
7. All About Hepatitis C (No longer online)

Tech (1 matching dictionary)

8. Washington State Definitions and Abbreviations of Vetrinary Terms (No longer online)

(Note: See diagnostic_test as well.)

Definitions from WordNet (diagnostic test) ▸ noun:  an assay conducted for diagnostic purposes ▸ Also see diagnostic_test Phrases: diagnostic tests routine, routine diagnostic tests, Cardiology diagnostic tests and procedures, more... ▸ Words similar to diagnostic tests ▸ Usage examples for diagnostic tests ▸ Idioms related to diagnostic tests ▸ Wikipedia articles (New!) ▸ Words that often appear near diagnostic tests ▸ Rhymes of diagnostic tests ▸ Invented words related to diagnostic tests