24th June 2023

A 75-year-old woman attends her GP for a routine health check after recently moving to the country.

A 75-year-old woman attends her GP for a routine health check after recently moving to the country. She is found to have a creatinine of 190μmol/L on screening bloods (normal range 60-100μmol/L). The GP does not have access to any previous medical records and the patient is unsure of any previous test results.

What further result would suggest that the renal impairment is chronic rather than acute?