Mass spectral determination of fasting tear glucose concentrations in nondiabetic volunteers
Abstract
Background: There is considerable disagreement regarding the concentration of glucose in tears and its relationship to the concentration in blood. Improved sampling and analysis methods may resolve these discrepancies and possibly provide a basis for in situ tear glucose sensors. Methods: We used liquid chromatography (LC) with electrospray ionization mass spectrometry (ESI-MS) to determine glucose in 1-μL tear fluid samples obtained from 25 fasting study participants. Tear fluid was collected with microcapillaries and a slitlamp microscope. Results: The median (range) of fasting tear glucose concentrations was 28 (7–161) μmol/L or 0.50 (0.13–2.90) mg/dL. The SD of tear glucose measurements for individuals varied linearly with the mean tear glucose concentration and was approximately half of the mean. We found no significant difference in tear glucose concentrations between contact lens users and nonusers (P = 0.715). We observed significant correlations between fasting blood and tear glucose concentrations (R = 0.50, P = 0.01). Conclusions: Our tear fluid collection and analysis method enables reliable measurement of equilibrium, fasting tear glucose concentrations. These concentrations are lower than those previously reported for nondiabetic persons. Larger population studies are required to determine correlations between blood and tear glucose concentrations and to determine the utility of contact lens–based sensors for the monitoring of diabetes. Our methods are applicable for study of other tear fluid analytes and may prove useful for monitoring other disease states.
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Studies designed to establish correlations between blood and tear glucose concentrations are inconclusive from both human and animal studies.
“Studies designed to establish correlations between blood and tear glucose concentrations are inconclusive from both human (243-245) and animal studies (246).”
From Guidelines and Recommendations for Laboratory Analysis in the Diagnosis and Management of Diabetes Mellitus (2023) · cites this paper as [244]
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References 62 · Cited by 110
Research works printed but not linked: 6
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- Authors
- Baca, J. T., Taormina, C. R., Feingold, E., Finegold, D. N., Grabowski, J. J., & Asher, S. A.
- Affiliations
- University of Pittsburgh (US)
- Corresponding author
- Asher, Sanford A
- Venue
- Clinical Chemistry
- Publisher
- Oxford University Press (OUP)
- Published
- 2007-07-01
- Volume
- 53
- Issue
- 7
- Pages
- 1370-1372
- ISSN
- 0009-9147 (ISSN-L)
- 1530-8561
- OpenAlex
- W2032146310
- Semantic Scholar
- 0d587328717d626f9c824f010241a3008ac8de18
- Cited by
- 110
- References
- 62
- Citations by year
- 2025: 2 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 4 · 2020: 5 · 2019: 16 · 2018: 8 · 2017: 10 · 2016: 6 · 2015: 7 · 2014: 5 · 2013: 7 · 2012: 5
- FWCI
- 1.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- Clinical Chemistry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (DK-55348)
- Topics
- Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Ocular Surface and Contact Lens
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Keywords
- tear glucose, tears, fasting blood glucose, diabetes monitoring, tear sampling, interindividual variability
- MeSH terms
- Adolescent, Adult, Blood Glucose, Contact Lenses, Fasting, Glucose, Humans, Middle Aged, Reference Values, Tears, Spectrometry, Mass, Electrospray Ionization
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