In {TAIL ~ 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 the quantitative amount of hemoglobin present in {HEAD ~ said sample} 
In { TAIL ~ 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 the quantitative amount of hemoglobin present in { HEAD ~ said sample }
OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD