An algorithm for processing mass spectra of gases exhaled by patients has been proposed in the paper. The mass spectra are recorded on the MS7-200 quadrupole mass spectrometer. with electronic ionization and with direct capillary injection of the sample. The algorithm is based on transforming an array of spectra (not less than 10) in the space of principal components. https://www.folkinterioers.shop/product-category/cloth-napkins/