High Acetylcholine receptor antibody (AChR): what it means
A Acetylcholine receptor antibody (AChR) result above the normal range is considered high. Here is what a raised Acetylcholine receptor antibody (AChR) can point to, and when it is worth discussing with a doctor.
Reference range: <0.4 nmol/L (negative) is normal; the hallmark antibody of myasthenia gravis — a positive result in someone with fluctuating, fatigable muscle weakness strongly supports the diagnosis
Understand your full resultWhat a high Acetylcholine receptor antibody (AChR) can mean
- Myasthenia gravis — the hallmark finding; a positive AChR antibody with fatigable muscle weakness strongly confirms the diagnosis.
- A higher titre — supports the diagnosis, though the level does not reliably track how severe the disease is day to day.
- Associated thymus abnormality — a positive result often prompts imaging of the thymus (thymoma or hyperplasia).
- Overlap with other autoimmune disease — thyroid disease and others are more common in AChR-positive people.
When to discuss with a doctor
AChR antibody testing is ordered when myasthenia gravis is suspected — that is, when someone has muscle weakness that fatigues with use and recovers with rest, particularly drooping eyelids, double vision, or difficulty with speech, swallowing or chewing that worsens through the day. A positive result strongly supports the diagnosis and leads to specialist neurology care, treatment, and imaging of the thymus. A negative result does not rule it out, so testing continues if the picture fits. Importantly, weakness affecting breathing or swallowing can become an emergency (a myasthenic crisis) and needs urgent care. Mediora.AI shows the AChR antibody alongside related tests so the picture is read together; a positive result and any diagnosis of myasthenia gravis belong with a neurologist.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.