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meathole t1_is0tm37 wrote

The cells are not taken from the embryo directly, they are taken from the Trophectoderm which is comprised of extra-embryonic tissue which does not become part of the fetus itself. Cells in the Trophectoderm become part of the support structure for the fetus like the placenta.

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Med_vs_Pretty_Huge t1_is10wzy wrote

Depends on the exact procedure. Blastomere biopsies are before that distinction.

EDIT: Had to edit my post because both blastomere and blastocyst biopsies happen on day 3 (blastomere in the early part of day 3, blastocyst later in day 3) but my overall point of "it depends on the exact nature of the test" is unchanged.

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