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