Directional asymmetry (DA) was assessed across upper limb bones from a skeletal sample excavated at a medieval cemetery in Giecz, Poland, site Gz4. This study aimed to characterize sex differences in mechanical loading due to dominant limb use and, by extension, sexual division of labor in this population while addressing intraskeletal relationships in asymmetry. Archaeological evidence provided an agricultural behavioral context. Osteometrics for clavicles, humeri, and radii representing adult males (n=89) and females (n=53) were collected, and percent directional asymmetry (%DA) and absolute asymmetry (%AA) were calculated for 29 dimensions encompassing maximum lengths, midshafts, epiphyses, and articular surfaces. Across almost all variables for elements, there was significant sexual dimorphism, with males being larger than females. Furthermore, nearly all of the recorded measurements revealed some degree of asymmetry, with most demonstrating a right bias and the maximum length of the clavicle alone demonstrating a left-bias. Asymmetry was most pronounced in midshaft dimensions, and many metrics were weakly correlated. There were more correlations among dimensions within elements than between elements, and most of these involved midshaft dimensions. The general lack of sex differences in dimensions, especially in midshaft geometry, suggests that differential mechanical demands on each upper limb may have been similar between sexes. This finding contrasts the expectation that males would have engaged in more intensive unimanual activities than their female counterparts in this medieval setting. Similar trends in asymmetries across all three bones in the upper limb permit some degree of holism when assessing upper limb asymmetry. Interpretations presented here contribute to this narrative by filling in crucial information from Poland, addressing population-specific diversity.