How to Understand Your Lab Results: MedlinePlus Medical Test
https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/
WebHome →. Medical Tests →. How to Understand Your Lab Results. What is a laboratory test? A laboratory (lab) test checks a sample of your blood, urine (pee), or other body fluid or tissue to learn about your health. The sample is sent to a lab where health care professionals test it to see if it contains certain substances and, if so, how much.
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