the invention relates to a transcutane, bloodless in vivo konzentrationsbestimmung of patientenblut specific substances, such as glucose, lactate, glucose, cholesterol, alcohol, drugs or the like, in the $a (a) a quantity of a substance and the water quantity of a given ku00f6rperr egion signal through the spektroskopischer methods is generated is measured.$a (b) concentration in the water by verhu00e4ltnisbildung of signalwertes substance and water quantity is determined, and $a (c) in the concentration of the substance in the blood is calculated.
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