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Dear Cathryn, Do you suspect this reaction was discovered in the sink? In case you are interested, there is a brief overview of various other methods for isoniazid analysis (with references) about halfway down the relevant "IPCS Inchchem" webpage:- http://www.inchem.org/documents/pims/pharm/pim288.htm Best wishes, Les > From: "Corns, Cathryn" <[log in to unmask]> > > I've recently been sent a paper by one of our Chest physicians [Use of > the urine color test to monitor compliance with Isoniazid treatment of > latent tuberculosis infection, Markus et al, Chest 2003; 123: 736-739] > > This uses a 'simple' urine test [Arkansas color test] > .... > It seems to use Chloramine-T, barbituric acid and KCN. > ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/