Clinical Chemistry
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Clinical Chemistry 53: 1370-1372, 2007. First published May 10, 2007; 10.1373/clinchem.2006.078543
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(Clinical Chemistry. 2007;53:1370-1372.)
© 2007 American Association for Clinical Chemistry, Inc.

Technical Briefs

Mass Spectral Determination of Fasting Tear Glucose Concentrations in Nondiabetic Volunteers

Justin T. Baca1, Christopher R. Taormina1, Eleanor Feingold3, David N. Finegold2, Joseph J. Grabowski1 and Sanford A. Ashera,1

1 Department of Chemistry, University of Pittsburgh, Pittsburgh, PA;
2 Department of Pediatrics, University of Pittsburgh School of Medicine, Children’s Hospital of Pittsburgh, Pittsburgh, PA;
3 Department of Human Genetics and Department of Biostatistics, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA;

aaddress correspondence to this author at: Department of Chemistry, Chevron Science Center, 219 Parkman Ave., Pittsburgh, PA 15260; fax 412-624-0588, e-mail asher{at}pitt.edu


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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Copyright © 2007 by the American Association for Clinical Chemistry.