**6.4 Assessment of glycemic parameters in HF patients**

When dysglycemia in patients with HFrEF remains undiagnosed, it is hard to determine a solid prognosis [125]. As a solution, the 2019 ESC-EASD guidelines advise testing HbA1c and FPG levels for detecting diabetes in patients previously diagnosed with CVD [114]. Furthermore, if the aforementioned tests do not yield a concrete result, it is recommended to perform OGTT [114]. The 2021 ESC guidelines recommend to consistently check fasting glucose and HbA1c levels if chronic HF is suspected, to find its treatable causes and related comorbidities [91].
