KB test can refer to two different medical tests:
* The Kirby–Bauer test (
agar diffusion test
The disk diffusion test (also known as the agar diffusion test, Kirby–Bauer test, disc-diffusion antibiotic susceptibility test, disc-diffusion antibiotic sensitivity test and KB test) is a culture-based microbiology assay used in diagnos ...
), a test of the antibiotic sensitivity of bacteria
* The Kleihauer–Betke test (
acid elution test), a test of the amount of fetal hemoglobin transferred from a fetus to a mother's bloodstream
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