Some patients with low TSH combined with normal levels of T3 and T4 eventually develop overt thyroid disease, but clinical assessment and management needs to be tailored to each patient, according to Thyroid Foundation of Canada. Typically, low or suppressed TSH combined with high levels of T4 or T3 indicates hyperthyroidism. Abnormally high TSH in conjunction with low T4 is usually a sign of hypothyroidism.Know More
TSH is released by the pituitary gland to stimulate and regulate thyroid production of the hormones T3 and T4. When thyroid levels decrease, TSH production increases and vice versa. An abnormal TSH reading is believed to indicate thyroid disease, according to Thyroid Foundation of Canada, but there are exceptions.
Research shows that unusual results on TSH tests combined with normal levels of serum hormones T3 and T4 could be related to a nonthyroidal illness, according to Medscape. After the patient recovers, thyroid function tests should return to normal.
Symptoms of true hypothyroidism, or low thyroid production, include dry skin, fatigue, poor appetite, intolerance to cold, constipation and muscle weakness. Symptoms of hyperthyroidism, or overactive thyroid, include weight loss, accelerated or irregular heartbeat, and irritability, according to Mayo Clinic. True hypothyroidism and hyperthyroidism are both treatable with medication, radioactive iodine or surgery.Learn more about Medical Ranges & Levels
A blood test indicating a low granulocyte count means that a patient has a lower number of certain types of white blood cells, particularly neutrophils, than is normal, according to the Scott Hamilton CARES Initiative. A low number of white blood cells increases a person's vulnerability to infections.Full Answer >
The typical range for free T4, or free thyroxine, in a thyroid test is 0.7 to 1.9 ng/dl, according to EndocrineWeb. Typical serum thyroxine, or T4, ranges from 4.6 to 12 ug/dl.Full Answer >
Thyroid stimulating hormone, commonly called "TSH," is produced by the pituitary gland and signals the thyroid to release more thyroid hormones. Low TSH values can be an indicator of hyperthyroidism, goiters, and too much iodine in the body, states the National Institutes of Health.Full Answer >
A T4 test is a blood draw that is analyzed to evaluate the level of the main hormone produced by the thyroid gland, according to the National Institutes of Health. The lab test measures the amount of T4 present within the blood.Full Answer >