A screening drug test in toxicology refers to measuring the amount and presence of drugs present in one's blood. It includes legal drugs and illegal drugs depending on the scenario of screening. It is most relevant in testing for drug intoxication, substance abuse, or drug overdosage. Most of the time a blood sample or urine sample is used for testing. Rarely, saliva or hair samples are also tested.
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Can a drug test be falsely negative due to excess intake of water?
Query: Hi doctor, I took a drug test and it came out negative, I am on Oxycodone 5 ml, Gabapentin, Methocarbamol and Lisinopril. How could it come out negative while taking these drugs? I drink a lot of water. Is this the cause? How does this happen? Please help. Read Full »
Answer: Hi, Welcome to icliniq.com. Two common potential causes for false negative opiate tests are using the wrong test for a specific opiate or having an insufficient concentration of an opiate in the sample. Other possible reasons can be due to dilution. For example, ingesting a substantial amount of wa... Read Full »
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