Shortly: TSH 3rd generation and 4th generation are also called "Hypersensitive TSH" which have more accuracy in final results beside fast waiting time before receiving the results.
TSH stands for Thyroid simulating hormone, the test result represents the direct measurement the concentration of TSH hormone in your blood, TSH blood test used for identifying the diagnosis of thyroid gland illness. Other thyroid hormones including Thyroxine (T4), and Triiodo thyronine.
Before the emergence of the third and fourth generations of this Lab TSH Test, there was the second generation, which was slower, as it took a day or more to deliver the final result to the patient, and the result was less accurate than the current days.
As using the first and second generations of automatic device technologies for this Test, The Thyroid Stimulating Hormone, the lowest result that the device sensors could feel was one to two units of measurement, while later generations such as the third and fourth generations: can measure and feel the lowest possible percentage, which is less than 0.1.
Also, modern 3rd and 4th generations of TSH lab test has the sensor labels "H letter" for High results, and "L letter" for Low results, as well as flag colors as red for elevated and green for passed results
Therefore, the best in diagnosis the thyroid gland diseases is always to the test based and with the latest technologies (i.e. 3rd or 4th generation TSH), which are always the fastest and most accurate in producing the final result for the patient.
Thus, if the doctor relies on the accurate and rapid tests of modern automatic instruments, he gets the most accurate diagnosis possible, and thus a much better rate of treatment and recovery for his thyroid ill cases.
A patient with TSH lab result 0.9 if done with 1st and 2nd generation TSH based instrument it can be less accurate if carried on 3rd or 4th generation based technology it might be not 0.9 but can be 2.0 or can be as low as 0.1, yes because the previous technologies has lower detection limit and lower sensitivity as well.
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