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HelpTest Code GHB Glycated Haemoglobin A1c (HbA1c)
Specimen Requirements
Specimen Type: Whole Blood (EDTA)
Container/Tube: Lavender Top
Volume: 3.0 mL
Minimum Volume: 2.0 mL
Specimen Stability
| Specimen Type | Whole blood (EDTA) |
|---|---|
| Ambient | 1 day |
| Refrigerate | 7 days (preferred) |
| Frozen | Reject |
Methodology
High Performance Liquid Chromatography (HPLC)
Days and Times Performed
Monday through Friday, TAT 1 - 3 days
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others: Frozen specimens | Reject |
Reference Interval
| HbA1c (NGSP) | (IFCC) | |
|---|---|---|
| 4.5 – 6.4% | 26 – 47 mmol/mol | Ideal |
| 6.5 – 7.0% | 48 – 53 mmol/mol | Optimal |
| 7.1 – 8.0% | 54 – 64 mmol/mol | Sub-optimal |
| > 8.0% | > 64 mmol/mol | Unacceptable |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724399
Useful For
Long term monitoring of glucose control in diabetes
Service Code
31939
LOINC Code Information
| HbA1c (%) | 17856-6 |
|---|---|
| HbA1c (mmol/mol) (NUHS) | 59261-8 |
Alias
GHB
Update
Last updated 24/02/2025