Serum Free Glutamate Concentration
This test measures the level of free glutamate, a key neurotransmitter involved in brain function, in your blood serum.
["Glutamate levels may help assess metabolic or neurological conditions."]
Key facts at a glance
- LOINC
- 47629-1
- Short code
- Glutamate SFr Spec
- Synonyms
- Glutamate SFr Spec
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test if you have symptoms like seizures, neurological disorders, or suspected metabolic issues. It could also be part of a broader evaluation for conditions affecting brain chemistry or energy metabolism.
What Does the Result Mean?
Results are interpreted based on clinical context rather than absolute numeric ranges. Abnormal levels might suggest imbalances in brain chemistry or metabolic disorders, but your doctor will discuss findings with you.
Common Conditions Monitored
Glutamate levels may be monitored in patients with epilepsy, mitochondrial disorders, or other neurological conditions where neurotransmitter imbalances are suspected.
Sample Collection Details
A blood sample is drawn from a vein, typically in your arm. The serum portion (liquid part after clotting) is used for testing. This is a standard procedure and may cause a brief pinch or discomfort.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Free Glutamate
Frequently asked questions
Glutamate is essential for brain function but can become harmful in excess. Elevated levels may indicate conditions like epilepsy, metabolic disorders, or certain neurological diseases. Low levels could suggest deficiencies or disorders affecting neurotransmitter synthesis.
High glutamate levels may raise concerns about overstimulation of brain pathways, potentially linked to seizures or metabolic disturbances. Low levels might suggest deficiencies in neurotransmitter production or processing, though interpretation depends on your overall health and symptoms.
Your doctor will determine how often to repeat this test based on your symptoms, medical history, and treatment plan. Some conditions require ongoing monitoring, while others may only need a one-time check.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy