Method of performing an analytical measurement using a mobile device

A method of performing an analytical measurement using a mobile device having a camera, the method comprising:

• i) using the camera to capture a time series of images of at least a part of a medical article;
• ii) deriving, from the time series of images, image-derived position information on a relative position of the mobile device and the medical article, thereby generating a first time series of position information;
• iii) using a sensor of the mobile device to capture measurement information on the relative position of the mobile device and the medical article;
• iv) deriving, from the measurement information alone or in combination with the image-derived position information, measurement-derived position information on the relative position of the mobile device and/or the medical article, thereby generating a second time series of position information;
• v) generating an augmented time series of position information by combining the first time series of position information and the second time series of position information;
• and
• vi) providing guidance to a user, based on the augmented time series of position information, for changing the relative position of the mobile device and the medical article in order to have the user bring the mobile device into a relative target position of the mobile device and the medical article.