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HelpTest Code GLUF Glucose, serum, fasting
Laboratory Code
LAB81
Specimen Requirements
Submit only one of the following:
Preferred
Specimen Type: Plasma
Container/Tube: Grey Top (Sodium Fluoride/Potassium Oxalate)
Volume: 4.5 mL
Minimum Volume: 0.5 mL plasma
Collection Instructions: Fast patient 10-12 hours before sample collection. Mix specimen well to avoid clotting. Centrifuge within 2 hrs.
Acceptable
Specimen Type: Serum/Plasma
Container/Tube: Gold Top (SSTII) / Green Top (Li Heparin/PST)
Volume: 5.0 mL / 4.5 mL
Minimum Volume: 0.5 mL serum/plasma
Collection Instructions: Fast patient 10-12 hours before sample collection. Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Plasma (Stabilized with sodium fluoride/potassium oxalate) |
|---|---|
| Ambient | 2 days |
| Refrigerate | 7 days |
| Frozen | 3 months |
Methodology
Enzymatic Assay
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
4.0 – 6.0 mmol/L
Critical value: < 2.5 or > 20.0 mmol/L
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of carbohydrate metabolic status.
Diagnosis of diabetes mellitus and hypoglycaemia.
Service Code
31117
LOINC Code Information
14771-0
Alias
GLUFS
Update
Last updated 11/03/2025