9 Facts about blood testing that you should understand

Articles Jun 24, 2020 15:11

The analysis of blood for both negative and false positive errors and errors should meet the abnormal index is not necessarily a disease, so the doctor may not tell you

Blood test, or hematological test, is a test that is done on a blood sample to measure the content of certain substances in the blood or to count different types of blood cells. Blood tests may be done to look for signs of disease or pathogens, to test for antibodies or signs of tumors or to evaluate the effectiveness of treatments.

9 Facts about blood testing that you should understand

Interesting facts about blood tests

Normal limits for men and women are not the same

Normal values ​​for tests may vary between sexes, even at the same age. For example, the number of red blood cells in the bloodstream is usually in the range of 5 to 6 million cells / microliter for men but lower for women, especially for postmenopausal women. For menopausal group, this index only reaches 4-5 million cells.

There is no pain when taking blood

If you are afraid of blood or getting injected, this is good news. A new invention in the US makes devices to replace the role of needles and you can easily take your own blood at home. Just place the device on the area to draw blood, it will automatically draw blood in the right amount.

9 Facts about blood testing that you should understand


With the blood glucose test, blood fat only gives accurate results when the patient is fasting for 8 - 12 hours, you absolutely must not eat anything to ensure the results get accurate. Because after eating, nutrients will convert into glucose causing blood sugar to rise. If you do a test, the result will not be accurate.

The amount of blood collected will vary depending on the test

If you're wondering why doctors take different blood samples, there's nothing to worry about, each test will require a different amount of blood and be marked with different colors when you actually do it. does a blood test. Blood samples after collection will be preserved with many different conditions: the same anticoagulant, preservative, ... so it is necessary to take many blood samples.

9 Facts about blood testing that you should understand

Test results vary among age groups

We all know about the differences in blood test results between adults and children. For example, the amount of hemoglobin in children is 11-13gm / dl, adults are 13.5-17.5 gm / dl and adult women are 12-15.5 gm / dl.

False positives and false negatives may also appear

Blood test results can also be flawed and misleading then the doctor will ask you to check again if you have other external manifestations. For example: If you are infected with the hepatitis C virus, your blood test results may not show any abnormalities because you were infected a few months ago, but you still feel the symptoms.

9 Facts about blood testing that you should understand

Doctors often hide when the disease gets worse

To facilitate treatment or avoid shock, your doctor may "hide" your deteriorating test results. Moreover, it is also because the blood analysis is both negative and false positive, and there are many errors, so having an abnormal index is not necessarily a disease, but many doctors do not tell you. The solution to this problem is to compare your test results with another normal person.

Blood test results may vary between different laboratories

Depending on the amount of blood taken, the time it takes for you to draw blood and the type of food you eat before the test can completely affect the blood test results.

9 Facts about blood testing that you should understand

The results are not completely caused by the disease

Not all blood test results show that you have a medical condition. For example, you ate something or drank alcohol the night before the test could affect your glucose levels the next day, so follow your doctor's instructions exactly.

Watch next: What your Blood Test Reveals

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