Extended coagulation panel

Does your doctor request a broader clotting check before a procedure, or do you have bruising and bleeding and want your platelets checked too? The extended coagulation panel contains D-dimer and a complete blood count alongside PT, APTT and fibrinogen. One blood draw shows how your blood clots, whether you have enough platelets and whether there are signs of increased clot breakdown.

Who the panel is for

• people before major surgery or a procedure, when a doctor requests broader clotting investigations;
• people who bruise easily, develop small red spots on the skin or frequently bleed from the nose and gums;
• women with heavy periods, in whom anaemia is checked at the same time;
• people with liver disease or a long-term inflammatory disease, when a doctor monitors clotting and blood count;
• people treated for thrombosis or taking anticoagulants, when a doctor requests follow-up.

The panel is not a replacement for emergency assessment. If you have swelling and pain in one leg, sudden breathlessness, chest pain or cough up blood, go to an emergency department immediately or call 194 or 112.

What the panel detects

• Prothrombin time (PT) and INR: how quickly blood clots through one part of the clotting system; also monitored during warfarin treatment.
• APTT: another part of the clotting system; prolonged, for example, in haemophilia and with heparin.
• Fibrinogen: a protein from which a clot forms; elevation most often accompanies inflammation.
• D-dimer: fragments formed when a clot breaks down. A normal value helps rule out thrombosis when it is unlikely.
• Complete blood count: red and white blood cells, haemoglobin and platelets, blood platelets important for stopping bleeding.

Together, they give a fuller picture than the basic panel alone: they show whether clotting factors work, whether there are enough platelets and whether anaemia is present.

The procedure and preparation

All tests are performed from one blood draw from a vein. A morning fasting visit is recommended because of PT.

State if you take anticoagulants and when you took the last dose, because they change PT and APTT and lower D-dimer. Do not stop them yourself. Also mention recent surgery, injury, infection or pregnancy, because these raise D-dimer and fibrinogen.

What your result means

• Normal result: the main clotting components and platelet count are normal. When thrombosis is unlikely, normal D-dimer argues against a clot.
• Elevated D-dimer: more clots are breaking down in the body than usual, but the result does not show where or why. Elevation is common in pregnancy, older age, after surgery and with infection and inflammation. Your doctor decides whether further investigation is needed, for example venous ultrasound (Colour Doppler ultrasound of leg veins is performed only in Split).
• Prolonged PT or APTT, low fibrinogen: possible causes include medicines, vitamin K deficiency, liver disease or clotting factor deficiency; a doctor usually checks the abnormality first by repeating the test.
• Low platelets or anaemia: may explain bruising, bleeding or fatigue, and a doctor investigates the cause.

Your doctor interprets the result alongside your symptoms, medicines and other results.

How to arrange testing

You can have blood taken without an appointment or referral at one of our branches across Croatia (listed under Contact). Prices for all tests and panels are available in the price list. If you only need a basic check before a procedure, the following is sufficient: Coagulation panel (PT, APTT and fibrinogen).

Frequently asked questions

How does it differ from the basic coagulation panel?

The basic panel contains PT, APTT and fibrinogen. The extended panel also includes D-dimer and a complete blood count with platelets, making it more suitable for bruising, bleeding and anaemia.

What if D-dimer is elevated but I have no symptoms?

This is common and does not necessarily mean you have a clot. Speak to your doctor, who will decide according to your condition whether additional testing or only monitoring is needed.

Do I need to fast?

A morning fasting visit is recommended, after a night without food. You may drink water.

Can the panel rule out thrombosis?

A laboratory result alone cannot. Normal D-dimer argues against thrombosis only when a doctor assesses through examination that it is unlikely. With typical signs, do not wait for a result; seek emergency care immediately.