Thyroid Disorders Blood Test

What is Thyroid disorders?

Thyroid disorders are conditions affecting the thyroid gland's ability to produce hormones that regulate metabolism, energy levels, and overall body function. They are caused by dysfunction in thyroid hormone production, including hypothyroidism (underactive thyroid with low T3 and T4), hyperthyroidism (overactive thyroid with excess thyroid hormones), or medication effects like lithium inhibiting thyroid hormone release. The Lithium blood test is the most important test for patients on lithium medication as it monitors therapeutic levels while preventing thyroid complications.

RECOMMENDED TEST Lithium
Google reviews 505 reviews
$107 $83
What's included
Fast & easy, results by email & SMS
No extra fees paid at the lab
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
Why Private MD Labs?
90-day money-back guarantee Lab order in minutes Save a trip to the doctor Low prices since 2005 Labs within 2 miles

What causes thyroid disorders?

Thyroid disorders are caused by dysfunction in the thyroid gland's hormone production system, autoimmune conditions, iodine deficiency, medications, or genetic factors. Hypothyroidism often results from Hashimoto's thyroiditis (an autoimmune condition) or iodine deficiency, while hyperthyroidism is commonly caused by Graves' disease or thyroid nodules. Certain medications like lithium can significantly impact thyroid function by inhibiting thyroid hormone release, leading to either underactive or overactive thyroid conditions.

What is the best test for thyroid disorders?

The Lithium blood test is the most important test for patients taking lithium medication because it measures lithium levels that directly affect thyroid function. Lithium can inhibit the release of thyroid hormones T3 and T4, potentially causing both hypothyroidism and hyperthyroidism. For comprehensive thyroid assessment, additional tests measuring TSH (thyroid-stimulating hormone), free T3, and free T4 levels help determine whether your thyroid is underactive or overactive. Regular monitoring with these tests ensures therapeutic medication levels while preventing serious thyroid complications.

When should I get tested for thyroid disorders?

You should get tested if you experience unexplained weight changes, persistent fatigue, sensitivity to cold or heat, hair loss, or mood changes like depression or anxiety. Anyone taking lithium medication needs regular monitoring to check how the drug affects thyroid function. You should also consider testing if you have a family history of thyroid disease, are pregnant or planning pregnancy, or notice symptoms like rapid heartbeat, tremors, difficulty sleeping, or constipation.

What are the symptoms of thyroid disorders?
Thyroid disorder symptoms vary depending on whether your thyroid is underactive or overactive. Hypothyroidism symptoms include fatigue, weight gain, cold sensitivity, dry skin, constipation, depression, and slowed heart rate. Hyperthyroidism symptoms include unexplained weight loss, rapid heartbeat, anxiety, tremors, heat sensitivity, increased sweating, difficulty sleeping, and frequent bowel movements. Both conditions can cause hair loss, changes in menstrual periods, and difficulty concentrating.
Who is at risk for thyroid disorders?
Women are at higher risk than men, especially those over 60 years old or who are pregnant or postpartum. People with a family history of thyroid disease, autoimmune conditions like type 1 diabetes or celiac disease, or those who have received radiation therapy to the neck are at increased risk. Individuals taking medications like lithium or amiodarone face higher risk due to these drugs' direct effects on thyroid function. Iodine deficiency or excess also increases your risk of developing thyroid problems.
What happens if thyroid disorders are left untreated?
Untreated hypothyroidism can lead to severe complications including heart disease, high cholesterol, infertility, nerve damage, and in extreme cases, myxedema coma which is life-threatening. Untreated hyperthyroidism can cause osteoporosis, heart problems including atrial fibrillation and heart failure, vision problems, and thyroid storm (a sudden, life-threatening worsening of symptoms). Both conditions significantly impact quality of life, affecting mental health, energy levels, and overall body function if not properly managed.
Can thyroid disorders be diagnosed with a blood test?
Yes, blood tests are the primary and most reliable method for diagnosing thyroid disorders. TSH (thyroid-stimulating hormone) testing is typically the first test performed, as it indicates whether your thyroid is producing too much or too little hormone. Additional blood tests measure free T3 and free T4 levels to confirm the diagnosis and determine severity. For patients on medications like lithium, monitoring lithium blood levels is essential as this drug directly affects thyroid hormone production and release.
How are thyroid disorders treated?
Hypothyroidism is treated with daily thyroid hormone replacement medication like levothyroxine, which restores normal hormone levels. Hyperthyroidism treatment options include anti-thyroid medications that reduce hormone production, radioactive iodine therapy that destroys overactive thyroid tissue, or surgical removal of part or all of the thyroid gland. For medication-induced thyroid problems, your doctor may adjust the dosage of the causative drug like lithium or add thyroid medication. Treatment requires regular blood testing to monitor hormone levels and adjust medications accordingly.
How can I prevent thyroid disorders?
While you cannot prevent all thyroid disorders, especially those caused by genetics or autoimmune conditions, you can reduce your risk by ensuring adequate iodine intake through iodized salt and iodine-rich foods like seafood and dairy. If you take medications like lithium that affect thyroid function, regular blood test monitoring helps detect problems early. Avoiding excessive iodine supplementation and managing stress through healthy lifestyle habits may also support thyroid health. Regular check-ups are important if you have risk factors like family history.
What natural remedies help with thyroid disorders?
While natural remedies cannot replace medical treatment, certain lifestyle measures support thyroid health alongside prescribed medications. Eating a balanced diet rich in selenium (found in Brazil nuts and fish), zinc, and vitamin D may help thyroid function. Managing stress through yoga, meditation, or regular exercise can benefit overall hormone balance. Avoiding excessive soy consumption and ensuring adequate sleep supports thyroid health. However, always consult your healthcare provider before starting supplements, as some can interfere with thyroid medication absorption or worsen your condition.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
  3. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
  4. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
  5. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
  6. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.
How do I know which test to get?
In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option.

Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.
Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?
Absolutely! We totally understand that errors can happen. No worries, we're here to help you.

Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you.

There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out.

Our lab requires an address to be listed to generate an order.
Do you accept health insurance?
Only HSA & FSA is accepted.

Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts.

This policy applies to all insurance companies, including federal health insurance programs like Medicare.

If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.
Can I cancel my order?
Yes.

We get it – sometimes your needs change.

As long as your samples haven’t been collected yet, we’re happy to help you cancel your order.

If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

You can read more about our cancellation policy here.
How can I find a lab location near me?
During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp).

Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym.

If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Testosterone 375 ng/dL
Demo results
Normal Optimal 400 - 1000 High
375 ng/dL

What this means

Your testosterone levels are slightly below the optimal range. While this is not necessarily cause for concern, it may contribute to occasional fatigue, reduced motivation, or lower muscle mass over time.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.

Us vs. Them

Not overhyped or overpriced. Just comprehensive blood testing made simple and for everyone.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.

1,000,000+ blood tests later, here's what our customers say

Google reviews 505 reviews Next
Lithium
Google reviews 505 reviews
$107 $83
What's included
Fast & easy, results by email & SMS
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
No extra fees paid at the lab

Sample results

Sample image
For you & your coach Health insights Written in human language, backed by science.
Sample image
For you & your doc Classic lab report A familiar and comprehensive lab report.

Ask AI

Your 24/7 Lab Guide

Quick questions:

Which test is right for my symptoms?
What could be causing this?
When should I get tested?
A
Hi, I'm AI. I can help you find the right test, explain results, or prepare for your visit. What can I help with?
Just now
A
AI provides insights, not medical diagnoses.