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Antibiotic resistance has been cited by the World Health Organisation (WHO) as one of the greatest threats to public health. Mitigating the spread of antibiotic resistance requires a multipronged approach with possible interventions including faster diagnostic testing and enhanced antibiotic stewardship. This study employs a low-cost diagnostic sensor test to rapidly pinpoint the correct antibiotic for treatment of infection. The sensor comprises a screen-printed gold electrode, modified with an antibiotic-seeded hydrogel to monitor bacterial growth. Electrochemical growth profiles of the common microorganism, <i>Escherichia coli</i> (<i>E. coli</i>) (ATCC 25922) were measured in the presence and absence of the antibiotic streptomycin. Results show a clear distinction between the <i>E. coli</i> growth profiles depending on whether streptomycin is present, in a timeframe of ≈2.5 h (<i>p</i> < 0.05), significantly quicker than the current gold standard of culture-based antimicrobial susceptibility testing. These results demonstrate a clear pathway to a low cost, phenotypic and reproducible antibiotic susceptibility testing technology for the rapid detection of <i>E. coli</i> within clinically relevant concentration ranges for conditions such as urinary tract infections.