Not Medical Advice: 1.88 is within the normal value. According to MedlinePlus, normal values range from 0.4 - 4.0 milli-international units per liter (mIU/L). Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.
A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland. It tells the thyroid gland to make and release thyroid hormones into the blood.
A higher-than-normal TSH level is most often due to an underactive thyroid gland (hypothyroidism). There are many causes of this problem.
A lower-than-normal level may be due to an overactive thyroid gland, which can be caused by:
Toxic nodular goiter or multinodular goiter
Too much iodine in the body (due to receiving iodine contrast used during imaging tests, such as CT scan)
Use of certain medicines may also cause a lower-than-normal TSH level. These include glucocorticoids/steroids, dopamine, certain chemotherapy drugs, and opioid painkillers such as morphine.
Check out 5 Tips for a Healthy Thyroid, shared by Gaia.