Family planning clinics, including those that provide abortion, are the backbone of sexually transmitted infection (STI) testing in the US. Rates of STIs are rising nationally, with long term health consequences like pelvic inflammatory disease and infertility for individuals who go untreated. Abortion care provision in the US has shifted preceding, and after, the Dobbs v Jackson Women’s’ Health Organization decision. Some may forgo abortion care due to constrained physical access to care, while others may access care outside brick-and-mortar clinics through self-managed abortion and telemedicine. Constrained access to, and decreased utilization of, in-person abortion care—where additional testing like STI screening is more feasible—may be associated with rising STI rates. Should abortion restrictions prove recalcitrant to repeal, shifts in abortion care will likely remain. As such, there is an urgent public health need to examine the causal relationship between shifting abortion provision and STI rates nationally. Through an empirical design that will assess differential effects across care delivery environments, this study will specifically determine 1) whether the reduced physical access to abortion clinics is associated with rising STI rates and 2) attend to whether the Dobbs decision resulted in differences in STI rate change across states.