?:definition
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Reagents consisting of a substance that is established as a norm with which similar reagents used in immunoassay tests performed for the determination of one or more of a group of substances, which may be used to characterize anemia disorders present in the blood (e.g., erythropoietin, serum ferritin, folate), are compared. Standard reagents may be used to determine the purity or performance of the reagents used in those tests.
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