Reverse T3 (rT3) Test

The reverse T3 blood test is used to help determine if an individual has sick euthyroid syndrome. Reverse T3 (rT3) is a byproduct of thyroid hormone metabolism. Reverse T3 is biologically inactive and does not stimulate thyroid hormone receptors. If you suspect of thyroid dysfunction usually the thyroid tests that are completed are TSH, T3, and T4. The reverse T3 is added to gather more information regarding your thyroid health.

Prices vary by location, please select your location to view local pricing

Find this test near you

Test Details

FAQs

Am I required to fast?

No, fasting is not required. There are no dietary or medicinal restrictions to take this test.

WHAT IS THE SAMPLE REQUIRED?

A simple venous blood draw.

Is a doctor's order required?

No. You do not need to provide a doctor’s order to get lab testing done at Any Lab Test Now.

Do I need to make an appointment?

No. You can walk in for same day testing. We make it easy for you by offering work-friendly hours.

IF I HAVE QUESTIONS ABOUT MY TESTS RESULTS WHO SHOULD I CONTACT?

We recommend you share your results with your primary care physician or with your specialist (Endocrinologist).

Customers Also Bought

Complete Blood Count

Learn more

A CBC is a great test to take to give you a “snapshot” of your health. This test gives important information about the kind and the number of cells in your blood. Physicians use this information to evaluate symptoms, help diagnose conditions and treat certain illnesses (like infections).

Comprehensive Metabolic Panel

Learn more

The Comprehensive Metabolic Panel (CMP) is a blood test that provides valuable information about your kidney function, liver function, electrolytes, blood sugar, and more. It can be used to detect and monitor a variety of health conditions. This panel is typically requested by your healthcare provider as part of a routine check‐up or annual physical.

The Comprehensive Metabolic Panel includes 15 essential tests:

Electrolytes:

Sodium (Na)
Potassium (K)
Chloride (Cl)
Carbon Dioxide (CO2)
Calcium (Ca)

Kidney Function:

Blood Urea Nitrogen (BUN)
Creatinine (Cr)
Glomerular Filtration Rate (GFR)

Liver Function:

Alkaline Phosphatase (ALP)
Bilirubin, Total
Aspartate Transaminase (AST)
Alanine Transaminase (ALT)

Additional Tests:

Albumin
Total Protein
Glucose

Cholesterol (Lipid) Panel

Learn more

The Lipids Panel can determine if you have abnormal cholesterol or triglyceride levels. These are important because they can also help you and your doctor determine if you’re at risk for heart disease or other coronary (heart) illnesses.

Cholesterol is fat that is produced by the liver. It can also be obtained from foods like cheeseburgers, pizza, etc. There are two kinds of cholesterol – the good and the bad.

High Density Lipoproteins (HDL) = Good cholesterol.
Low Density Lipoproteins (LDL) = Bad cholesterol.

Hemoglobin A1C (Diabetes Monitoring)

Learn more

The Hemoglobin A1c Test is a valuable measure of the overall blood glucose levels over a period of time (2‐3 months). This test can be used to help detect pre‐diabetes and diagnose diabetes. If you’re diabetic, this test can help determine if your disease is under control.

Prostate Specific Antigen (PSA)

Learn more

Prostate-Specific Antigen (PSA) is a protein made in the prostate gland. The PSA, Total test measures the amount of PSA in the blood.

PSA is either bound or unbound (free) in the blood. Bound PSA is attached to other proteins; free PSA is not attached to other proteins.

Elevated PSA levels may be found in conditions such as benign prostatic hyperplasia, prostatitis, prostate cancer, and others. PSA may also be elevated due to certain medications or urologic procedures.

The PSA test is not diagnostic of cancer, and PSA test results should be followed up by a healthcare provider.

Testosterone, Free & Total

Learn more

The Testosterone, Free (Direct), Serum with Total Test will determine the level of testosterone (free and total) in your blood.

Testosterone is a hormone (commonly produced in males, but is also in females in small amounts) that affects sexual features and development. Testosterone levels explode in men after puberty and continue to rise until about age 40.

Overall, this test will give you a better understanding of how much testosterone is in your blood.

Thyroid Stimulating Hormone

Learn more

The thyroid gland is responsible for regulating how your body uses energy. The thyroid also produces hormones critical to proper cell and system functioning.

The Thyroid Stimulating Hormone (TSH) test checks your body’s production of TSH and helps screen for thyroid disease, hyperthyroidism and hypothyroidism.

There are two types of thyroid disorders including:

Hypothyroidism (underactive thyroid) – symptoms may include fatigue, weight gain, a short attention span, and numbness or cold intolerance.
Hyperthyroidism (overactive thyroid) – symptoms may include weight loss, persistent vomiting, increased blood pressure, hair loss or a persistently fast heart rate.

Blood Type and Rh Factor

Learn more

The Blood Typing and RH Factor Test determines your blood type [either A, B, AB, and O] and Rh factor [negative or positive]. Did you know there are several benefits in knowing both?

Blood type is determined by the types of antigens (or markers) on your blood cells. Antigens are proteins on the surface of your blood cells that can cause a response from the immune system – which is good in fighting disease.

The Rh factor is a type of protein on the surface of red blood cells. Red blood cells that contain protein are called Rh‐positive and the red blood cells that don’t are Rh‐negative. If you have Rh‐negative blood, it can be given to anyone because it can’t be identified as foreign in other people’s bodies (because it doesn’t have an antigen.)

Vitamin D

Learn more

Vitamin D is a fat soluble vitamin that interacts with and regulates more than 200 genes in the body. Your body absorbs Vitamin D from exposure to sunlight or ultraviolet light on exposed skin, and from plants, fortified foods and supplements.

Vitamin B12 Test (Blood)

Learn more

Vitamin B-12, also called cobalamin, is a water soluble vitamin that plays a key role in the formation of blood (red blood cells and white blood cells), normal functioning of the brain and nervous system. Vitamin B-12 is one of the eight B vitamins, and it is involved in the metabolism of every cell in the human body.

TIBC (Total Iron Binding Capacity)

Learn more

The Iron and Total Iron Binding Capacity (TIBC) Test measures the amount of iron in your blood. Having too much or too little iron in your blood can cause medical problems. However, this test is mainly used to determine certain types of anemia.

Constant Upset Stomach?

Reverse T3 (rT3) Test

Test Details

FAQs