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The phrase "tests positive for" is correct and commonly used in written English.
It is typically used in medical or scientific contexts to describe the results of a test that indicate the presence of a particular condition, disease, or substance. Example: The blood test confirmed that the patient tests positive for HIV.
Exact(57)
(AP) JAGUARS' SMITH TESTS POSITIVE FOR COCAINE: Jimmy Smith's comeback took a turn yesterday when tests showed he had cocaine in his system, authorities said.
Any player who tests positive for ephedra is subject to a four-game suspension.
Woodroof tests positive for HIV, and is given 30 days to live.
En route to winning the 1999 Tour de France, Armstrong tests positive for the corticosteroid triamcinolone.
1. NEW FINDING CHALLENGES TOUR CHAMP'S CLAIM -- The cyclist Floyd Landis tests positive for synthetic testosterone.
The public is not notified of what drug an athlete tests positive for.
The Astana rider Matthias Kessler tests positive for testosterone in April.
Ben himself tests positive for steroids and is thrown off the team.
She faces a two-year ban if she tests positive for pseudoephedrine a second time.
If a player tests positive for marijuana a third time, he can be suspended for five games.
In France, the trainer of a horse that tests positive for steroids will lose his or her license — permanently.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com