ARUP's Laboratory Test Directory

Striated Muscle Antibody, IgG with Reflex to Titer : 0050746

Mnemonic: STM R

Methodology: Semi-Quantitative Indirect Fluorescent Antibody
Performed: Mon-Fri
Reported: 1-5 days
Specimen Required: Collect: Serum separator tube.

Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.15 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Plasma. Contaminated, hemolyzed, or severely lipemic specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; 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. Additional charges apply.
CPT Code(s): 86255; if reflexed, add 86256
Cross References: Anti-Striated Muscle Antibody (Striated Muscle Antibody, IgG with Reflex to Titer)