Published: 20 Aug 2023

Even though false negatives and positives are uncommon, your provider may need to do multiple tests to make sure your diagnosis is correct.

What factors can affect my results?
There are many factors that can affect the accuracy of your test results. These include:
Certain foods and drinks
Medicines
Stress
Vigorous exercise
Variations in lab procedures
Having an illness
If you have any questions about your lab tests or what your results mean, talk to your health care provider.A false positive result means your test shows you have a disease or condition, but you don't actually have it.
A false negative result means your test shows you don't have a disease or condition, but you actually do.
These incorrect results don't happen often, but they are more likely to happen with certain of types tests, or if testing was not done right.

Is usually given with dL (decilitres) as the denominator in the United States, and usually with L (litres) in, for example, Sweden. Mass concentration (g/dL or g/L) is the most common measurement unit in the United States. 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. liver function tests like AST, ALT, LD and v-GT in Sweden.International units (IU) are based on measured biological activity or effect, or for some substances, a specified equivalent mass. Enzyme activity (kat) is commonly used for e.g. 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. 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.