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Human Reproduction, Vol 13, 624-629, Copyright © 1998 by Oxford University Press

ARTICLES

The predictive value of the zona-free hamster egg penetration test in relation to in-vitro fertilization at various insemination concentrations

MR Zainul Rashid, SB Fishel, S Thornton, JA Hall, G Ndukwe, M Aloum and SD Fleming
Nottingham University Research and Treatment Unit in Reproduction, School of Human Development, Department of Obstetrics and Gynaecology, Queen's Medical Centre, UK.

The aim of the study was to evaluate the predictive value of the zona- free hamster egg penetration test (ZHEPT) for success in in-vitro fertilization (IVF) at various insemination concentrations ranging between 0.1 and >0.6 x 10(6)/ml. The ZHEPT was assessed using sperm samples from 87 couples undergoing IVF treatment. A similar test was simultaneously performed on the same semen sample following ionophore induction of the acrosome reaction (ZHEPTii test). Both the tests were poorly correlated with the fertilization rate of IVF at all the insemination concentrations except at >0.6 x 10(6)/ml, when there was good correlation between the ZHEPTii test and the fertilization rate. Following exclusion of two cases with an oocyte problem, further statistical analysis revealed that both the ZHEPT and ZHEPTii tests were poorly correlated with fertilization rate in IVF in this treatment group. This study suggests that the ZHEPT (with and without ionophore induction of the acrosome reaction) has a poor predictive value for the success of fertilization in IVF treatment at any insemination concentration.
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