ACR (urine albumin-creatinine ratio)

Description

Identifying and cleaning measured urine ACR (albumin-creatinine ratio) values in EHR data. Three codelists are provided: urine ACR, urine albumin and urine creatinine.

Rules

• Values associated with ACR codes should be used preferentially, and separate albumin and creatinine values used to calculate ACR where these are not available.

To note: steps 1-3 below should be carried out in this order to produce a standardised end result:

1. Remove values less than 0 and greater than 450 as these are implausible.
2. Apply additional cleaning rules based on unit codes where available.

3. If multiple values recorded on the same day for a patient, we take the mean.

4. Check to make sure the date is within the range expected given the data source and patient DOB and death dates.

Origins

• The origins of the SNOMED codelists were the Pathology Bounded Code List (PBCL).

Data

• Urine albumin-creatinine ratio SNOMED
• Urine albumin SNOMED
• Urine creatinine SNOMED