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HDL Cholesterol: What It Is, Normal Levels, and How to Increase It

HDL cholesterol, known as good cholesterol, helps remove excess fat from the bloodstream and protects heart health. Learn what normal HDL levels are by age and gender, what causes low HDL, how to increase it naturally, and how it compares to LDL cholesterol.

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Thyroglobulin: Uses, How to Test & What High or Low Levels Mean

Thyroglobulin is a protein used to monitor thyroid cancer treatment and detect recurrence after thyroid removal. A blood test can also help identify thyroid conditions like hyperthyroidism or thyroiditis. Learn what high or low thyroglobulin levels may indicate.

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MCH Blood Test (What Low or High MCH Levels Mean)

A Mean Corpuscular Hemoblobin (MCH) is a blood test that measures the average amount of hemoglobin in a blood cell. It is done by adding a reagent to a blood specimen and assessing the color it produces. Low or high levels may be a sign of another health condition. Learn more about what can cause a low MCH or high MCG.

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Segmented Neutrophils: What High & Low Levels Mean

Segmented neutrophils are a type of white blood cell that are essential for protecting the body from harmful microorganisms. They can become high with infections, for example, or low due to stress. Learn more about what segmented neutrophils are, and what high segmented neutrophils or low segmented neutrophils mean.

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Immunoglobulin E (IgE): Normal Levels (& What High Levels Mean)

Immunoglobulin E (IgE) is an antibody that is normally present in low levels of the blood. It plays an important role in regulating allergic reactions and the inflammatory response, as well as fighting parasitic infections. Lenrn more about what normal Immunoglobulin E should be and what high IgE means.

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Urate Crystals: Causes, Diagnosis & Treatment

Urate crystals are a type of sediment that can appear in the urine due to specimen mishandling or due to acidic urine pH. They are usually identified through a urine R&M test. Learn more about what causes urate crystals, how they are diagnosed and treatment approaches .

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What Are Lymphocytes? (Normal, High and Low Levels)

Lymphocytes are a type of white blood cell that help to protect the body from infections. Low lymphocytes can be a sign of illnesses like AIDS or a side-effect of medication. High lymphocytes can occur with infections or allergies. Learn more about the different types and causes of high or low lymphocytes.

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EAG Blood Test: Reference Ranges & Normal Levels

An estimated average glucose (EAG) is the average amount of glucose in the blood over a 2 to 3 month period. It is calculated based on the amount of glycosylated hemoglobin in the blood. Learn more about what EAG is used for, what results mean and what normal levels are.

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Tilt Table Test: Procedure, Results & How to Prepare

The tilt table test is done as part of a workup for dizziness and falls to observe the effect of position changes on heart rate and blood pressure, which can trigger symptoms like weakness or dizziness. The test is done using a special table that tilts forward. Read more about how to prepare for the test.

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RBC in Urine: Causes, Diagnosis & Treatment

RBC in the urine, or hematuria, is a test finding characterized by red blood cells in a urine sample. It can be noted due to red, pink or cloudy. RBC can appear with a UTI, kidney inflammation or due to medications. Learn more about what RBC in the urine means and how it's diagnosed and treated.

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Potassium Levels: Normal Range & What Causes High or Low Levels

Potassium levels are important to keep within normal ranges, as this mineral is very important for proper functioning in the body. Having high or low potassium levels can trigger several symptoms and health conditions, from lethargy to palpitations and fainting. Learn more about what causes high or low potassium levels.

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High Testosterone: Symptoms, Causes & Treatment

High testosterone refers to when testosterone levels are above the normal reference level in the blood. Symptoms can present differently in men and women. Learn more about other symptoms associated with high testosterone, what can cause it, and how it's diagnosed and treated.

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Low Cortisol Levels: Symptoms, Causes & Treatment

Low cortisol levels are characterized by values in the blood that are less than 5 µg/dL in the morning. It can can cause symptoms like fatigue, decreased appetite, weight loss, irritability or depression. Learn more about the symptoms of low cortisol levels and what can cause it.

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What is Cortisol? How It's Tested (& What High or Low Levels Mean)

Cortisol, also known as the stress hormone, is a hormone produced by the adrenal glands. It triggers many stress-related processes in the body and also regulates metabolism and immunity. Learn more about how cortisol levels are tested, and what high cortisol or low cortisol levels mean.

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Blood Test for Anemia: 8 Exams to Help Confirm a Diagnosis

A blood test for anemia can be ordered by your doctor to confirm the presence of anemia as well as evaluate the underlying causes of it. While anemia is usually confirmed by low hemoglobin levels, the doctor can also evaluate characteristics that may be contributing to anemia, like the shape or size of red blood cells.