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Items starting with G

Gamma Glutamyl Transferase (GGT)

Gamma Glutamyl Transferase (GGT)

Reference Range

Males:   11-59 IU/L
Females: 8-33 IU/L

Higher levels can be seen in neonates, smokers and in women taking oral contraceptives.

  • Turnaround Time: 1 day
Glandular Fever - GF

Glandular Fever - GF

  • Turnaround Time: 24 hours
Glucose (CSF)

Glucose (CSF)

Reference Range

Adults: 2.0 - 5.0 mmol/L

Results should be interpreted in relation to concurrent plasma values (the CSF glucose concentration should be 60% of the plasma glucose concentration).

  • Turnaround Time: 1 day
Glucose (Serum/Plasma)

Glucose (Serum/Plasma)

Reference Range

There is no associated reference range for plasma glucose as the concentration should be assessed in conjunction with the fasting and diabetes status. Diabetes mellitus can be diagnosed based on random and fasting glucose. Various cut offs are quoted in the literature however the most commonly used are based on the WHO recommendations (2006) which states with symptoms of diabetes symptoms one requires:


• A random venous plasma glucose concentration ≥ 11.1 mmol/l or
• A fasting plasma glucose concentration ≥ 7.0 mmol/l (whole blood ≥ 6.1 mmol/l) or
• Two hour plasma glucose concentration ≥ 11.1 mmol/l two hours after 75g anhydrous glucose in an oral glucose tolerance test (OGTT).

Gestational diabetes should be diagnosed if the woman has either:


• A fasting plasma glucose level of 5.6mmol/l or above or
• A 2-hour plasma glucose level of 7.8mmol/l or above.

  • Turnaround Time: 1 day
Growth Hormone (GH)

Growth Hormone (GH)

Reference Range

No reference range for Growth Hormone is quoted, as levels can depend upon the time of day, medication and exercise.

  • Turnaround Time: 1 day
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