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Can dehydration affect blood test?

Possibly. A complete blood count (CBC) test evaluates the overall health of the blood cells circulating in the body. Hematocrit is one component of the CBC test that can be skewed as a result of dehydration.

myonemedicalsource.com - Does Dehydration Affect Blood Tests? - My One Medical Source
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Does Dehydration Affect Blood Tests?

Does Dehydration Affect Blood Tests?

Dehydration is one of several factors that should be considered when inaccurate blood test results are suspected. Water accounts for approximately 60% of an adult human’s body weight, and impacts virtually every system in the body—including the circulatory system. Which blood tests are most commonly affected by dehydration? Learn more below.

Can dehydration skew a cholesterol test?

Yes, it is possible for dehydration to skew the results of a cholesterol test. This is attributed to the fact that dehydration can cause blood volume to decrease, leading to a drop in blood pressure and blood flow. When this occurs, it increases the risk of cholesterol accumulation in the arteries. Additionally, the body may increase the production of cholesterol in response to severe dehydration, in order to protect cell membranes.

Can dehydration affect an electrolyte test?

Yes. Electrolytes are minerals found in body tissues and fluids in the form of dissolved salts and are responsible for maintaining a healthy water balance. A typical electrolyte panel measures sodium, potassium, chloride, and bicarbonate. Any condition that affects the amount of fluid in the body—including dehydration—can cause an electrolyte imbalance.

Can dehydration affect a kidney values test?

Yes. Two of the most common tests for evaluating kidney function and diagnosing kidney disease are the blood urea nitrogen (BUN) test and the creatinine test. Both tests measure the amount of waste product in the blood; higher volumes of BUN and creatinine indicate that the kidneys are not working properly. Dehydration is known to reduce blood flow to the kidneys and elevate creatinine and BUN levels in the blood.

Can dehydration skew a CBC test?

Possibly. A complete blood count (CBC) test evaluates the overall health of the blood cells circulating in the body. Hematocrit is one component of the CBC test that can be skewed as a result of dehydration. This test measures the proportion of blood that is made up of red blood cells (RBCs); as the volume of fluid in the blood drops, the proportion of RBCs rises. Humans get about 20% of the water we need to sustain our bodies from the foods we eat, so fasting can increase the risk of dehydration. If your doctor recommends fasting before a blood test, be sure to drink enough water leading up to the test to help ensure accurate results.

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Can I drink water before hemoglobin test?

You don't need any special preparation for a hemoglobin test. If your health care provider has ordered other tests on your blood sample, you may need to fast (not eat or drink) for several hours before the test.

medlineplus.gov - Hemoglobin Test: MedlinePlus Medical Test

What do the results mean?

There are many reasons your hemoglobin levels may not be in the normal range.

Low hemoglobin levels may be a sign of:

Different types of anemia

Thalassemia

Iron deficiency

Liver disease

Cancer and other diseases

High hemoglobin levels may be a sign of:

Lung disease

Heart disease

Polycythemia vera, a disorder in which your body makes too many red blood cells. It can cause headaches, fatigue, and shortness of breath. If any of your levels are abnormal, it doesn't always mean you have a medical condition that needs treatment. Diet, activity level, medicines, a menstrual period, and other factors can affect the results. You may also have higher than normal hemoglobin levels if you live in a high altitude area. Talk with your provider to learn what your results mean.

Learn more about laboratory tests, reference ranges, and understanding results.

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