'Substance P' in tears: Noninvasive test for diabetes-related nerve damage?

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Northerner

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Relationship to Diabetes
Type 1
Levels of a nerve cell signaling molecule called substance P -- measured in tear samples -- might be a useful marker of diabetes-related nerve damage (neuropathy), suggests a study in the July issue of Optometry and Vision Science, the official journal of the American Academy of Optometry. The journal is published by Wolters Kluwer.

Tear samples from patients with diabetes show elevated levels of substance P, which are related to early damage to the corneal nerves, which may contribute to the development of corneal ulcers and poor wound healing in patients with diabetes, according to the pilot study by Maria Markoulli, PhD, MOptom, FAAO, and colleagues of University of New South Wales, Sydney, Australia. They researchers suggest that substance P measurement could be a new and noninvasive test to assess the risk of diabetic neuropathy.

https://www.sciencedaily.com/releases/2017/07/170705151737.htm
 
Erm...couldn't you just occasionally check the Average BG, or HbA1c? It's not that invasive, after all.
 
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