| Test | Specimen Requirements |
| G6PD (Glucose-6-Phosphate Dehydrogenase) | 4mL EDTA (purple) or Filter Paper |
| Galatosemia Screen (for neonates)* Guthrie-Phenylalanine for PKU | Use Guthrie card - available from lab. Instructions for collection are on the card. |
| Gamma Globulins Immunoglobulins A, G & M | 10 mL GEL (white / yellow). |
| Gastric Parietal Cell Antibody* | 10 mL GEL (white / yellow). |
| Gastrin* | 10 mL GEL (white / yellow). Fasting required. |
| Genital Swab Gram Stain and / or wet film for Trichomonas | Swab collected onto gel transport medium |
| Genital Swab Micro & culture includes wet film, gram stain and culture for aerobic and anaerobic organisms including GC. | Swab collected onto gel transport medium. Do not refrigerate. |
| Gentamicin levels Pre dose (trough) Post dose (peak) Single specimen | 10 mL GEL (white / yellow). Pre-Dose. Note time taken. 10 mL GEL (white / yellow). Post-Dose. To be taken: - 30 minute after bolus I.V. injection, 15 minutes after completion of I.V. infusion, 60 minutes after I.M. injection. State frequency and dose - 8, 12 or 24 hourly |
| GGT (Gamma-Glutamyl Transferase) | 10 mL GEL (white / yellow). |
| Glandular Fever (I.M) Screen | 10 mL GEL (white / yellow). |
| Gliadin Antibodies (IgG / IgA)* Coeliac Disease Screen | 10 mL GEL (white / yellow). |
| Glomerular Basement Membrane Antibodies* | 5-10ml GEL (white / yellow) |
| Glucose Fasting specimen Random specimen (Note time of collection) 2 hrs post prandial | 4 mL FLUORIDE OXALATE (grey) 4 mL FLUORIDE OXALATE (grey) 4 mL FLUORIDE OXALATE (grey) |
| Glucose Screen (Gestational Diabetes Screen) | Glucose test 1 hr post 50g loading dose of glucose. Patient is not required to fast. Please indicate if any variation in dose eg: 75g. |
| Glucose Tolerance Test (75g load) 2 specimens - Fasting and 2 hour. | Patient must fast overnight, an appointment is necessary. Please indicate if any variation on standard 2 hour test. |
| Glucose Tolerance Test (Prolonged) 6 specimens - Fasting, 1hr, 2hr, 3hr, 4hr and 5hr | 2 mL FLUORIDE OXALATE (grey) |
| Group and Hold (KIV) Includes - ABO, Rh (D) & Antibodies | 4 mL EDTA (purple) + 10 mL PLAIN (red). Please indicate date / time of operation |
| Growth Hormone | 10 mL GEL (white / yellow), separate serum and freeze immediately. |
| Gonococcal + Chlamydia PCR Combination test for detection of Neisseria gonorrhoea and Chlamydia trachomatis | 1st void urine, urethral or cervical swab or eye swab - DRY SWAB (price is for each or both tests) |