Regaining and maintaining balance requires postural reactions such as righting reactions, equilibrium reactions, and protective reactions. There is a lack of uniform, standardised, and reliable testing procedures for postural reactions. The aim of the present study was to examine the intra- And interrater reliability of a newly developed postural reactions assessment for use in people with acute stroke. Methods: The Postural Reactions Test was developed based on the literature, on previous tests, and on input from an expert panel. A total of 10 physiotherapists assessed a total of 20 video recordings of people with acute stroke performing each postural reaction. These assessments were carried out on two occasions at least 2 weeks apart. The study thus included 400 ratings. Findings: For intrarater reliability, the overall proportion of agreement was 86 - 93% for the different postural reactions. For interrater reliability, the most common score for each participant and the number of physiotherapists giving that score were noted. A median of 9-10 out of 10 physiotherapists scored the same value. Conclusions: The results indicate that the Postural Reactions Test can be used to reliably assess function in people with acute stroke and that the test can complement the existing assessments for people with affected postural control