Acetylcholine Receptor Binding Antibody


Sunquest Code:ACRBAB  
Epic Code:LAB836Epic Name:Acetylcholine Receptor Binding
Synonyms:AChR Binding Antibody; Anticholinesterase Antibody
Methodology:Radioimmunoassay
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 2-3 days.
Compliance:

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the U.S. Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.



Collection Instructions

Specimen:Blood
Optimal Volume:1 mL
Minimum\Peds Volume:0.8 mL
Container:Red or gold (gel) (Red (no gel))
Causes for Rejection:Severely lipemic; contaminated or hemolyzed specimens. Plasma.


Processing and Shipping

Specimen Processing:Separate serum from cells ASAP. Centrifuge and aliquot 0.5 mL, 0.3 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:80009 (ACHRBIN)


Interpretive

Reference Range:

Negative: 0.0-0.4 nmol/L; Positive: ³ 0.5 nmol/L

 

Use:Approximately 85-90% of patients with myasthenia gravis (MG) express antibodies to the acetylcholine receptor (AChR), which can be divided into binding, blocking and modulating antibody. Binding antibody can activate complement and lead to loss of AChR. Blocking antibody may impair AChR binding to the receptor leading to poor muscle contraction. Modulating antibody causes receptor endocytosis resulting in loss of AChR expression, which correlates most closely with clinical severity of disease. Approximately 10-15% of individuals with confirmed myasthenia gravis have no measurable binding, blocking or modulating antibody.


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