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FT4

Free Thyroxine

  • Used to judge thyroid function, more sensitive than T4, and the measured value is not affected by TBG

Product Detail

Product Tags

Performance Characteristics

Performance Characteristics

Detection Limit : 0.3 pmol/L ;

Linear Range: 0.3-100.0 pmol/L;

Linear correlation coefficient R ≥ 0.990;

Precision: within batch C.V. is ≤ 15%; between batches C.V. is ≤ 20%;                                  

Accuracy: the relative deviation of the measurement results shall not exceed ± 15% when the accuracy calibrator prepared by FT4 national standard or standardized accuracy calibrator are tested.

Cross-Reactivity:The following substances do not interfere with the T4 test results at the indicated concentrations: TT3 at 500ng/mL,rT3 at 50ng/mL.

Storage And Stability

1. Store Aehealth FT4 Rapid Quantitative test cassette at 2~30℃, shelf life is up to 18 months.

2. Test cassette should be used within 1 hour after opening the pack.

The determination of serum or plasma levels of Thyroxine (T4) is recognized as an important measurement in the assessment of thyroid function. Thyroxine (T4) is one of two major hormones produced by the thyroid gland (the other is called triiodothyronine, or T3), T4 and T3 are regulated by a sensitive feedback system involving the hypothalamus and the pituitary gland. Free T4 is measured together with TSH when thyroid function disorders are suspected. The determination of fT4 is also suitable for monitoring thyrosuppressive therapy.The determination of free T4 has the advantage of being independent of changes in the concentrations and binding properties of the binding proteins;


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