Less than 1 month:  1.4-5.5 pg/mL
Less than 1 year:     2-6.9 pg/mL
1 - 5 years:        2.4-6.7 pg/mL
5 - 18 years:       2.3-5.5 pg/mL
Adults:           2.57-4.43 pg/mL

To convert results to ng/dL, multiply result x.1
To convert results to pmol/L, multiply result x 1.54

The assay is unaffected by icterus (bilirubin is less than 66 
mg/dL), hemolysis (Hb is less than 1000 mg/dL), lipemia (Intralipid is 
less than 2000 mg/dL) and biotin is less than 1200 ng/mL (criterion: 
recovery within plus or minus 10% of initial value).

18 commonly used pharmaceuticals were tested in vitro. No interference 
with the assay was found.

Therapeutic concentrations of acetylsalicylic acid and furosemide lead 
to elevated FT3 values.

Autoantibodies to thyroid hormones can interfere with the assay.

The risk of interference from potential immunological interactions 
between test components and rare sera has been minimized by the 
inclusion of suitable additives. In rare cases, interference due to 
extremely high titers of antibodies to streptavidin and ruthenium can 
occur. FT3 contains additives which minimize these effects.  For 
diagnostic purposes, the FT3 findings should always be assessed in 
conjunction with the patient's medical history, clinical examination 
and other findings.