Sign in →

Test Code BLOD0315 Thyroid Peroxidase Antibodies (TPO)




Useful in detecting autoimmune thyroid disease. The highest TPO antibody levels are observed in patients suffering from Hashimoto's thyroiditis. These autoantibodies also frequently occur in the course of Graves’ disease. In addition to autoimmune thyroid disease states, detectable concentrations of TPO antibodies are often detected in the sera of type I insulin-dependent diabetics.

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Serum or Plasma
Container/Tube: Red top, gold top, or light green top (lithium heparin)
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL
Collection Instructions: If there is a delay in transport of >48 hours, freeze specimen in plastic vial, and send specimen frozen.

Specimen Transport Temperature

Ambient <8 hours/Refrigerated >8 hours/Frozen >48 hours

Specimen Stability

Specimen Type Temperature Time
Serum or Plasma Ambient 8 hours
  Refrigerated 48 hours
  Frozen 1 month


Reference Values

28.0-60.0 IU/mL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding