The method uses NIR spectroscopy and {HEAD ~ a test element} comprising {TAIL ~ 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 at least 95% of NIR radiation 
The method uses NIR spectroscopy and { HEAD ~ a test element } comprising { TAIL ~ 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 at least 95 % of NIR radiation
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH