胚胎內部PH值約7.1-7.2
胚胎培養液PH值各種廠牌不一，平均約7.3 (7.2-7.4)

http://humupd.oxfordjournals.org/content/18/3/333.long

Is there an optimal pH for culture media used in clinical IVF?

Table III

Recommended pHe values for various commercial IVF media (adapted from Swain, 2010).

Company	Medium	Recommended pHe
Cook	Sydney IVF Cleavage	7.3–7.5
	Sydney IVF Blastocyst	7.3–7.5
	Sydney IVF Fertilization	7.3–7.5
FertiPro	FertiCult™ IVF	7.2–7.6
	FertiCult™ G3	7.3–7.6
Gynemed	GM501 Basic	7.2–7.45
	GM501 Cult	7.2–7.45
InVitroCare	IVC-ONE™	7.25–7.45
	IVC-TWO™	7.25–7.45
	IVC-THREE™	7.25–7.45
Irvine	P1®	7.27–7.32
	ECM®	7.2–7.25
	SSM™	7.28–7.32
	MultiBlast®	7.3–7.4
	HTF	7.2–7.3
Life Global	global®	7.2–7.4a
	global® for Fertilization	7.2–7.4a
	Blastocyst	7.2–7.4a
	HTF	7.2–7.4a
	HTFxtra	7.2–7.4a
Origio	Universal IVF	7.3–7.4
	ISM1™	7.2–7.3
	ISM2™	7.35–7.45
	EmbryoAssist ™	7.2–7.3
	BlastAssist®	7.35–7.45
	EmbryoGen®	7.2–7.3
Sage	Quinns Advantage® Fert	7.3 ± 0.1
	Quinns Advantage® Cleavage	7.2 ± 0.1
	Quinns Advantage® Blastocyst	7.3 ± 0.1
Vitrolife	G-IVF™ (G5-Series)	7.35 ± 0.1
	G-1™ (G5 Series)	7.27 ± 0.07
	G-2™ (G5 Series)	7.27 ± 0.07

• ^aCompany recommends 7.3.