Thyroid Stimulating Hormone (TSH) with 15-Minute Post-Random Serum Measurement for Thyroid Function Assessment

Why This Test Is Done

Your doctor may order this test if you have symptoms like fatigue, weight changes, or unexplained issues with metabolism. It can also be part of routine thyroid screening or monitoring for conditions like hypothyroidism or hyperthyroidism. The 15-minute post-random measurement helps assess how quickly your body responds to thyroid hormone levels after a short fast.

What to Expect Before the Test

You’ll typically fast for about 15 minutes before the blood draw. Avoid eating or drinking anything except water during this time. Your blood will be taken from a vein, usually in your arm, and sent to the lab for testing.

What the Test Results Mean

TSH levels can vary based on your overall health, age, and medications. High levels may suggest hypothyroidism (underactive thyroid), while low levels could indicate hyperthyroidism (overactive thyroid) or other issues. Your doctor will interpret the results in the context of your symptoms and medical history.

Common Conditions This Test Helps Diagnose

This test is primarily used to diagnose or monitor thyroid disorders, including primary hypothyroidism, secondary hypothyroidism, and sometimes hyperthyroidism. It can also help assess thyroid function in people with symptoms like weight gain, depression, or fatigue.