In this article we discuss some ethically and legally controversial issues in the Swedish priority guidelines for intensive care during the recent covid pandemic. We show how the Swedish ethics platform for priority setting constitutes a robust starting point for such guidance, but that there is a lack of detail leaving some of the more challenging situations without explicit guidance. To provide guidance, which we have reason to do in order to avoid inequality and arbitrariness, we should try to interpret the ethics platform, based on how it is applied in practice together with ethical reasoning. In this article, we illustrate this by focusing on contested guidance concerning biological age when distributing scarce intensive care beds. We conclude that biological age should be interpreted in terms of long-term survival. We also conclude that the ethical platform does not provide guidance in these challenging situations, but needs interpretation. Therefore, there is a need of a legal overview of the principles in order to create an even stronger basis for support in the future