Total Thyroxine (T4)

Kit Name	Total Thyroxine (T4) Rapid Test
Method	Fluorescence Dry Quantitative Immunoassay
Assay Measuring Range	0.5 μg/dL ~ 30.0 μg/dL
Incubation Time	15 min
Sample Type	Human serum, Plasma (EDTA), Whole Blood (EDTA)
Reference Range	5.0 μg/dL ~ 11.39 μg/dL
Storage and Stability	18 months 2℃~30℃

Order Information

Catalog No.	Product	Test/Kit
FCTT4E01	Total Thyroxine (T4) Rapid Test	25

Corresponding platform

Learn about the details of the platform corresponding to this reagent

Jet-iStar Platform – FIA for Every Healthcare Setting

Introduction

Total Thyroxine (TT4) is the predominant circulating hormone synthesized and secreted by the thyroid gland. It serves as a vital prohormone and a key regulator of the body's basal metabolic rate, influencing cardiovascular health, muscular function, and overall growth and development. The "total" measurement includes both the metabolically active free T4 and the larger reservoir of T4 bound to carrier proteins in the blood.

Clinical Applications

Comprehensive Thyroid Screening

Therapeutic Efficacy Monitoring

Evaluation of Protein-Binding Abnormalities

Synergistic Thyroid Profiling

Comprehensive Thyroid Screening

Serves as a primary and indispensable biomarker to evaluate thyroid function and screen for thyroid disease, effectively identifying classical hyperthyroidism and primary or secondary hypothyroidism.

Therapeutic Efficacy Monitoring

Provides objective, quantitative data crucial for monitoring patients undergoing thyroid hormone replacement therapy (e.g., levothyroxine) or taking anti-thyroid medications, ensuring dosages are optimized for sustained endocrine balance.

Evaluation of Protein-Binding Abnormalities

Since TT4 measures protein-bound thyroxine, it is particularly useful when assessed alongside Free T4 (FT4) to identify clinical conditions that alter thyroxine-binding globulin (TBG) levels, such as pregnancy, hepatic disorders, or specific pharmacological treatments.

Synergistic Thyroid Profiling

To deliver maximum diagnostic confidence, TT4 is optimally utilized alongside other essential markers, including TSH, FT4, TT3, and FT3. This holistic panel approach allows clinicians to fully evaluate the hypothalamic-pituitary-thyroid (HPT) axis.