Fetal Humerus Normal Measurements

Fetal Humerus The humerus is considered shortened if it is more than 2 standard deviations below that expected for gestational age. This is a marker for Trisomy 21. The table below indicates the -2 Standard deviation measurement for completed weeks of gestation. Completed Weeks -2SD in mm 11 5 12 7 13 8 14 10 15 11.5 16 17 17 20 18 21.5 19 24 20 26 21 26 22 29 23 34 24 34 25 38 26 40 27 43 28 45 29 46 30 47 31 49 32 51 33 51 34 53.5 35 54 36 57 37 57 38 58 39 59.5 40 60 41 62

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