Physical function (PF) is a strong predictor for length of stay, complications, readmission, and mortality amongpatients across different diagnoses. Still, systematic assessment of PF in hospitalised patients is not common, and if, only among the oldest. In this review, we suggest implementation of an easily applicable and validatedtest battery using the Cumulated Ambulation Score for basic mobility, Handgrip strength for general musclestrength, and the 30s Chair Stand Test for combined function and muscle strength for early identification andtreatment of reduced PF in adult patients across diagnoses.