⁵¹Cr-Ethylenediaminetetraacetic Acid Absorption Test: Methodologic Aspects

Abstract

The ⁵¹Cr-ethylenediaminetetraacetic acid (EDTA) absorption test was evaluated in 83 healthy, male volunteers. Base-line 24-h excretion after peroral administration ranged from 0.88% to 7.96%, with a higher median absorption than reported by most authors (2.45%). However, the reproducibility and stability of the method and the reproducibility of the results were satisfactory. Urinary excretion after intraduodenal instillation (n = 18) was comparable to that seen after peroral test dose administration, indicating a limited significance of gastric ⁵¹r-EDTA absorption under normal conditions. In 16 subjects a single intake of alcohol immediately before the test gave a modest and short-lasting increase in ⁵¹Cr-EDTA absorption. No correlation was seen to body mass index, creatinine clearance, urinary volume, or small-bowel transit time, possibly reducing the number of confounding factors in the evaluation of absorption data. A small but significant negative correlation was, however, found to body surface area and age.

Key Words:

• [⁵¹Cr]ethylenediaminetetraacetic acid
• human intestinal permeability
• small bowel