prokomentiruyote, pozh-hundred, results of US on term 18 ned. +3 days: BPR 46...

[Vika]

prokomentiruyote, pozh-hundred, results of US on term 18 ned. +3 days:
BPR 46 mm, OkrZH 138 mm, OkrG 173 mm, DB 28 mm TSef. An index 71 (N).
I am am confused with perimeter of a head. According to one table he corresponds or meets 20 ned. Why there can be such deviation or rejection of the size? On 16 ned. Handed over blood AFP 35 ng/ml, HGCH 70 me/ml. Thanks!

[Pasenjuk A.M.]

BPR and OG sootvetsvujut it is valid to average value or meanings;importance at 20 weeks, probably it is a variant of norm or rate for vashegorebenka, the hydrocephalus is probably formed.