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. 2021 Aug 4;11:15791. doi: 10.1038/s41598-021-95305-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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AMA Assay characteristics and analyte stability. (A) Time-dependent product formation linearity with varying serum dilutions as source of human native PAM in assay. Product formation linearity of each dilution was verified with Runs Test. (B) Slopes from each serum dilution (A) were plotted against the volume of serum used in the assay. The 95% confidence interval is shown as dotted lines in (A) and (B). (C) Representative dose–response curve of enzymatic calibrator (bold line, closed circles) and interassay precision profile (empty circles) for the determination of PAM-AMA. Each point represents a mean of 16 measurements. (D) Stability analysis of native human PAM-AMA in serum as source of PAM. Activity of treated material was normalized to activity of untreated material that was set as 100%. (E) Spearman-correlation of PAM-AMA from matched serum and Li-heparin plasma samples (r = 0.89; p < 0.0001; n = 22).