ARUP's Laboratory Test Directory

0050746: Striated Muscle Antibody, IgG with Reflex to Titer

Test Mnemonic: STM R
Methodology: Indirect Fluorescent Antibody

Performed: Mon-Fri

Reported: 1-5 days

Specimen Required:  
Collect: One 4 mL SST.

Transport: 1 mL serum at 2-8°C. (Min: 0.5 mL)  Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.15 mL serum at 2-8°C.

Remarks: Separate serum from cells ASAP.

Unacceptable Conditions: Plasma.  Severely lipemic, contaminated, or hemolyzed specimens.

Stability: After separation from cells: Ambient: 2 days; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval:
Screen:  < 1:40 No antibody detected.
Titer:    < 1:40 No antibody detected.

Note:
Titers greater than or equal to 1:80 are suggestive of myasthenia; however, striated muscle antibody can be found in rheumatic fever, myocardial infarction, and a variety of post-cardiotomy states.  All positives will be titered to endpoint. If Striated Muscle Ab is >1:40, then a titer will be added.

CPT Code(s):
86255 Striated muscle; if reflexed, add 86256 Striated muscle titer

 

 

 
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