Method and diagnostic kit for diagnosing helicobacter pylori

G - Physics – 01 – N

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G01N 33/62 (2006.01) C12Q 1/04 (2006.01) G01N 33/58 (2006.01)

Patent

CA 2456546

The invention relates to a method for diagnosing Helicobacter pylori by the oral administration of defined quantities of urea labelled with C13 and by analysing blood samples taken at a defined point in time for their C13 concentration. Said method is carried out in the following way a) Prior to the beginning of the test, between 0.1 and 0.6 ml of capillary blood is taken from the finger or ear-lobe of a fasting patient, or venous blood is taken, b) the exact dosage of between 10 and 50 mg of C13 urea in an aqueous solution with a pH value of between 2 and 4 is administered to the patient, c) capillary or venous blood is taken again exactly 10 to 15 min after said administration, d) the C13 concentration of the blood samples is determined by means of isotope mass spectrometry (IRMS) and the presence of Helicobacter pylori is inferred by an increase in the C13 values.

La présente invention concerne un procédé pour diagnostiquer un Helicobacter pylori par application orale de quantités définies d'urée marquée par C¿13? et par analyse d'échantillons de sang prélevés à un moment défini concernant la teneur en C¿13?. Ce procédé consiste a) à prélever sur des patients à jeun, avant le début du test, de 0,1 à 0,6 ml de sang capillaire dans le doigt ou dans le lobe de l'oreille ou de sang veineux, b) à appliquer aux patients la quantité exacte de 10 à 50 mg d'urée à C¿13? en solution aqueuse présentant un pH de 2 à 4, c) à prélever de nouveau du sang capillaire ou du sang veineux exactement de 10 à 15 minutes après l'application, puis d) à déterminer la teneur en C¿13? des échantillons de sang, par spectrométrie de masse par isotope (IRMS), et à conclure à la présence d'Helicobacter pylori à partir de l'augmentation des valeurs de C¿13?.

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