A method for determining the hemoglobin content of blood, which comprises contacting {HEAD ~ a test device} with {TAIL ~ a sample} of blood and measuring light at 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 
with
A method for determining the hemoglobin content of blood , which comprises contacting { HEAD ~ a test device } with { TAIL ~ a sample } of blood and measuring light at 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
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