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The measurement of total folate in clinical material became possible with the introduction of the Lactobacillus casei assay some 50 years ago. The use of lactoglobulin as a folate binding agent to measure folate by radioisotope dilution, later fluorimetry, is more user friendly but gives largely similar results.
The principal folate …
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.