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Test device and method for determining blood hemoglobin

  • US 4,057,394 A
  • Filed: 05/24/1976
  • Issued: 11/08/1977
  • Est. Priority Date: 05/24/1976
  • Status: Expired due to Term
First Claim
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1. A method for determining the hemoglobin content of blood, which comprises contacting a test device with 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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