Fatigue Tests


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  1. Vitamin B12

    Vitamin B-12 is an essential vitamin. Low blood levels of B12 can cause: Anemia and pernicious anemia, loss of balance , numbness or tingling in the arms and legs, and weakness

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  2. 4-Tube Cortisol-Salivary

    This test for adrenal insufficiency includes 4 measurements of your salivary Cortisol level during one day. Cortisol, also known as the "stress hormone" can be either too high or too low which may be a sign of adrenal distress.

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  3. THYROID Stimulating Hormone-TSH

    The thyroid stimulating hormone (TSH) is produced and secreted by the pituitary gland and stimulates the thyroid to produce T3 and T4. When TSH is elevated, low thyroid function may be indicated. If TSH is low it is indicative of high thyroid function. A study found that TSH was suppressed in all subjects after food, so fasting may be suggested although it is not reqired by Quest. Free T4 and Free T4 values did not change significantly after eating.

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  4. Free Thyroxine T4

    The thyroid gland produces and secretes T4, otherwise known as thyroxine. Proteins bind to T4 and carry it throughout the bloodstream. Once in the tissues, T4 is released from the proteins and is now free to convert into the more active form called T3. For this reason, many doctors believe that measuring free T4 is a more sensitive test for thyroid hormone production.

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  5. THYROID Panel (TSH + Free T3 + Free T4)

    This panel includes comprehensive testing of the thyroid stimulating hormone (TSH) in addition to free thyroxine (T4) and free triiodothyronine (T3). This thyroid panel offers a lower cost than buying each hormone separately.  If you take biotin, please wait at least 8 hours to get blood drawn. A study found that TSH was suppressed in all subjects after food, so fasting may be suggested although it is not reqired by Quest. Free T4 and Free T4 values did not change significantly after eating.

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  6. Ferritin

    Ferritin is a protein that stores iron. Red blood cells need iron to form normally and carry oxygen around your body. Low levels of ferritin lead to iron deficiency anemia, which means you have too few red blood cells. High levels of ferritin can damage your joints, heart, liver, and pancreas.

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  7. ACTH Plasma

    Adrenocorticotropic hormone (ACTH, also known as adrenocorticotropin and corticotropin) is a hormone produced in the anterior pituitary gland that stimulates the adrenal glands to release cortisol, dehydroepiandrosterone (DHEA), and aldosterone. The ACTH plasma test quantifies the blood's level of ACTH. A patient's blood is drawn for the test and then sent to a lab for examination. The test findings enable the diagnosis of ailments such as Addison's disease, Cushing's syndrome, and adrenal tumors

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  8. Cortisol Blood Test

    Cortisol (hydrocortisone) is the most prominent glucocorticosteroid, and it is essential for the maintenance of several body functions. The most important physiological effects of cortisol are that it raises blood sugar levels (enhances gluconeogenesis, or breaks down glucose) and lowers inflammation and the immune system.

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  9. Mononucleosis Test: Epstein-Barr Virus (EBV) Antibodies Panel

    Epstein-Barr (EB) virus is a herpes group virus that is ubiquitous. It leads to infectious mononucleosis and may play a role in the development of Burkitt lymphoma, some nasopharyngeal carcinomas, and a few rare genetic lymphoproliferative disorders. Antibodies to early antigen, IgM and IgG antibodies to viral capsid antigen (VCA), and antibodies to Epstein-Barr nuclear antigen (EBNA) are all part of the EBV test.

