A method for determining the hemoglobin content of blood, which comprises contacting a test device with a sample of {HEAD ~ blood} and measuring light at {TAIL ~ a wavelength} of between about 300 and about 620 nanometers which is reflected from said test device, wherein said test device comprises a substantially opaque, light reflective, blood absorbent matrix having a refractive index of less than about 1.0 or above about 1.7 
A method for determining the hemoglobin content of blood , which comprises contacting a test device with a sample of { HEAD ~ blood } and measuring light at { TAIL ~ a wavelength } of between about 300 and about 620 nanometers which is reflected from said test device , wherein said test device comprises a substantially opaque , light reflective , blood absorbent matrix having a refractive index of less than about 1.0 or above about 1.7
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 OTH OTH OTH OTH 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