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Excessive exposure to folic acid, a synthetic compound used in supplements and fortified foods, has also been linked to adverse health effects. Of at least three distinct laboratory markers of folate status, it is the total abundance of folate in serum\/plasma that is used by the majority of laboratories. The analysis of folate in red cells is also commonly performed. Since the folate content of red cells is fixed during erythropoiesis, this marker is indicative of folate status over the preceding ~4 months. Poor stability, variation in polyglutamate chain length and unreliable extraction from red cells are factors that make the analysis of folate challenging. The clinical use of measuring specific folate species has also been explored. 5-Methyltetrahydrofolate, the main form of folate found in blood, is essential for the vitamin B<jats:sub>12<\/jats:sub>-dependent methionine synthase mediated remethylation of homocysteine to methionine. As such, homocysteine measurement reflects cellular folate and vitamin B<jats:sub>12<\/jats:sub>use. When interpreting homocysteine results, age, sex and pregnancy, specific reference ranges should be applied. The evaluation of folate status using combined markers of abundance and cellular use has been adopted by some laboratories. In the presence of discordance between laboratory results and strong clinical features of deficiency, treatment should not be delayed. High folate status should be followed up with the assessment of vitamin B<jats:sub>12<\/jats:sub>status, a review of previous results and reassessment of folic acid supplementation regime.<\/jats:p>","DOI":"10.1136\/jclinpath-2018-205048","type":"journal-article","created":{"date-parts":[[2018,9,18]],"date-time":"2018-09-18T16:55:47Z","timestamp":1537289747000},"page":"949-956","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":85,"title":["Laboratory assessment of folate (vitamin B<sub>9<\/sub>) status"],"prefix":"10.1136","volume":"71","author":[{"given":"Agata","family":"Sobczy\u0144ska-Malefora","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominic J","family":"Harrington","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2018,9,18]]},"reference":[{"key":"2024053001305640000_71.11.949.1","doi-asserted-by":"crossref","first-page":"2645","DOI":"10.1096\/fasebj.5.12.1916088","article-title":"Compartmentation of folate-mediated one-carbon metabolism in eukaryotes","volume":"5","author":"Appling","year":"1991","journal-title":"Faseb J"},{"key":"2024053001305640000_71.11.949.2","unstructured":"Chanarin I . 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