PL-7, PL-12, Mi-2, Ku, EJ, OJ, SRP, Jo-1, Quest #3242, EPIC: LAB6501, SOFT: XMA
Specimen Collection Criteria
Collect: Two plain Red-top tubes.
Physician Office/Drawsite Specimen Preparation
Let specimen clot 30-60 minutes then centrifuge to separate serum from cells within four hours of collection. Transfer serum to two plastic transport tubes and refrigerate (2-8°C or 36-46°F).
Preparation for Courier Transport
Transport: 6.0 mL serum, refrigerated (2-8°C or 36-46°F). (Min: 2.0 mL)
- Gross hemolysis and lipemia.
- Gross Icteric specimens.
- Specimens not collected and processed as indicated.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 4 days
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 30 days
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.
Sent to Quest Diagnostics Nichols Institute of Valencia, Valencia, CA.
Tuesday - Thursday.
Results available in 2-6 days.
PL-7 Autoantibodies: None Detected.
PL-12 Autoantibodies: None Detected.
MI-2: Autoantibodies: None Detected.
KU Autoantibodies: None Detected.
EJ Autoantibodies: None Detected.
OJ Autoantibodies: None Detected.
SRP Autoantibodies: None Detected.
Jo-1 Autoantibodies: Less than 1.0.
Radioimmunprecipitation Assay/Enzyme Immunoassay.
A high proportion of patients with idiopathic inflammatory myopathies (IIMs) which include polymyositis, dermatomyositis and myositis associated with other rheumatic diseases, have autoantibodies directed against aminoacyl-transfer RNA (tRNA) synthetases (myositis-specific antibodies), which are a group of cellular enzymes that catalyze the binding of one amino acid to its tRNA. Autoantibodies to eight of these synthetases, histidyl (Jo-1), threonyl RS (PL-7), alanyl RS (PL-12), isoleucyl RS (OJ), glycyl RS (EJ), leucyl RS, lysyl RS and GluPro RS are reported in IIMs. Histidyl-tRNA synthetase (Jo-1) antibodies are the most common (20-30% of IIMs). Anti-PL-7 and PL-12 are found in 3%, anti-EJ occur in 3%, OJ occur in 2%, and anti-GluPro RS, leucyl RS and lysyl RS occur in less than 1%. Aminoacyl-tRNA synthetase autoantibodies are strongly also associated with interstitial lung disease (ILD), arthritis and Raynaud phenomenon.
Quest #3242, EPIC: LAB6501, SOFT: XMA