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HomeLab Services GuideTests
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Overview
ข้อมูลทั่วไป Specimen
ข้อมูลสิ่งส่งตรวจ Performance
ข้อมูลการทดสอบ Clinical & Interpretation
ข้อมูลทางคลินิก
 
Test Code (รหัสการทดสอบ):
FT3
Order Name (ชื่อการทดสอบ):
Free-T3 (Triiodothyronine, Free)
 
Specimen / Container (สิ่งส่งตรวจ/ภาชนะ):
Blood/ Plain Blood (Red Top) 6 mL, 1 tube
 
Turnaround Time (ระยะเวลารอผล):
Specimen collected to reported within 2 hours
 
Useful For (ประโยชน์การทดสอบ):
Determination of free triiodothyronine (Free T3) in human serum.

Used as an aid in the assessment of thyroid status.
 
Methodology (วิธีการทดสอบ):
Chemiluminescent Microparticle Immuno Assay (CMIA)
 
AliasesName (ชื่อเรียกอื่นๆ) :
Free Triiodothyronine
FT3
Triiodothyronine, Free
 
 
 
Test Code (รหัสการทดสอบ):
FT3
Order Name (ชื่อการทดสอบ):
Free-T3 (Triiodothyronine, Free)
 
Collection Specimen Or Container (สิ่งส่งตรวจ/ภาชนะ):
Blood/ Plain Blood (Red Top) 6 mL, 1 tube
 
Specimen Testing Type (สิ่งส่งตรวจที่ใช้ในการทดสอบ):
Serum, minimum volume 1 mL
 
Sub Mission Container (ภาชนะส่งตรวจ):
Plastic vial
 
Specimen Stabillity (ความคงตัวของสิ่งส่งตรวจ):
Specimen Type Temperature Time
Serum (keep in original tube) Refrigerated, 2oC to 8oC 8 hours
Serum Refrigerated, 2oC to 8oC 6 days
Frozen, -10oC or colder > 6 days
 
 
 
Test Code (รหัสการทดสอบ):
FT3
Order Name (ชื่อการทดสอบ):
Free-T3 (Triiodothyronine, Free)
 
Method detail (วิธีการทดสอบ):

 
 
Schedule (ตารางการทดสอบ):
Tested daily (24 hours)
 
 
Turnaround Time (ระยะเวลารอผล):
Specimen collected to reported within 2 hours
 
Performing Location (หน่วยงานที่ทำการทดสอบ):
Immunology, Laboratory Department Tel. 13227
 
Specimen Retention Time (ระยะเวลาเก็บสิ่งส่งตรวจ):
5 days
 
 
 
Test Code (รหัสการทดสอบ):
FT3
Order Name (ชื่อการทดสอบ):
Free-T3 (Triiodothyronine, Free)
 
 
Clinical Information (ข้อมูลทางคลินิก):
Triiodothyronine (T3) is a thyroid hormone with a molecular weight of 651 daltons and a half-life in serum of 1.5 days.  T3 circulates in the blood as an equilibrium mixture of free and protein bound hormone. T3 is
bound to thyroxine binding globulin (TBG), prealbumin, and albumin. The actual distribution of T3 among these binding proteins is controversial as estimates range from 38-80% for TBG, 9-27% for prealbumin, and 11-35%
for albumin.  The binding of these proteins is such that only 0.2-0.4% of the total T3 is present in solution as unbound or free T3. This free fraction represents the physiologically active thyroid hormone. 

Free T3 is typically elevated to a greater degree than free thyroxine (T4) in Graves’ disease. Occasionally, free T3 alone is elevated (T3 thyrotoxicosis) in about 5% of the hyperthyroid population. In contrast, levels of free T4 are elevated to a greater degree than free T3 in toxic multinodular goiter and excessive T4 therapy.  Serum free T3 is useful in distinguishing these forms of hyperthyroidism. Free T3 may also be important in monitoring patients on anti-thyroid therapy where treatment is focused on reducing the T3 production and the T4 conversion to T3. Serum free T3 may also be useful in assessing the severity of the thyrotoxic state.
 
Reference Value (ค่าอ้างอิง):
Free-T3.JPG
 
Clinical Reference (เอกสารอ้างอิง):
  1. Manufacturer’s Reagent package insert Architect Free T3, Abbott Ireland Diagnostic Division, Lisnamuck, Longford Co., Ireland
  2. Reference range: Bumrungrad hospital Verification of Reference range Interval (Method validation/Verification for Free T3)