In use, a test sample of {HEAD ~ blood} is contacted with the matrix of said test device and the light reflectance therefrom is measured as an indication of the quantitative amount of {TAIL ~ hemoglobin} present in said sample 
In use , a test sample of { HEAD ~ blood } is contacted with the matrix of said test device and the light reflectance therefrom is measured as an indication of the quantitative amount of { TAIL ~ hemoglobin } present in said sample
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH