title: Interference by pralidoxime (PAM) salts in clinical laboratory tests.
abstract: BACKGROUND
  Drugs sometimes alter the results of clinical laboratory tests. We examined the effects of pralidoxime (PAM) salts, a medicine used to treat organophosphorus poisoning, on clinical laboratory test results for the first time.
  
  
  METHODS
  The effects of PAM salts on glucose (GLU) measurements were examined using a point-of-care testing (POCT) meter, four self-monitoring of blood glucose (SMBG) meters, and two biochemical autoanalyzers. The effects of PAM salts on other clinical tests were also evaluated.
  
  
  RESULTS
  The addition of PAM iodide or potassium iodide, but not of PAM chloride or potassium chloride, to blood samples increased the GLU values measured by one POCT meter and 4 SMBG meters using the enzyme electrode (hydrogen peroxidase or oxygen electrode) method. On the other hand, PAM iodide or PAM chloride, but not KI or KCl, affected the values measured at 340 nm by an autoanalyzer using absorption spectrophotometry in 8 of 14 clinical laboratory tests. The absorption spectrum of PAM changed from 294 to 338 nm due to the reaction between PAM and the alkaline buffer, a component of the measuring reagents.
  
  
  CONCLUSIONS
  PAM iodide increases the GLU values measured by the enzyme electrode method, and PAM salts affected the values measured at 340 nm by absorption spectrophotometry in many other clinical test items.
authors.affiliation: Department of Biomedical Informatics, Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
authors.forename: Sumika
authors.initials: S
authors.lastname: Nagase
authors.forename: Katsunori
authors.initials: K
authors.lastname: Kohguchi
authors.forename: Kaoru
authors.initials: K
authors.lastname: Tohyama
authors.forename: Mikio
authors.initials: M
authors.lastname: Watanabe
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Iwatani
mesh_terms: D001786:Blood Glucose / Q000032:analysis; D015190:Blood Glucose Self-Monitoring / Q000592:standards; D019411:Clinical Laboratory Techniques / Q000592:standards*; D003951:Diagnostic Errors; D006801:Humans; D019095:Point-of-Care Systems; D011220:Pralidoxime Compounds / Q000737:chemistry*
chemical_list: D001786:Blood Glucose; D011220:Pralidoxime Compounds; C028797:pralidoxime