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  10. Anemia Panel- 18 Tests

    This 18 test anemia panel includes all tests needed to diagnose the degree and cause of anemia including a CBC panel (red blood cells, hemoglobin, etc), Ferritin, Iron, Total Iron Binding Capacity, Folate, and Vitamin B-12

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  11. Adrenal Insufficiency Panel- Basic

    Discounted Labs’ basic adrenal insufficiency panel includes cortisol, ACTH, and DHEA as a starting point. Depending on lab test results from this panel, physicians may choose to do an ACTH stimulation test, renin, potassium, and sodium. Imaging studies like a CT scan of the adrenal glands may also be considered to check for adrenal growths. In order to check for Addison's Disease, the auto-immune type of primary adrenal insufficiency, labs should be drawn to check 21-hydroxylase 

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  12. Blood Donation Panel
    Special Price $35.00 Regular Price $52.52

    This blood donation panel includes these tests: Hematocrit, iron & total iron binding capacity (TIBC), and ferritin.This panel is designed to determine if: 1- Your blood donation or therapeutic phlebotomy was effective in lowering your high hematocrit without negatively affecting ferritin or iron. 2- It is safe to do another blood donation or therapeutic phlebotomy depending on ferritin or iron levels.

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  13. Male Ultra Elite Panel
    This male ultra elite lab test panel offers the best savings for men to determine their immune health, liver and kidney function, electrolytes, blood sugar, advanced lipid panel, thyroid function, inflammatory markers involved in heart disease, testosterone total and free, urinalysis to determine UTIs and kidney function, ultrasensitive estradiol, DHEA-S, IGF-1, DHT, Prolactin, vitamins D and B12+folate, and iron/ferritin to determine fatigue, anemia or increased risk of iron overload, and PSA.
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  14. Hashimoto's Test Panel

    1. TSH (Thyroid Stimulating Hormone) Test The TSH test is crucial for diagnosing Hashimoto's disease. It gauges the level of TSH that the pituitary gland produces, which in turn stimulates the thyroid to produce T4 and T3 hormones. Elevated TSH levels can indicate hypothyroidism, commonly associated with Hashimoto's disease 

    2. Thyroid Hormone Tests These tests measure the levels of free T3 (free triiodothyronine) and free T4 (free thyroxine) in the blood. A low level of free T4, along with an elevated TSH level, is a key indicator of Hashimoto's disease 

    3. Thyroid Antibody Tests Most individuals with Hashimoto's disease have thyroid peroxidase (TPO) antibodies in their blood. Testing for these and other thyroid-related antibodies is a significant step in diagnosing the condition 

    4. Thyroglobulin Antibody Test This test screens for antibodies against thyroglobulin, a protein in the thyroid gland. High levels are another marker of Hashimoto's disease

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  15. Iron and Total Iron Binding Capacity (TIBC)

    The serum iron test measures the amount of iron in your blood. The total iron-binding capacity (TIBC) test looks at how well the iron moves through your body.

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  16. Comprehensive Fatigue Panel

    The causes of fatigue are multifactorial and could involve imbalances in several hormones. This panel includes most hormones and variables involved in the diagnosis and treatment of fatigue. Ordering this panel provides substantial cost savings when compared to ordering each test separately. The panel is useful for men and women. TESTS INCLUDED IN THIS PANEL: TOTAL AND FREE TESTOSTERONE, THYROID FUNCTION: TSH, Free T3, Free T4, Thyroid Antibodies, HEMOGLOBIN A1c, Complete Blood Count (CBC) Test (Includes white, red cells and platelets), Comprehensive Metabolic Panel (CMP), IRON, TIBC (Total Iron Binding Capacity), FERRITIN, ADRENAL FUNCTION: Cortisol and DHEA-S

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What Are Fatigue Tests and How Can They Help You?


When was the last time you felt fatigued? Most people experienced unexplained tiredness at least once or twice in the last 7 days. It's normal to be tired after a long day at work or after doing excessive physical effort. However, it's not normal to feel fatigued all the time.

If you find yourself lacking energy throughout the day, it's time to do a fatigue test. These blood tests are specially designed to check your hormonal levels and find out why you feel tired most of the time.

In some cases, your thyroid hormones might be the culprit. In other cases, you might have too much stress hormones running through your bloodstream. In any case, keep reading to learn more about fatigue tests and how helpful they can be.

What Are the Substances Checked by Fatigue Tests?

Your energy levels depend on a fragile balance of hormones and other substances. For example, your thyroid gland produces hormones that influence the metabolism of your entire body. It actually tells your system how to use energy and how to metabolize different nutrients.

