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Beckman Coulter 33885 Access Free T4 Calibrator


Analyzer Series: Access Analyzer Series
Brand: Beckman Coulter
Manufacturer SKU: 33885
Package Size: 6 x 2.5 mL
Test Type: Thyroid Assay
Test Name: Free Thyroxine (T4)
Analyzer Type: Hematology Analayzer
SKU: 33885 Category:


Beckman Coulter 33885 Access Free T4 Calibrator (FT4 / Free Thyroxine Test) Specifications:

  • Brand: Access
  • Manufacturer: Beckman Coulter 33885
  • Country of Origin: United States
  • Application: Calibrator
  • Test Name: Free Thyroxine Test (FT4)
  • Test Type: Thyroid Assay
  • Volume: 6 X 2.5 mL
Beckman Coulter 33885 Access Free T4 Calibrator: INTENDED USE

The Access Free T4 Calibrators are intended to calibrate the Access-Free-T4 assay for the quantitative determination of free thyroxine levels in human serum and plasma (heparin) using the Access Immunoassay Systems.


Quantitative assay calibration is the process by which samples with known analyte concentrations (i.e., assay calibrators) are tested like patient samples to measure the response. The mathematical relationship between the measured responses and the known analyte concentrations establishes the calibration curve. This mathematical relationship, or calibration curve, is used to convert RLU (Relative Light Unit) measurements of patient samples to specific quantitative analyte concentrations.

What is a Free Thyroxine Test ? (Free T4 Test)
Beckman Coulter 33885 Access Free T4 Calibrator FT4 Free Thyroxine | JIT4You Clinical Lab Consumables
Beckman Coulter 33885 Access Free T4 Calibrator FT4 Free Thyroxine

A Free thyroxine test is a blood test that helps diagnose thyroid conditions. The thyroid is a small, butterfly-shaped gland at the base of your throat. Your thyroid makes hormones that control the way your body uses energy. These hormones affect your weight, heart, body temperature, muscle strength, and even your mood. In children, thyroid hormones affect growth, too.

Thyroxine, also known as T4, is a type of thyroid hormone. A T4 test (Free thyroxine test) measures the level of T4 in your blood. Too much or too little T4 can be a sign of thyroid disease.

There are two forms of T4 in your blood:

  • Free T4 (Free thyroxine) is the active form of thyroxine hormone that enters your tissues where it’s needed.
  • Bound T4 is thyroxine that attaches or binds to certain proteins which prevent it from entering your tissues.

T4 levels can be measured with either a free T4 test (Free thyroxine) or a total T4 test:

  • A free T4 test (Free thyroxine) directly measures the amount of free T4 in your blood. Medical experts believe this test provides more accurate information than a total T4 test, so it’s used more often.
  • A total T4 test measures free and bound T4 together. A calculation may be done to figure out how much T4 is free. This is a less accurate way to check how well your thyroid is working.

Other names: free thyroxine, free T4, total T4 concentration, T4 index, thyroxine screen, free T4 concentration, thyroxine test by equilibrium dialysis

What is it used for?

A T4 test (Free thyroxine test) is used to check how well your thyroid is working. It’s also used to help diagnose and monitor thyroid disease and conditions that may affect your thyroid, including:

  • Hypothyroidism, or underactive thyroid, which is when your thyroid gland doesn’t make enough thyroid hormone to meet your body’s needs
  • Hyperthyroidism, or overactive thyroid, which is when your thyroid gland makes more thyroid hormone than your body needs
  • Disorders of the pituitary gland, which is a gland at the base of your brain that makes TSH (thyroid stimulating hormone). TSH controls how much T4 your thyroid gland makes. If the results from a TSH test aren’t normal, a T4 test can help diagnose whether the problem is with your thyroid or your pituitary gland.

In certain cases, a T4 test may be done as part of a group of tests called a thyroid panel. A thyroid panel includes a test for TSH as well as other thyroid tests.

Useful LinksT4 Reagent: Beckman Coulter 33880 Access Free T4 Reagent, 100 Determinations