D-dimer
Also written: D-dimer
What it measures
A fragment produced when a blood clot is broken down.
Why it is ordered
Mainly used to RULE OUT clot in low-risk people — its greatest value is a negative result. It rises in many other situations: after surgery, infection, pregnancy, older age.
How to prepare
Nothing required. Mention recent surgery, long-haul flights, or pregnancy.
Units
ng/mL FEU · µg/mL FEU (đọc theo đơn vị ghi trên chính tờ kết quả) — convert here
What to ask
- Is this being used to rule out or to confirm in my case
- If it is raised, what happens next
This page does not include reference ranges and does not say whether your number is high or low. Reference ranges differ between laboratories and between people — read yours on your own report, with your clinician.