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Roerig, D.L. et al.

Radioimmunuassay compared to thin-layer and gas--liquid chromatography for detecting methadone in human urine.

Radioimmunoassay was compared to thin-layer and gas--liquid chromatographic methods for detection of methadone in the urine of patients undergoing methadone maintenance therapy as treatment of heroin abuse. With urine samples known to contain methadone, 84% were positive by thin-layer chromatography as compared to 99% positives by the other two methods. This difference is attributed to the difference in sensitivity of the three methods. All three methods gave consistently positive results with urine samples from patients receiving 25 mg of methadone per day or more. With smaller daily doses the percentage of positive results obtained with thin-layer chromatography decreased. Analysis of urine samples not containing methadone showed no incidence of cross reaction of other drugs with the methadone radioimmunoassay. The methadone radioimmunoassay appears to be both sensitive and reliable; however, certain other factors limit its use as a primary screening method.[1]

References

Radioimmunuassay compared to thin-layer and gas--liquid chromatography for detecting methadone in human urine. Roerig, D.L., Wang, R.I., Mueller, M.M., Lewand, D.L., Adams, S.M. Clin. Chem. (1976) [Pubmed]

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