This private blood test measures D-dimer, a protein fragment produced when a blood clot dissolves in the body. The catalogue test price is £94.38 plus a £50 phlebotomy fee, with results normally available in 1 day.
You can walk in or book online seven days a week at 117a Harley Street. If you have acute chest pain, sudden breathlessness or a swollen painful calf, seek urgent medical assessment immediately rather than waiting for an outpatient test.
Written by Mr Stephen Lingam. Reviewed by Dr Mohammad Bakhtiar (GMC 4694470) on 18/10/2026.
Routine turnaround at our Harley Street laboratory is 1 working day.
Seek emergency care immediately if you have sudden shortness of breath, chest pain, coughing up blood, or a hot, swollen, painful leg that could indicate a deep vein thrombosis or pulmonary embolism.
No. D-dimer is sensitive but not specific: infection, inflammation, trauma, recent surgery, pregnancy and advancing age can all raise D-dimer without a clot.
No fasting is needed. You can eat and drink normally before your appointment.