Test Overview
| Test Code: | GFAP |
| Synonyms: | Plasma GFAP |
| Methodology: | Chemiluminescence assay (CLEIA) |
| Validation: | Laboratory Developed Test (LDT) |
| Reference Range: | < 78.2 ng/L (age 45-65) |
Performance
| Frequency: | Once per week |
| Expected Turnaround: | 1 week |
| Sample Report: | Coming Soon |
Our offices are only able to receive samples Mon-Fri, so samples must be shipped Mon-Thur. Samples arriving over the weekend may need to be redrawn.
Specimen
| Specimen Type: | EDTA Plasma |
| Container: | Lavender-top EDTA tube |
| Preferred Volume: | 5 mL |
| Minimum Volume: | 0.5 mL |
| Rejection Criteria: | Grossly hemolytic, lipemic, or icteric. If the sample arrives at room temperature. |
| Collection and Processing: | No patient preparation is required for sample collection. Draw blood in tube(s) with EDTA activator. Centrifuge tubes at 1800 - 2200 x g for 10-15 minutes. Draw off plasma (top layer) into aliquot tubes with pipette, ensuring not to take RBCs (middle/bottom layers). Store aliquot tubes in refrigerator (2° C - 8° C) until shipping. |
| Specimen Handling: | Transport refrigerated or frozen |
| Specimen Stability: | 7 days at room temperature (15⁰ C – 25⁰ C) Up to 4 freeze / thaw cycles |
GFAP is extremely sensitive to temperature and free/thaw cycles. It is critical that time at room temperature be minimized. Refrigerate when not handling, and immediately after sample has been centrifuged and aliquoted.
Additional Information
Order Plasma Glial Fibrillary Acidic Protein (GFAP) Test
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Ordering Process