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What is a blood test?

What is a blood test? Here are some definitions.

Noun
  1. A serologic analysis of a sample of blood; a test in which blood is removed from a subject and analyzed to determine the presence or levels of any of a variety of substances which indicate whether the subject has health problems.
  2. An analysis of blood performed on two subjects to determine whether they are biologically related, such as a paternity test.
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This blood test measures the amount of iron bound to transferrin, an iron-carrying protein in your bloodstream.
It transpired blood test results attached on a Post-it to a referral letter had not been seen.
Usually the allergist will start off with something like a skin test or a blood test.
The blood test could identify certain chromosomal changes that guide physicians to prescribe certain anticancer drugs.
A blood test will show a significant reduction in the haemoglobin content of the red blood cells and an increase in the size of the cells.
His blood alcohol level was nearly two and a half times over the limit when the blood test was taken at approximately 6.20 am.

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