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|Test Update Information||Effective March 19, 2013, Total T3 testing is being performed on the Abbott Architect i2000 immunoassay analyzer. Note new reference ranges and the change in reporting units from ng/dL with the previous T3 assay (Axsym assay) to the new units in nmol/L.
Conversion formula: (Concentration in ng/dL) x (.01536) = concentration in nmol/L.
|Test group||Thyroid tests|
|Performed by||China Basin Chemistry|
|In House Availability||Test performed weekly on Wednesdays|
|Method||Chemiluminescent Microparticle Immunoassay (Abbott Architect i2000)|
|Container type||Gold top or Light Green top|
|Amount to Collect||1 mL blood|
|Sample type||Serum or plasma|
|Preferred volume||0.5 mL serum or plasma|
|Min. Volume||0.25 mL serum or plasma|
Adult reference ranges adopted from manufacturer reference range studies (95% CI) and verified in-house using blood donor samples (N=124) (excluding autologous donors) on no medications and negative for anti-Tg and TPO antibodies.
Pediatric reference ranges adopted from Clinical Biochemistry 42 (2009) 885-891. Canadian Laboratory Initiative on Pediatric Reference Interval Database (CALIPER).
|Turn around times||1 day|
|Additional information||The total T3 level may be elevated in the < 5% of hyperthyroid patients in whom the FT4 level is normal (T3 toxicosis). Measurement of T3 is of no value in the diagnosis of hypothyroidism. Total T3 can be affected by changes in thyroid binding protein levels. Measurements of Free T3 better reflect biologically active hormone levels than measurements of total T3.|
|Last Updated||2/24/2014 9:32:45 AM|
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