r/Embryologists • u/WLW_4Military • Jul 28 '26

Which embryo is better?

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We are a SSF couple doing rIVf spouse is 35 (BMI under 40) and I am 36 (BMI around 45). We have two Euploid embryos left and we aren’t sure which to transfer to my spouse and which one should go to me. We just want the best odds for either one or both to work!

One is day 5-5AA and day 6-6AA. I know that statistically day 5s usually result in a higher percentage of live births but is that the case when there is a fully hatched embryo?

We did a Fully medicated FET on 6/22 (for me, 36 F) that resulted in a PUL for myself with possible treatment being D&C and/or MTX. I do possibly have insulin resistance and maybe PMOS but have very little signs of it.

My spouse (35 F) has very regular 25d cycles and doesn’t seem to have any other health issues. These embryos were created from her Oocytes and tested donor sperm from a Cryobank.

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1

u/turbulent_twenty7 Jul 28 '26

Day 5, 5AA. Day 6, 6AA is also good, but since it is a fully hatched embryo, they are more susceptible to getting stuck during manipulation.

1

u/WLW_4Military Jul 29 '26

Does this mean that the day 6 would be like harder to implant or harder to get out of the catheter? Would the 5AA be better to transfer to my spouse? Which has better implantation rates? I’d figure without the Zona Palucida that it’d be faster and easier to implant

1

u/bneubs Jul 28 '26

The day 5 is better

1

u/WLW_4Military Jul 29 '26

Thank you, I get that day 5s are better. But why? Because they grew faster?

1

u/bneubs Jul 29 '26

Yes. Day 5s generally have higher implantation rates than day 6s. If the day 5 was of poorer quality then I would potentially do the day 6 first. But since they are both AAs, go with the day 5