Glycosylated Haemoglobin
Name HbA1c
Chapter Endocrine, nutritional, metabolic/Diabetes
Definition
IFCC equivalent glycosylated haemoglobin (HbA1c) level in mmol/mol. Values in % are converted to mmol/mol. The distribution of values with missing units is similar to those in % so they are converted using the same formula.
Data Type Continuous
Data sources GPRD
Repeated Yes
Units mmol/mol
Range (min/max) 20-180
Valid event date range 01/01/1900 - 25/03/2010
Agreed 17.01.2014 (Revision 2)
Implementation
IF enttype = 275 OR (Read code in HbA1c code list AND enttype = 288) THEN:
    IF data3 = 1 [%] or 0 [missing] THEN HbA1c = (data2 - 2.15) * 10.929
    ELSE IF data3 = 97 [mmol/mol] THEN HbA1c = data2

SET HbA1c = missing IF HbA1c < 20 OR HbA1c > 180
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Category (code) Clinical code Clinical term Datasource lookup
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