Your first stop for a thyroid check is your primary care doctor. They can perform a physical exam of your neck and order the blood tests needed to evaluate how your thyroid is functioning. In most cases, you won’t need a specialist unless your results come back abnormal or your symptoms are severe.
Start With Your Primary Care Doctor
A general practitioner, family doctor, or internist can handle the initial evaluation. During your visit, the doctor will feel your neck to check whether your thyroid gland is enlarged, asymmetric, or has any lumps. They’ll ask you to swallow while pressing gently along your lower neck, since the thyroid moves upward when you swallow and becomes easier to examine. A normal thyroid lobe weighs roughly 7 to 10 grams and often isn’t noticeable at all during this exam.
Your doctor will also order a blood test, typically a TSH (thyroid-stimulating hormone) test. This is the single most common screening test for thyroid problems. For most adults, a normal TSH falls roughly between 1 and 4.5 mU/L, though the upper end of that range shifts higher as you age. Adults over 70 can have a normal TSH up to around 6.0 mU/L. If your TSH comes back abnormal, the lab usually runs a follow-up measurement of free T4 (a thyroid hormone) on the same blood sample to give your doctor a clearer picture.
Symptoms Worth Bringing Up
If you’re not sure whether your symptoms are thyroid-related, it helps to know the basics. An underactive thyroid (hypothyroidism) commonly causes fatigue, weight gain, and a slower-than-normal heart rate. You might also notice dry skin, feeling cold when others don’t, or sluggish thinking. An overactive thyroid (hyperthyroidism) tends to cause the opposite: rapid heartbeat, unexplained weight loss, anxiety, and feeling overheated. Many of these symptoms overlap with other conditions, which is exactly why the blood test matters more than symptoms alone.
When You’d See an Endocrinologist
An endocrinologist is a specialist in hormone-related conditions, including thyroid disorders. Most people don’t need one for a straightforward thyroid check. Your primary care doctor would refer you to an endocrinologist in specific situations: if you’re pregnant and have abnormal thyroid levels, if you have a history of thyroid cancer, if your hypothyroidism appears to stem from a pituitary gland problem, or if hyperthyroidism is causing significant symptoms like rapid heart rate, notable weight loss, or a dangerously elevated T4 level.
Thyroid nodules (lumps found during a neck exam or imaging) are another common reason for referral, particularly when a nodule is 1 centimeter or larger and needs a biopsy. If a nodule is large enough to press on your throat or airway, you might be referred to an ear, nose, and throat surgeon instead.
Where to Get a Thyroid Ultrasound
A thyroid ultrasound isn’t part of routine screening. It’s ordered when your doctor feels something unusual during the neck exam, or when there’s a specific question that bloodwork alone can’t answer. You’ll typically get one at a radiology center, hospital imaging department, or sometimes right in an endocrinologist’s office. Many thyroid specialists perform ultrasounds themselves during your appointment, which speeds up the process considerably.
The most frequent reason for a thyroid ultrasound is to get a better look at a nodule: its size, shape, and whether it has features that warrant a needle biopsy. Ultrasound is also useful when the physical exam is hard to interpret due to factors like obesity, a thick or muscular neck, or prior neck surgery.
Getting Tested Without a Doctor’s Visit
If you don’t have a primary care doctor or want to skip the office visit, several lab chains let you order thyroid blood tests directly. Quest Diagnostics, for example, sells a TSH test online for $49 plus a $6 physician service fee. No insurance or prior doctor visit is required. If your TSH comes back abnormal, they automatically run a free T4 test on the same sample at no extra charge. A more comprehensive panel that includes both TSH and T4 upfront costs around $72. You purchase the test online, then visit a local Quest lab for a standard blood draw.
Labcorp offers a similar direct-to-consumer option. These services are designed for people paying out of pocket and generally don’t submit claims to insurance.
At-Home Thyroid Test Kits
Several companies sell finger-prick thyroid kits you can use at home. While convenient, their reliability is a real concern. These kits are not standardized, and there isn’t enough data from large studies to confirm how well finger-prick results match traditional blood draws. The way you collect the sample introduces variability: how much blood you get, how you handle the collection card, and shipping conditions can all affect accuracy.
False positives and false negatives are possible with any lab test, but the margin of error is wider with home kits. If you use one and get an abnormal result, expect any doctor you see to repeat the test with a standard blood draw sent to a full-size lab. A Columbia University review of home thyroid kits put it plainly: the accuracy and precision of these tests has not been validated in large studies. They can be a reasonable starting point if access is an issue, but they shouldn’t be the final word.
What to Expect Cost-Wise
If you have health insurance, a thyroid blood test ordered by your doctor is typically covered as part of diagnostic labwork, and your out-of-pocket cost depends on your plan’s copay and deductible. Without insurance, a basic TSH test through a direct-to-consumer lab runs roughly $50 to $75. Adding a full thyroid panel with T3 and T4 measurements pushes the cost higher, usually in the $100 to $150 range depending on the lab. An office visit with a primary care doctor to discuss symptoms and order the test adds its own cost, often $100 to $300 without insurance, though urgent care clinics and community health centers tend to charge less.
Thyroid ultrasounds, if needed, are a separate expense. Costs vary widely by location and facility, but uninsured patients can expect to pay anywhere from $100 to $500. Imaging centers that post transparent pricing tend to fall on the lower end compared to hospital-based radiology departments.