Although the FPI and PRQ are valid and reliable instruments for the assessment of infertilityrelated stress and perceived social support in Western countries, the instruments have never been tested in the Thai population. It was reassuring that the Cronbach alpha coefficients of the translated instruments showed good internal consistency. Nevertheless, this does not imply that the original and the Thai versions of the instruments were equivalent. Some items in the instruments might have different meanings and importance in different populations. It is, therefore, possible that cross-cultural differences will have distorted the results of the present study