Why does hydromorphone show up on a drug test after taking hydrocodone?
Hydrocodone Metabolizes to Hydromorphone
Hydrocodone may not cause a positive result
in a standard opiate urine test. Many opiate tests test only for
morphine (which both codeine and heroin break down into). This is true
for both home/business kits and laboratory testing. Hydrocodone does
not break down into morphine, and is therefore not detected by these
tests.
But home and laboratory testing is available that will detect
hydrocodone (and hydromorphone, which a small part of hydrocodone breaks down into when metabolized by the body.) So test
results will depend on the particular type of test that is used and
whether or not laboratory verification is required. If a home drug test
is given and the opiate test shows a positive result (due to
hydromorphone use), a laboratory verification might NOT result in a
positive test because the lab may only test for morphine. In this case,
the lab would NOT be able to verify the original positive result.
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