A simple blood sample method for measuring oral zinc absorption in clinical practice

Area of Science:

• Biomedical science
• Nuclear medicine
• Gastroenterology

Background:

• Zinc absorption is crucial for overall health.
• Crohn's disease can significantly impair nutrient absorption, including zinc.
• Accurate zinc absorption measurement is vital for managing Crohn's disease patients.

Purpose of the Study:

• To compare zinc absorption measured by blood tracer activity versus whole-body counting.
• To evaluate the predictive accuracy of blood tracer activity for zinc absorption in controls and Crohn's disease patients.
• To determine the utility of the blood tracer technique as an alternative to whole-body counting.

Main Methods:

• Oral administration of zinc-65 tracer.
• Measurement of blood tracer activity 14 days post-ingestion.
• Comparison with zinc absorption data obtained via whole-body counting.
• Analysis of correlations and predictive accuracy in control and Crohn's disease groups.

Main Results:

• Significant linear correlations (P < 0.001) were found between blood tracer activity and zinc absorption in both groups.
• Zinc absorption was predicted with high accuracy: +/- 7.1% (controls), +/- 17.1% (active Crohn's), +/- 18.0% (quiescent Crohn's).
• The blood tracer method demonstrated ~88% sensitivity, ~89% specificity, and ~88% overall accuracy compared to whole-body counting.

Conclusions:

• Blood tracer activity is a reliable predictor of zinc absorption.
• This technique offers a practical alternative to whole-body counting, especially where facilities are limited.
• The findings support the use of blood tracer analysis for assessing zinc status in Crohn's disease.