![]() Using a syringe, the blood sample is drawn from the vein in the arm and transferred to a testing vial.They use 70% isopropyl alcohol pads for that. Meanwhile, they will also disinfect the skin on the arm from where the sample will be collected.The phlebotomist will secure a band on your upper arm to restrict the blood flow to the vein for easy sample collection.First, you will be asked to sit down on a chair, lifting your left or right arm.Here’s what happens during the sample collection: However, we’d recommend giving the samples first thing in the morning for optimal accuracy of the results. So, patients can get their blood samples drawn any time of the day. There aren’t any dietary restrictions with the test, like fasting. So, you need to get it done at a hospital, clinic, or a diagnostic center. Such cases are treated with hormone therapy or assistive treatments as suggested by your doctor.Īs we mentioned, a TSH test is a standard blood test. If your test results for any of these hormones aren’t in the “normal” range, it indicates a potent thyroid disorder in the body. The normal range for that is 0.8 to 1.8 ng/dL. Īnother marker in the thyroid function test is the free T4 levels. The normal range of T3 is 100 to 200 ng/dL, and the normal range of T4 is 5.0 to 12.0 μg/dL. In such cases, your doctor will prescribe further testing of the T3 T4, and TSH normal range before starting the treatment. However, if the test results come back less than 0.4 mIU/L or over 4.0 mIU/L, it indicates potent thyroid disorders in the patient. So, if your test results come back in that range, it indicates that you have a healthy and perfectly functional thyroid gland. This is your first step toward diagnosing a possible thyroid disorder. The TSH test is a routine blood test that measures the TSH levels in the bloodstream. On the contrary, low levels of TSH indicate that the thyroid gland is producing excess T3 and T4 hormones. The TSH hormone then stimulates the thyroid gland to secrete optimal levels of T3 and T4 hormones from it.Ībnormal levels of TSH (especially high levels) indicate that the thyroid gland is not producing sufficient thyroid hormones. TSH, or thyroid-stimulating hormone, is secreted from the pituitary gland in the body. ![]() Hypothyroidism (underactive thyroid gland)īut, what role does TSH play in this equation?.Hyperthyroidism (overactive thyroid gland).Generally, there are two types of thyroid disorders: People struggling with thyroid disorders often have unregulated levels of T3 and T4 hormones in their bodies, both of which lead to a barrage of unpleasant symptoms. The thyroid gland is responsible for producing two crucial hormones – triiodothyronine (T3) and thyroxine (T4).
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