Ames Reflectance Meter

The Ames Reflectance Meter was the first blood glucose meter. It allowed patients with diabetes to self-monitor their blood glucose levels.

Ames Reflectance Meter
Purposepatients with diabetes to self-monitor

The Ames Reflectance Meter was developed in 1970 by Anton H. Clemens. It had a needle that indicated the intensity of blue light reflected from a paper strip, called Dextrostix. The meter gave a quantitative number that was correlated with glucose levels in blood that the Dextrostix was exposed to.[1]

The Dextrostix was developed about a decade earlier. It was a paper strip with chemistry immobilized onto it. When the paper strip was dipped into blood, it changed color to a shade of blue. The exact shade of blue was dependent on the level of glucose in the blood.[2]

The meter weighed about 3 pounds and sold for $650. It was initially marketed to physician's offices, not patients. One man with diabetes, Richard K. Bernstein, managed to buy one because his wife was a physician. He used the machine to map out the daily fluctuations in his blood glucose levels. This knowledge allowed him to manage his diet and insulin injections better to maintain steady, normal blood glucose levels.

References
  1. Tonyushkina, Ksenia; Nichols, James H. (2009). "Glucose Meters: A Review of Technical Challenges to Obtaining Accurate Results". Journal of Diabetes Science and Technology. 3 (4): 971–980. doi:10.1177/193229680900300446. PMC 2769957. PMID 20144348.
  2. Harvey, D. R.; Cooper, L. V.; Fancourt, R. F.; Levene, M.; Schoberg, T. (1976). "The use of dextrostix and dextrostix reflectance meters in the diagnosis of neonatal hypoglycemia" (PDF). Journal of Perinatal Medicine. 4 (2): 106–110. doi:10.1515/jpme.1976.4.2.106. PMID 966130.
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