91365      Tissue Transglutaminase Antibody, IgG
Specimen:
  Collect: One 7.5 mL SST  
  Submit: 1 mL (Min:0.5 mL) Serum. Submit Refrigerated. Submit in a Standard Transport Tube.  
  Special Handling: Separate from cells ASAP 
  Rejection Criteria: Grossly Lipemic Samples
Hemolyzed specimens 
  Stability: Ambient: 2 Day(s); Refrigerated: 2 Week(s); Frozen: 12 Month(s); Incubated: Unacceptable 
Methodology: Enzyme-Linked ImmunoSorbent Assay (ELISA) 
Performed: Mon-Sat 
Reported: 2-5 Day(s) 
CPT Codes:
83516 - Immunoassay
Interpretive Data:
Reference Range:
Less than 20 EU - None Detected
20-30 EU - Weakly Positive
Greater than 30 EU - Positive
A negative Tissue Transglutaminase IgG (tTG) antibody result in an untreated patient does not rule out gluten-sensitive enteropathy. This patient may be IgA positive or have no antibody to tTG.