Where can you find a list of ranges for most lab tests?

Patients can find lists of ranges for most lab tests at websites like MerckManuals and Medscape. The ranges for lab test results indicate the normal or reference levels for certain substances in a sample, such as blood or urine, according to LabTestsOnline.

The reference ranges can vary from one laboratory to the next and are based on the patient's age, gender and other characteristics. This is why it is important for patients to discuss their lab results in depth with their physicians. Doctors know their patients' full medical histories and can view their lab test results in context with their overall health and any diseases or conditions with which they might have been diagnosed.