Chronic Kidney Disease stage (composite)
Name ckdstage_composite
Chapter Genitourinary system diseases/Renal failure
Definition
Chronic kidney disease stage composite (based on recorded CKD stage, other renal disease diagnoses and eGFR estimated from serum creatinine)

Note: CKD stages 1 and 2 cannot be diagnosed on the basis of GFR alone; there must be evidence of kidney damage. CKD stage obtained from eGFR and from GP-entered CKD stage may be different because the diagnosis of CKD stage may be based on hospital creatinine measurements and ignores acute kidney injury. Also the GP diagnosis based on lab-calculated eGFR from standardised creatinine may differ from GPRD estimates which do not take into account whether the assay is standardised.

Defined for a specified date for each patient.
Data Type Categorical
Data sources GPRD
Dictionaries Read
Repeated No
Valid event date range 01/01/1900 - 25/03/2010
Agreed 08/11/2012 (Revision 1)
Category Definition
0 Missing
1 CKD stage 1
2 CKD stage 2
3 CKD stage 3
4 CKD stage 4
5 CKD stage 5
6 Normal
Implementation
Defined for a specified date for each patient.

IF any record of ckdstage_gprd prior to the specified date, ckdstage_composite = ckdstage_gprd;

ELSE IF OR dialysis_gprd = 1 OR dialysis_opcs = 1 on or before specified date, ckdstage_composite = 5;

ELSE IF egfr_ckdepi recorded on or before specified date, THEN calculate the CKD stage from the most recent egfr_ckdepi: {

IF egfr_ckdepi >= 90 ml/min AND (proteinuria_composite = 1 on or before specified date OR nephritic_nephrotic_gprd = 1 or 2 on or before specified date), ckdstage_composite = 1;

ELSE IF egfr_ckdepi 60-89 ml/min AND (proteinuria_composite = 1 on or before specified date OR nephritic_nephrotic_gprd = 1 or 2 on or before specified date), ckdstage_composite = 2;

ELSE IF egfr_ckdepi 30-59 ml/min, ckdstage_composite = 3;

ELSE IF egfr_ckdepi 15-29 ml/min, ckdstage_composite = 4;

ELSE IF egfr_ckdepi <15 ml/min, ckdstage_composite = 5;

ELSE IF most recent egfr_ckdepi >= 60 ml/min, ckdstage_composite = 6

}

ELSE ckdstage_composite = 0
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Creation date
Category (code) Read code Read term CPRD Medcode
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