Reference ranges are not universal
A numerical result is usually shown beside a reference range. Laboratories can use different methods, units and ranges; the one printed on your own report is the relevant starting point. Age, sex, pregnancy and other factors may also matter.
A value outside the range does not automatically prove disease, and a value inside it does not always rule a problem out. A clinician considers your symptoms, examination, history and other investigations together.
Positive, negative or inconclusive
Some tests report whether a target was found rather than a number. A positive result may require confirmation or further assessment; a negative result may not end the investigation if symptoms or timing still matter.
An inconclusive result means the test did not give a clear answer. Ask whether another sample, another method or a repeat at a different time is appropriate. No test is perfect.
Compare like with like
When following a marker over time, compare the units, laboratory method and reference range as well as the value. A change may reflect real biology, testing conditions or a different method.
Keep the complete report—not only a screenshot of a highlighted number—so the professional reviewing it can see dates, units and comments.
Know who owns the follow-up
Before a test, ask who will review the result and contact you if it is urgent or unclear. If a result is flagged or symptoms persist, speak to the clinician who requested it or another qualified professional.
This guide cannot interpret your personal report. Do not delay urgent care while searching a directory or waiting for an enquiry reply.
Questions to ask
- Which reference range applies to my report?
- Do the symptoms and other tests change the interpretation?
- Is a repeat or confirmation needed?
- Who should I contact, and when?