Preparation guide
Preparing for a Blood Test
Preparation can affect specimen quality and may include instructions about timing, food, drinks, exercise, medicines, or supplements.
Why is this important?
Understanding the purpose and limits of laboratory information can support a more informed conversation with a qualified healthcare professional.
How laboratory testing relates
The correct preparation depends on the exact test and the reason it was requested; one rule should not be applied to every blood test.
Before testing
Preparation is test-specific. Follow the instructions given for the exact test and contact the laboratory if fasting, timing, medicines, or specimen collection is unclear. Do not stop medicines unless a qualified professional tells you to.
Sources & further reading
- MedlinePlus, U.S. National Library of Medicine: How to Prepare for a Lab Test
External authoritative patient reference · Verified 2026-08-10
Prefer collection at home?
Request Home Collection and our laboratory team will confirm the requirements and appropriate arrangements.
Request Home Collection