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Discover LudwigThe phrase "positive sample" is correct and usable in written English.
It is often used in scientific or research contexts to refer to a specific sample or group of samples that exhibit the desired and expected characteristics or outcomes. Example: The study required participants to provide a positive sample of their urine to confirm their eligibility for the trial.
Exact(55)
The earliest British positive sample was a salmonella from 2012.
Testers targeted him for a test on 29 April which turned up the positive sample.
The deflection is football's equivalent of a positive sample: it disqualifies all goals from a place in the pantheon.
And Jason Grimsley told federal agents in 2006 that he was told that he had a positive sample in 2003.
The number of colony-forming units/ml in a Mycoplasma positive sample are counted.
"The additional positive sample is consistent with him taking responsibility," said the Usada chief executive, Travis Tygart.
Similar(5)
The HIV-positive sample was collected in two public service agencies that provide case management for HIV-positive individuals.
Prevalence of childhood sexual abuse and physical trauma in an HIV-positive sample from the deep south.
One PCR-positive sample in this group was also smear positive for fungus.
‡One adenovirus-positive sample.
Notes: "+" PCR-positive sample, "-" PCR-negative sample.
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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