Conversation: The conversation between human and AI assistant.
[|Human|] I have been on Morphine Sulfate ER 60 mg BID for back pain and my last 3 drug screens have not detected in my saliva. I have been taking my medication as prescribed. I am about 5 8 and about 320 lbs. Can you give me any explanation as to why it wouldn t show up in the saliva test. I just went to my PCP yesterday and he did order me a blood test to check. I am awaiting those results. Thank you, Lynn Schututer
[|AI|]  Hello thanks for consultation with Chat Doctor.a cut-off concentration of 40 ng/ml for immunoassay screening for Opiates in saliva. The saliva Test will give a positive result if morphine is present at or above this concentration in human saliva. A more specific alternate chemical method must be used in order to obtain a confirmed analytical result. Gas chromatography/mass spectrophotometry (GC/MS) is the preferred confirmatory method.Hence, your treating physician has suggested a blood test.hope it helps,TC