T2* relaxometry has been proposed as a semi-quantitative measure for placental oxygen transport. However, to use T2* as a diagnostic tool, it is necessary to define the normal range of results and factors that influence those results. In this study we investigated the effect of maternal position, breath-holds and oxygen state on placental T2*. We observed lower T2* with breath-hold protocol compared to no breath-hold protocol in left lateral position. Additionally, lower T2* was measured in supine position during normoxic episode compared to left lateral position with no breath-hold protocol. Further studies are needed to understand these factors better.