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Person—glycosylated haemoglobin level (measured), percentage N[N].N

Data Element Attributes

Identifying and definitional attributes

Metadata item type:Help on this termData Element
Short name:Help on this termGlycosylated haemoglobin level (measured)
METEOR identifier:Help on this term270325
Registration status:Help on this term
  • Health, Standard 01/03/2005
Definition:Help on this termA person's glycosylated haemoglobin (HbA1c) level, measured as percentage.
Data Element Concept:Help on this termPerson—glycosylated haemoglobin level

Value domain attributes

Representational attributes

Representation class:Help on this termPercentage
Data type:Help on this termNumber
Format:Help on this termN[N].N
Maximum character length:Help on this term3
Supplementary values:Help on this term
ValueMeaning
99.9Not stated/inadequately described

Data element attributes

Collection and usage attributes

Guide for use:Help on this term

HbA1c results vary between laboratories; use the same laboratory for repeated testing.

When reporting, record absolute result of the most recent HbA1c level in the last 12 months.

Record the absolute result of the test (%).

Collection methods:Help on this term

Test is performed in accredited laboratories:

  • A single blood sample is sufficient and no preparation of the patient is required.
  • Measure HbA1c ideally using High Performance Liquid Chromatography (HPLC).

Source and reference attributes

Submitting organisation:Help on this termNational diabetes data working group
Origin:Help on this termNational Diabetes Outcomes Quality Review Initiative (NDOQRIN) data dictionary.
Reference documents:Help on this termKoening, R. J. Peterson, CM and Kilo, C et al. Hemoglobin A1c as an indicator of the degree of glucose intolerance in diabetes. Diabetes 259 (1976): 230-232. Nathan, D.M., Singer, D.E, Hurxthal, K, and Goodson, J.D. The clinical information value of the glycosylated hemoglobin assay. N. Eng. J. Med. 310 (1984): 341-346.

Relational attributes

Related metadata references:Help on this term
Is re-engineered from PDF Glycosylated Haemoglobin (HbA1c) - measured, version 1, DE, NHDD, NHIMG, Superseded 01/03/2005.pdf (18.0 KB) No registration status
See also Laboratory standard—upper limit of normal range of glycosylated haemoglobin, percentage N[N].N
  • Health, Standard 01/03/2005
Implementation in Data Set Specifications:Help on this term
All attributes +
Acute coronary syndrome (clinical) DSS
Health, Superseded 01/09/2012

Acute coronary syndrome (clinical) DSS
Health, Superseded 02/05/2013

Acute coronary syndrome (clinical) NBPDS 2013-
Health, Standard 02/05/2013
DSS specific attributes +
Implementation start date: 01/07/2013

Diabetes (clinical) DSS
Health, Superseded 21/09/2005

Diabetes (clinical) NBPDS
Health, Standard 21/09/2005
DSS specific attributes +
DSS specific information:

The HbA1c along with regular blood glucose monitoring is the best way to see the overall picture of blood glucose levels.

HbA1c is a measurement of long-term blood glucose control and is used to assess the effectiveness of treatment. The level of HbA1c is proportional to the level of glucose in the blood over a period of approximately two months, because glucose attaches to the haemoglobin (red blood cells) and remains there for the life of the red blood cell, approximately 120 days. The HbA1c gives an average of the blood glucose level over the past 6-8 weeks and therefore HbA1c is accepted as an indicator of the mean daily blood glucose concentration over the preceding two months.

HbA1c is formed by the non-enzymatic glycation of the N-terminus of the B- chain of haemoglobin Ao. It is a convenient way to obtain an integrated assessment of antecedent glycaemia over an extended period under real life conditions used as a standard for assessing overall blood glucose control.

Research studies in the United States have found that for every 1% reduction in results of HbA1c blood tests, the risk of developing micro vascular diabetic complications (eye, kidney, and nerve disease) is reduced by 40 percent.

The maintenance of good glycaemic control (in diabetes Type 1 and Type 2), significantly reduces progression of diabetes-related complications such as retinopathy, nephropathy and neuropathy, as indicated in the Diabetes Control and Complications Trial (DCCT 1993) and United Kingdom Prospective Diabetes Study (UKPDS 1997).

The target proposed by the Australian Diabetes Society for glycosylated haemoglobin (HbA1c)is 7.0% or less and a doctor may order this test about every 3 - 6 months.


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