Multicenter evaluation of the first automated Elecsys sFlt-1 and PlGF assays in normal pregnancies and preeclampsia

J Schiettecatte, Henk Russcher, E Anckaert, Marlies Mees, B Leeser, AS Tirelli, GM Fiedler, H Luthe, B Denk, J Smitz

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Abstract

Objectives: Performance evaluation of Elecsys sFlt-1 and PIGF assays. Design and methods: Within-, between-run, total imprecision, functional sensitivity, inter-laboratory comparison, method comparison and lot-to-lot reproducibility were evaluated. Results: Within- and between-run CVs were below 4% for sFlt-1 >60 and PIGF >20 pg/mL Total imprecision CVs were below 4.3%. Functional sensitivity was <5 pg/mL. Inter-laboratory CVs were <5%. Elecsys correlated well with Quantikine VEGF-R1 (r = 0.960) and PIGF (r = 0.968). Lot-to-lot comparisons yielded highly correlated results (r>0.999). In healthy pregnancies, the median levels of sFlt-1 remained constant in first (1107 pg/mL) and second trimesters (1437 pg/mL) but increased in the third trimester (2395 pg/mL), while median PIGF levels increased in the first (30 pg/mL) and second trimesters (279 pg/mL) and peaked at 29 to 32 weeks (626 pg/mL) and decreased thereafter (340 pg/mL). The sFlt-1/PIGF ratio is highest in the first trimester (median: 28) but remained constant in the second (median: 4.7) and third trimesters (median: 5.1). In PE/HELPP samples matched for gestational age the sFlt-1 levels were significantly higher (6894-34,624 pg/mL), whereas PlGF levels were lower (9.2-80 pg/mL) and the median sFlt-1/PIGF ratio is much higher (461; range: 121-2614) than in apparently healthy pregnancies (3.6; range: 0.3-105). Conclusion: The new Roche Elecsys sFlt-1 and PIGF immunoassay showed excellent precision and reliability. There was a clear difference in the Elecsys sFlt-1/PIGF ratio between samples obtained from women with apparently normal pregnancy at the time of blood collection and those diagnosed with PE/HELLP at the same age of gestation. (C) 2010 The Canadian Society of Clinical Chemists. Published by Elsevier inc. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)768-770
Number of pages3
JournalClinical Biochemistry
Volume43
Issue number9
DOIs
Publication statusPublished - 2010

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