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Test Code TPO Ab Thyroid Peroxidase Antibody

Patient Preparation

No special patient preparation required

Collection Method

Venous collection

Minimum Volume

  • Adults: 1 mL
  • Pediatric: 0.6 ml

Container

Lt Green / Plasma Separator / Lithium Heparin

Preferred Specimen

Light Green Top (lithium heparin) plasma

Acceptable Specimens

Serum:

  • Gold Top SST
  •  
  • Red Top


Plasma:

 

  • Light Geen Top (lithium heparin)

 

Reference or Target Ranges

<34 IU/mL

Reportable Units

IU/mL

Critical Value

Not defined for this assay

Reasons for Rejection

 


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Hemolysis Threshold 800 mg/dL
Icterus Threshold 66 mg/dL
Lipemia Threshold 1500 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

 


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Ambient 8 days
Refrigerated (4°C to 8°C) 8 days
Frozen(-40°C to 0°C) 24 months

Performance Information

 


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Days and Time Performed 24/7
Expected Turn Around Time Routine: 4 hours
Stat Availability No
Performing Bench UH Chemistry
Methodology/Method Description Roche Cobas – Two step competition assay

Additional Information/Important Notes

The autoantibodies are heterogeneous and this gives rise to non-linear dilution phenomena for individual samples. This assay may not be used in correlation with other manufacturers or vendors due to lack of comparibility. This assay was performed on the Roche Cobas 801 system.

CPT Codes

86376