| butanol-extractable iodine | Iodine that can be separated from plasma proteins by butanol or other extractable solvents; used to measure thyroid function. (05 Mar 2000) |
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| butanol-extractable iodine test | An obsolete test for thyroid function, applicable in patients who have received large amounts of iodine or iodised products. Synonym: BEI test. (05 Mar 2000) |