UKRDC Dataset
EDTA/EDTA2 mappings
Overview
This page documents key considerations and caveats related to the EDTA ↔ EDTA2 mappings.
Current Mapping
The current EDTA → EDTA2 and EDTA2 → EDTA mappings can be found here:
resources/codes/code_conv_lists at master · renalreg/resources
Caveat: Not all EDTA → EDTA2 mappings have an exact reverse match, see table below.
The table lists EDTA → EDTA2 mappings (forward) and the corresponding EDTA2 → EDTA mappings (reverse).
EDTA | EDTA description | EDTA2 | EDTA2 description | EDTA |
|---|---|---|---|---|
20 | PYELO/INTERSTITIAL NEPHRITIS - CAUSE NOT SPECIFIED | 1602 | Primary reflux nephropathy - sporadic | 24 |
21 | PYELO/INTERSTITIAL NEPHRITIS - WITH NEUROGENIC BLADDER | 1706 | Congenital neurogenic bladder | 99 |
22 | PYELO/INTERSTITIAL NEPHRITIS - CONGEN. OBST. UROPATHY +/- REFLUX | 1673 | Congenital vesico-ureteric junction obstruction | 99 |
29 | PYELO/INTERSTITIAL NEPHRITIS DUE TO OTHER CAUSE (PLEASE SPECIFY) | 3555 | Chronic kidney disease (CKD) / chronic renal failure (CRF) - aetiology uncertain / unknown - no histology | 0 |
49 | CYSTIC KIDNEY DISEASE - OTHER SPECIFIED TYPE | 2794 | Cystic kidney disease | 40 |
50 | HEREDITARY/FAMILIAL NEPHROPATHY - TYPE UNSPECIFIED | 3379 | Familial nephropathy | 59 |
63 | CONGENITAL RENAL DYSPLASIA +/- URINARY TRACT MALFORMATION | 1625 | Congenital dysplasia / hypoplasia | 60 |
70 | RENAL VASCULAR DISEASE - TYPE UNSPECIFIED | 2430 | Atheroembolic renal disease - no histology | 75 |
76 | GLOMERULONEPHRITIS RELATED TO LIVER CIRRHOSIS | 1159 | IgA nephropathy secondary to liver cirrhosis - no histology | 10 |
79 | RENAL VASCULAR DISEASE - CLASSIFIED (PLEASE SPECIFY) | 2411 | Ischaemic nephropathy / microvascular disease - histologically proven | 75 |
89 | MULTI-SYSTEM DISEASE - TYPE UNSPECIFIED | 3555 | Chronic kidney disease (CKD) / chronic renal failure (CRF) - aetiology uncertain / unknown - no histology | 0 |
93 | NEPHROCALCINOSIS / HYPERCALCAEMIC NEPHROPATHY | 3555 | Chronic kidney disease (CKD) / chronic renal failure (CRF) - aetiology uncertain / unknown - no histology | 0 |
99 | OTHER IDENTIFIED RENAL DISORDERS - PLEASE SPECIFY | 3691 | Renal failure | 0 |
Considerations
The current mappings are pragmatic rather than perfect, designed to work for most use cases without complex adjustments.
Attempting a precise one-to-one mapping between EDTA and EDTA2 may not be feasible due to inconsistencies in the code sets.
Alternative Approach
An alternative strategy would be to map both EDTA and EDTA2 codes directly into broader categories used in annual reporting (5–10 categories). Advantages include:
Avoiding imperfect mappings between EDTA and EDTA2.
Simplifying future classification of unconstrained code lists (e.g., SNOMED codes submitted by centres) by mapping directly to analysis categories rather than hundreds of EDTA codes.
Maintaining consistency in analysis while reducing mapping complexity.
In most cases, this approach yields similar results for reporting purposes and may be more sustainable long-term.
Next Steps
Consider using broader category mapping for future data submissions to simplify integration and reporting.