What is a Negative Dilute?
A dilute specimen is one that has a higher than normal ratio of water to uric acid. There are two possible types of Negative Dilute.
The first type (and most common) are those that fall only minorly outside of the normal range. How the employer actions on this depends on their policy, many employers simply take Negative Dilutes as Negatives, however some do choose to redo the collection. Under the DOT a Negative Dilute is considered a Negative test. A dilution at this range could be due to the donor drinking lots of water in preparation for the test, or because they have kidney or liver issues, or due to medication etc.
The second type is the Negative Dilute that falls within the substitution range. This result REQUIRES a recollection under direct observation as it falls into the substituted range, meaning that it is known that this was NOT a real/proper urine sample.
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