MuSK and LRP4 Antibodies Panel
Use
Detects anti‑MuSK (muscle specific receptor tyrosine kinase) and anti‑LRP4 (low density lipoprotein receptor‑related protein 4) in the sera of patients with Myasthenia Gravis (MG). MuSK is a transmembrane endplate polypeptide involved in a signaling pathway that maintains the normal functional integrity of the neuromuscular junction (NMJ). The LRP4 protein activates MuSK kinase activity and promotes the clustering of the acetylcholine receptor (AChR) and its stabilization at the NMJ. Approximately 8% to 10% of all MG cases and 20% to 50% of the generalized MG cases who lack anti‑AChR have anti‑MuSK. Anti‑LRP4 antibodies are detected in the serum of approximately 9.2% (range 2% to 50%) of MG patients who are negative for both anti‑AChR and anti‑MuSK.
Special Instructions
Not provided.
Limitations
Not provided.
Methodology
Immunoassay (Radioimmunoassay)
Biomarkers
anti‑LRP4 antibodies
Otheranti‑MuSK antibodies
Other
LOINC Codes
- 50398-7 - Narrative diagnostic report-Imp
- 82939-0 - Genetic variant details Bld/T
- 8251-1 - Service Cmnt-Imp
Result Turnaround Time
7-14 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
2 mL
Minimum Volume
0.5 mL
Collection Instructions
Please label each specimen tube with two forms of patient identification. These forms of identification must also appear on the requisition form.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 72 hours |
| Refrigerated | 25 days |
| Frozen | 25 days |
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