Early intravenous fluid administration remains one of the modern pillars of sepsis treatment, however, questions regarding amount, type, rate, mechanism of action and even the benefits of fluid remain unanswered. Administering the optimal fluid volume is important as overzealous fluid resuscitation can precipitate multiorgan failure, prolong mechanical ventilation and worsen patient outcomes. After the initial resuscitation, further fluid administration should be determined by individual patient factors and measures of fluid responsiveness. This review describes various static and dynamic measures that are used to assess fluid responsiveness and summarizes the evidence addressing these metrics. Subsequently, we outline a practical approach to the evaluation of fluid responsiveness in early septic shock and explore further areas crucial to ongoing research examining this topic.