Neurology-related laboratory markers and other tests used in selected nervous-system questions. Explore the available markers, reference ranges and limitations of interpretation.
Kidney, electrolyte, autonomic, cardiac, liver, or nervous-system-adjacent markers often need symptom timing and pacing context to become useful.
What this category can do
Neurology-related laboratory markers and other tests used in selected nervous-system questions. Explore the available markers, reference ranges and limitations of interpretation.
Pacing
Pacing makes biomarkers and symptom timing more actionable in everyday management.
Open heart-rate pacingPEM
When symptoms escalate later rather than immediately, a recovery-oriented reading becomes more important.
Open PEM durationWhitepapers
The whitepapers connect physiology, longitudinal interpretation, and Elara’s monitoring logic.
Open whitepapersIf this category is not enough
A category page organizes markers, but many users are actually trying to answer broader questions about fatigue, PEM, pacing, or structured symptom documentation.
Questionnaires
Use validated assessments when a biomarker category alone is too narrow for the underlying question.
PEM
When symptoms worsen after activity, the timing pattern can matter more than a category label.
ME/CFS
Use the illness hub when reduced capacity, fatigue, or multisystem symptoms are part of the larger picture.
Adjacent categories
Adrenaline (epinephrine) is a hormone and neurotransmitter produced by the adrenal glands, central to the body's 'fight‑or‑flight' response.
Reference: 0 - 110
The Aβ42/40 ratio compares the levels of amyloid beta 1-42 and 1-40 in cerebrospinal fluid to help detect amyloid plaques characteristic of Alzheimer's disease.
Reference: 0.1 - 0.3
Neurofilament light chain (NfL) is a protein released when nerve cells are damaged. Measuring NfL in blood helps detect and monitor neurological conditions.
Reference: 2 - 18
Neurofilament light chain (NfL) measured in cerebrospinal fluid (CSF) reflects damage to nerve cells in the brain and spinal cord.
Reference: 200 - 600
Phosphorylated tau 181 (p-Tau181) is a modified form of the tau protein that is a key biomarker for Alzheimer’s disease. Elevated levels in cerebrospinal fluid or blood reflect abnormal tau phosphorylation and neurofibrillary tangle formation in the brain.
Reference: 0 - 24
Serotonin (5-HT) is a neurotransmitter that helps regulate mood, sleep, and appetite. A blood test measures the amount in serum, which mainly reflects platelet serotonin levels.
Reference: 50 - 200
Tau protein is a structural protein in nerve cells that stabilizes microtubules. Measuring total tau in cerebrospinal fluid helps assess nerve cell damage, particularly in neurodegenerative conditions like Alzheimer’s disease.
Reference: 0 - 350
The relevant laboratory tests vary widely by neurological question. Many neurology-related markers are not suitable for general screening and need to be interpreted in a specific clinical context.
