13 April 2022>: Clinical Research
External Quality Assessment of Maternal Serum Levels of Alpha-Fetoprotein, Free Beta-Human Chorionic Gonadotropin, and Unconjugated Estriol in Detecting Down Syndrome and Neural Tube Defects in the Second Trimester of 87 Maternal Serum Samples, Based on 105-139 Days
Yiming Chen 12AEG** , Yijie Chen 2BE* , Yezhen Shi 3CD , Wenwen Ning 2BE , Xiaoying Wang 1B , Liyao Li 1BC , Huimin Zhang 2FDOI: 10.12659/MSM.935573
Med Sci Monit 2022; 28:e935573
Table 2 Correlation analysis of screening results between 5 screening laboratories and Laboratory A.
Laboratory/screening indicators | R value | The regression equation | P value | R2 |
---|---|---|---|---|
Lab B | ||||
AFP MoM | 0.996 | Y=−0.016+0.966X | 0.993 | |
free β-hCG MoM | 0.994 | Y=0.080+0.951X | 0.988 | |
uE3 MoM | 0.973 | Y=0.078+0.915X | 0.946 | |
Lab C | ||||
AFP MoM | 0.994 | Y=−0.016+0.966X | 0.987 | |
free β-hCG MoM | 0.994 | Y=0.080+0.951X | 0.988 | |
uE3 MoM | 0.966 | Y=0.078+0.915X | 0.932 | |
Lab D | ||||
AFP MoM | 0.995 | Y=−0.064+1.020X | 0.992 | |
free β-hCG MoM | 0.992 | Y=−0.065+1.080X | 0.994 | |
uE3 MoM | 0.967 | Y=0.138+0.877X | 0.935 | |
Lab E | ||||
AFP MoM | 0.999 | Y=0.010+0.916X | 0.998 | |
free β-hCG MoM | 0.998 | Y=−0.016+0.929X | 0.996 | |
uE3 MoM | 0.978 | Y=0.008+1.000X | 0.957 | |
Lab F | ||||
AFP MoM | 0.981 | Y=−0.136+0.824X | 0.962 | |
free β-hCG MoM | 0.993 | Y=−0.015+0.879X | 0.986 | |
uE3 MoM | 0.913 | Y=0.019+0.920X | 0.834 | |
Lab – laboratory; AFP – α-fetoprotein; free β-hCG – free beta human chorionic gonadotropin; uE3 – unconjugated estriol; MoM – multiple of median. |