What should I do before a blood test?
What to check before booking a test and why a result should be interpreted in the context of your care.
General information only. This guide does not diagnose a condition or replace a consultation. This service is not for life-threatening emergencies. Call the appropriate local emergency service or go to the nearest hospital immediately.
Confirm the exact test
Similar test names can have different purposes. Use the clinician’s request where one was issued and confirm the sample type, preparation instructions, collection option, location, fee, and expected turnaround time.
Follow preparation instructions
Some tests require fasting, timed collection, or changes to routine. Do not stop prescribed medicine unless a qualified clinician specifically tells you to do so.
A result is not a diagnosis by itself
Reference ranges and individual results need clinical context. Arrange follow-up with an appropriate clinician, especially for an abnormal result or continuing symptoms.
References
These links were checked during the editorial evidence review.
Have questions about your own care?
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