Mass concentration (g/dL or g/L) is the most common measurement unit in the United States.
International units (IU) are based on measured biological activity or effect, or for some substances, a specified equivalent mass. Is usually given with dL (decilitres) as the denominator in the United States, and usually with L (litres) in, for example, Sweden. Reference ranges for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Enzyme activity (kat) is commonly used for e.g. liver function tests like AST, ALT, LD and v-GT in Sweden.Reference ranges for blood tests are studied within the field of clinical chemistry, the area of pathology that is generally concerned with analysis of bodily fluids. Molar concentration (mol/L) is used to a higher degree in most of the rest of the world, including the United Kingdom and other parts of Europe and Australia and New Zealand.

A laboratory (lab) test is a procedure in which a health care provider takes a sample of your blood, urine, other bodily fluid, or body tissue to get information about your health. Lab tests play an important role in your health care. Other tests provide more general information about your organs and body systems. Some lab tests are used to help diagnose, screen, or monitor a specific disease or condition. Your health care provider may order one or more lab tests to:
Diagnose or rule out a specific disease or condition
An HPV test is an example of this type of test. Your provider will likely include a physical exam, health history, and other tests and procedures to help guide diagnosis and treatment decisions.
Lab tests are used in many different ways. If you've already been diagnosed with a disease, lab tests can show if your condition is getting better or worse. It can give your health care provider important information about your overall health and risk for certain diseases.But they don't provide a complete picture of your health. It is also sometimes used to diagnose the disease.
Check your overall health. Lab tests are often included in a routine checkup. It can show you whether or not you have an HPV infection
Screen for a disease. A screening test can show if you are at a higher risk for getting a specific disease. Your provider may order tests of various organs and systems to see if there have been changes in your health over time. Testing can help find health problems before symptoms appear.
A complete blood count is a type of routine test that measures different substances in your blood. It can also find out if you have a disease, even if you have no symptoms.
A Pap test is a type of screening test for cervical cancer
Monitor a disease and/or treatment. It can also show if your treatment is working.
A blood glucose test is a type of test that is used to monitor diabetes and diabetes treatment.