Median Range CV % N Quota % Aß1-42 508 69-771 12 42 88 tTau 921 315-1292 13,3 42 86 pTau 181 66 53-83 9,6 34 97 This example was selected as the median concentration values [pg/mL] of the parameters are in the most relevant decision range between normal and pathological values in CSF. The coefficient of variation [CV], the number of participating laboratories and the success quota for the success interval [median ± 25%] are interpreted in the commentary of this survey [Nov 12, www.instand-ev.de]

Table 1: Inter-laboratory variation in the survey “Neurochemical dementia analysis” of INSTAND, Düsseldorf [survey Nov. 2012]

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