The goal of this clinical trial is to improve patient care after acute kidney injury (AKI). It has three related parts. The main questions it aims to answer are:
1. Is creatinine or cystatin a more reliable assessment of kidney function after AKI?
2. What are the experiences of patients after AKI?
3. What interventions should be recommended to improve assessment and support of patients after AKI?
Participants will be asked to do one or more of:
* blood tests to measure kidney function in different ways
* have measurement of their body composition
* complete questionnaires about their symptoms
* have an interview with a researcher about their experiences
* discussion to develop an action plan based on findings