That's why one of the most common fatigue tests is a thyroid panel. An underworking or overworking thyroid gland can affect your body and cause different symptoms such as weight gain, fatigue, depression, muscle cramps, etc.

Checking the thyroid hormones such as TSH, T3, and T4 will reveal more information on your thyroid health. Based on this, your doctor can prescribe medicine or lifestyle changes to improve your condition and raise your energy levels.

Magnesium Test

Another important element in your body is magnesium. This mineral ensures the proper functioning of muscles and nerves. When you don't have enough magnesium in your body, you might get tired quickly and develop an abnormal heart rhythm.

Apart from the classic magnesium test, there is also another test called magnesium RBC test. This looks specifically at the magnesium content in your red blood cells. The RBC magnesium test is more thorough and gives you a more accurate view of your body's magnesium levels.

Anemia Test

As you probably already know, anemia is characterized by excessive fatigue, poor muscle performance, loss of productivity at work, and difficulties thinking. This is likely caused by too little iron in your bloodstream.

An anemia test looks at different substances in your blood such as your iron levels, hematocrit, red blood cells, hemoglobin, folic acid, and more. Based on the results, your doctor can prescribe iron supplementation as well as other vitamins and minerals to nourish your body. This will eventually help you stop feeling fatigued all the time.

Complete Fatigue Panel

Apart from ordering tests that look at certain substances, you can also order a comprehensive fatigue panel that checks multiple hormones at once. This type of test is particularly useful for those patients who find it hard to trace the reason for their chronic tiredness.

For example, a complete fatigue panel might look at your cortisol levels, DHEA, thyroid hormones, iron levels, and testosterone levels. As you probably already know, low testosterone can make you feel fatigued all the time as well as affecting your gym performance and muscle mass.

Symptoms of Chronic Fatigue Syndrome

Everyone knows how it's like to feel fatigued. You can barely get out of bed, you find it hard to do even simple housework and you want to go to sleep by mid-afternoon. If you have chronic fatigue syndrome, these symptoms might be accompanied by other similar signs that persist over months.

Let's take a look at these additional symptoms that are commonly associated with chronic tiredness.

  • Loss of memory - having difficulties remembering things it's not a big deal in most cases. However, it can be a serious problem if you routinely forget things or feel confused when you try to remember something
  • Poor cognitive performance - many people have difficulties when they try to concentrate. This is not normal, especially if you've had a healthy breakfast and a good night's sleep before. Poor cognitive performance could be linked to chronic fatigue syndrome in some cases
  • Headaches and a sore throat - excessive fatigue is usually accompanied by migraines and headaches that could persist for days
  • Large lymph nodes - you might be able to see enlarged lymph nodes in your neck and armpits. This symptom is usually accompanied by constipation or muscle pain

If you had a long day at work and you feel tired, you have nothing to worry about. However, you should order a fatigue test if your tiredness persists for days, even after a restful weekend. You are urged to order a fatigue test if the symptoms mentioned above accompany your chronic tiredness.

What Are the Complications of Feeling Excessively Fatigued for Days?

Apart from the obvious decrease in the quality of life, experiencing too much tiredness can lead to severe complications. Let's take a look at a few of them:

  • Severe anxiety and depression - especially if your fatigue is accompanied by insomnia, you might develop severe anxiety and depression that could lead to social isolation and even suicidal thoughts
  • Loss of productivity at work - feeling excessively tired will definitely affect your work performance. In extreme cases, people can lose their jobs, especially if they work in construction or other fields that require high physical effort
  • Relationship damage - having little to no energy for anything can also affect your relationships. You might not be able to do things with your kids, spend time with loved ones, or attend social events

Pick Your Fatigue Test Today!

You are not supposed to live with chronic tiredness regardless of your age or medical condition. If you have one or more of the symptoms mentioned above, make sure that you order a fatigue test from below.

These tests will check your health and give you an insight into what's wrong with your hormones. Many patients report improvements after just a few days or weeks of treatment, so why shouldn't you feel full of life and energy again?