What Drugs Show Up As Lithium

My friend went to urgent care and they called her and said she tested positive for lithium. She doesn't take lithium but is on trazodone, seroquel, depakote, prozac, amitriptyline, minipress, chantix and gabapentin.

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I don't know of a drug that tests positive for lithium, but there is a particular vial used for collecting blood samples that has a green cap and contains lithium and heparin. (It keeps blood from clotting, which is sometimes important.)

A demonstration of this was done using volunteers who had never taken any psychiatric drugs. In the vials the lithium/heparin, volunteers' Lithium levels were as high as 4 mmol/L. That's considered a seriously toxic level, which would have led to all kinds of unnecessary measures if it had happened in an emergency room.

Link: ncbi.nlm.nih.gov/pubmed/18072115

I know all this because it happened to me once. The nurse did not appear to believe me when I told her I did not take lithium. I went home and looked it up and found out about the special vials with lithium heparin in them. My false lithium reading was so high that it could have been extremely harmful to my health, but the nurses didn't seem to know that.

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