A system for recording chest signals of a user, the system comprising: a sensing unit comprising a first sensor configured to record a chest signal from the chest of the user; a remote control device connectable with the sensing unit and configured to generate guiding information comprising a recording procedure to follow when performing the recording; a processing unit configured to process the chest signal so as to pre-process the recorded chest signal, to extract features of the chest signal and to use the extracted features to determine a confidence criterion of the chest signal; the remote control device being further configured to generate instructional information comprising information about the determined confidence criterion, and comprising an interface allowing the user, or an assistant performing the recording on the user, to initiate and/or stop the recording or initiate a further analysis of the processed chest signal; characterized in that the system comprises: a storage media configured to store the following data: the recorded chest signal, the processed chest signal, the determined confidence criterion and said guiding information, said data building a user-specific database; a supervised database comprising said user-specific database; wherein said guiding information comprises breathing guidance information to inform the user what respiratory movement to perform during the recording of a chest signal; wherein the system is configured for using the supervised database in combination with a machine-learning classification or regression method to optimize the determination of the confidence criterion using the extracted features, and for generating said guiding information comprising breathing guidance information to inform the user what respiratory movement to perform during the recording of the chest signal; and wherein the system is further configured to store the recorded chest sounds, confidence criterion and guiding information in the user-specific database and to ask the patient to record chest signals on another chest location if the confidence criterion indicates a good measured chest signal, and to ask the patient to record chest sounds a second time on the same chest location and use the breathing guidance information to inform the user on how to increase quality of the recorded chest signals in the second recording if the confidence criterion indicates that the measured chest signal is unreliable and can not be used for diagnosis. a sensing unit comprising a first sensor configured to record a chest signal from the chest of the user; a remote control device connectable with the sensing unit and configured to generate guiding information comprising a recording procedure to follow when performing the recording; a processing unit configured to process the chest signal so as to pre-process the recorded chest signal, to extract features of the chest signal and to use the extracted features to determine a confidence criterion of the chest signal; the remote control device being further configured to generate instructional information comprising information about the determined confidence criterion, and comprising an interface allowing the user, or an assistant performing the recording on the user, to initiate and/or stop the recording or initiate a further analysis of the processed chest signal; characterized in that the system comprises: a storage media configured to store the following data: the recorded chest signal, the processed chest signal, the determined confidence criterion and said guiding information, said data building a user-specific database; a supervised database comprising said user-specific database; a storage media configured to store the following data: the recorded chest signal, the processed chest signal, the determined confidence criterion and said guiding information, said data building a user-specific database; a supervised database comprising said user-specific database; wherein said guiding information comprises breathing guidance information to inform the user what respiratory movement to perform during the recording of a chest signal; wherein the system is configured for using the supervised database in combination with a machine-learning classification or regression method to optimize the determination of the confidence criterion using the extracted features, and for generating said guiding information comprising breathing guidance information to inform the user what respiratory movement to perform during the recording of the chest signal; and wherein the system is further configured to store the recorded chest sounds, confidence criterion and guiding information in the user-specific database and to ask the patient to record chest signals on another chest location if the confidence criterion indicates a good measured chest signal, and to ask the patient to record chest sounds a second time on the same chest location and use the breathing guidance information to inform the user on how to increase quality of the recorded chest signals in the second recording if the confidence criterion indicates that the measured chest signal is unreliable and can not be used for diagnosis.