Fertility
What Is the Difference Between a Day 5 and Day 6 Embryo? - 5 min read
Short answer: A day 5 embryo and a day 6 embryo are usually both blastocysts. The difference is how quickly they reached that stage after fertilization. A day 5 blastocyst developed sooner; a day 6 blastocyst needed one additional day. Day 6 does not automatically mean poor quality, and transfer decisions should also consider chromosome screening, embryo grade, egg age, and the clinic laboratory's experience.…
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