The method uses NIR spectroscopy and a test element comprising a support, and a substantially constant light path defining layer comprising a diffusely reflecting material that is a) sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions, and b) homogeneously reflects {HEAD ~ at least 95%} of {TAIL ~ NIR radiation} 
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The method uses NIR spectroscopy and a test element comprising a support , and a substantially constant light path defining layer comprising a diffusely reflecting material that is a ) sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions , and b ) homogeneously reflects { HEAD ~ at least 95 % } of { TAIL ~ NIR radiation }
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