Abstract: Assessment of a respiratory condition of a subject, by acquiring a temporally varying hemodynamic waveform signal related to blood flow in a tissue; deriving from the hemodynamic waveform signal an evaluation of blood CO2; acquiring at least one more signal; and determining the medical condition based on the blood CO2 and the at least one more signal. A device for performing the assessment may include an implement disposable on the subject's skin and structured to acquire a temporally varying hemodynamic waveform signal and derive from the signal a blood CO2 value or a close approximation thereof; an oximeter disposable on the subject's skin and structured to provide an oxygen saturation value of the blood of the subject or a close approximation thereof; and an apparatus structured to evaluate the medical condition of the subject based on the blood CO2 and oxygen saturation or close approximations thereof.

Abstract: Assessment of a respiratory condition of a subject, by acquiring a temporally varying hemodynamic waveform signal related to blood flow in a tissue; deriving from the hemodynamic waveform signal an evaluation of blood CO2; acquiring at least one more signal; and determining the medical condition based on the blood CO2 and the at least one more signal. A device for performing the assessment may include an implement disposable on the subject's skin and structured to acquire a temporally varying hemodynamic waveform signal and derive from the signal a blood CO2 value or a close approximation thereof; an oximeter disposable on the subject's skin and structured to provide an oxygen saturation value of the blood of the subject or a close approximation thereof; and an apparatus structured to evaluate the medical condition of the subject based on the blood CO2 and oxygen saturation or close approximations thereof.

Abstract: A method for evaluating CO2 level in the blood of a patient, comprising detecting in the patient's body at least one haemodynamic signal from at least one tissue or part thereof, processing the at least one haemodynamic signal to derive a value related to the CO2 level of the patient and determining an evaluation of CO2 level of the patient based on a relation of the derived value to the CO2 level of the patient, and an apparatus to carry out the same.