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David Qiuping Peng: There Is Maybe a Blastocyst Maturation-Competence Theory
Photo: DepositPhotos
Sep 27, 2026, 13:39

David Qiuping Peng: There Is Maybe a Blastocyst Maturation-Competence Theory

David Qiuping Peng, Clinical Embryologist, Researcher at Create Fertility Clinic and Author of “Senior IVF Lab Procedures”, shared on LinkedIn:

“There Is Maybe a Blastocyst Maturation-Competence Theory

Based on our previous viewpoints, we like to propose a Blastocyst Maturation-Competence Theory:

A blastocyst needs to reach full maturity, with its structure and functions – somewhat like a fetus benefiting from reaching full term.

A fully developed blastocyst, including the maturation of its cell membranes and intercellular matrix, etc. may be better prepared for vitrification, warming, implantation, and continued development.

1. The Role of the ZP

The ZP may need to maintain sufficient integrity to preserve the pressure inside the blastocoel. This internal pressure may play an important role in blastocyst maturation.

2. Blastocoel Pressure and TSCC

The pressure inside the blastocoel may represent a natural form of TSCC (Temporary Suboptimal Culture Conditions). A mild and temporary stress may promote the elimination of abnormal cells (genetic or chromosomal abnormalities), while normal cells may be better able to tolerate the stress.

Possible examples of TSCC could include approximately 34°C and slightly lower pH for hours, etc. TSCC may provide a simple approach to identify blastocysts with euploidy or genetic normality.

3. Timing of Vitrifacation and Biopsy

A blastocyst may benefit from reaching approximately mid-stage 4 or later before vitrification. For TE biopsy, the blastocyst may ideally reach late stage 4 to early stage 5, when ZP is thinnest, often around Day 6.

4. A Possible Explanation for NIPGS

One possibility is that the cell-free DNA detected by NIPGS may come from abnormal cells undergoing apoptosis and releasing DNA into the culture medium. Therefore, the amount and characteristics of cell-free DNA may contain useful information about the embryo.

5. Combining Cell-Free DNA Quantity with TSCC

Detecting the amount of cell-free DNA may potentially increase the value of NIPGS.

One possible future approach could be to combine a mild or half-dose TSCC with NIPGS to help rank blastocysts.

A mild TSCC may allow normal cells to survive while promoting apoptosis in some abnormal cells. This could potentially increase the amount of detectable DNA.

With further research and validation, this approach may eventually help develop a more standardized method for blastocyst assessment.

6. Granularity of the Blastocyst

After abnormal cells undergo apoptosis, cellular debris or small particles may remain attached to the cells. This process may contribute to the granular appearance observed in blastocysts.

7. Four-Hour Post-Warming Hatching as a QC Indicator

If a blastocyst is fully mature and laboratory procedures are performing well, a mature blastocyst may be expected to show hatching approximately 4 hours after warming.

Therefore, the 4-hour post-warming hatching status may potentially serve as a comprehensive IVF skills quality-control indicator, reflecting both blastocyst maturity and laboratory performance.”

David Qiuping Peng

Other articles featuring David Qiuping Peng on Fertility News.

biopsy Blastocoel Pressure blastocyst Blastocyst Maturation Blastocyst Maturation-Competence Theory Fertility Fertility News Granularity IVF NIPGS OBGYN QC Indicator reproductive health Reproductive Medicine Temporary Suboptimal Culture Conditions Timing of Vitrifacation TSCC Women’s Health ZP
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