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Screening for al-antitrypsin deficiency (AATD) can be performed with dried blood spots (DBS) on filter paper, which allows quantification of AAT by immunonephelometry (1), identification of the AAT phenotype by isoelectric focusing (2,3), and/or AAT genotyping (4).
Samples with verified wild-type AAT (PI MM) phenotype (n = 22) were first analyzed to establish a range of retention times for the wild-type AAT phenotype. The maximum absorbance within that range was then defined as PA AAT.