RRID study glossary
| AKI | Acute Kidney Injury Not an actual injury but a sudden reduction in kidney function.  | 
|---|---|
| CKD | Chronic Kidney Disease A gradual decline in kidney function over time.  | 
| Prospective Cohort Study | A study to which participants are recruited and then data collected over time. | 
| Retrospective Cohort Study | A study which data previously collected for a defined group of patients.
 Retrospective studies have limitations as the subject data is historic and cannot be extended as the study develops. However, prospective studies require additional organisation; time has to elapse for the data to be collected and the participant cohort can diminish throughout the duration of the study.  | 
| Cohort | Group or sub-group of participants in a study. | 
| Primary care | Health care provided by your GP in the community. | 
| Secondary care | 
 Health care provided by the hospital.  | 
| Biomarker | Proteins in the blood and urine |