Meaning of the word "test positive/negative for" in English

What does "test positive/negative for" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

test positive/negative for

US /ˈtest ˈpɑː.zɪ.tɪv ˈneɡ.ə.tɪv fɔr/
"test positive/negative for" picture
1.
Learn This Word at Lingoland