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Table 2 The mean facial ultrasound markers of the euploid fetuses in our study during the second trimester

From: Utility of fetal facial markers on a second trimester genetic sonogram in screening for Down syndrome in a high-risk Thai population

GA (Weeks) PT (mm) NBL (mm) PT/NBL NBL/PT
14 1.83 3.86 0.48 2.27
15 2.17 4.57 0.47 2.21
16 2.47 4.97 0.5 2.11
17 2.71 5.36 0.51 2.06
18 2.88 5.91 0.49 2.14
19 3.22 6.06 0.53 1.93
20 3.49 6.15 0.57 1.82
21 3.6 6.38 0.56 1.83
22 3.75 6.5 0.58 1.78
  1. GA Gestational age (weeks), PT Prenasal thickness, NBL Nasal bone length