Cardiac Marker Testing in Sharjah

What is cardiac marker testing?

Cardiac marker testing is a blood test that measures substances released into the blood when heart muscle is injured. The main marker is troponin, a protein that sits inside heart muscle cells and leaks out when those cells are starved of oxygen, as happens during a heart attack.

Cardiac marker testing in Sharjah at Dar Al Kamal Hospital uses a blood sample processed urgently by the hospital laboratory, which runs 24 hours a day. Alongside troponin, the doctor may request related markers:

• Troponin, the most specific sign of recent heart muscle injury.
• Creatine kinase (CK) and CK-MB, enzymes released by muscle, with CK-MB coming mainly from the heart.
• BNP or NT-proBNP, hormones the heart releases when its chambers are stretched and under strain, used when heart failure is a question.

A point few patients expect: one troponin result is rarely the whole story. Troponin takes time to climb after heart muscle is injured, so the doctor usually compares two samples taken a few hours apart. The change between the two readings, whether rising, falling or steady, often tells the doctor more than either number alone.

Who needs it

Cardiac marker testing is ordered when a heart attack is possible. Typical reasons include chest pain, pressure or tightness, pain spreading to the arm, jaw, neck or back, breathlessness, cold sweats, nausea, or sudden unexplained exhaustion. Women, older adults and people with diabetes more often have these quieter symptoms, which is one reason doctors use the test readily.

BNP or NT-proBNP is usually requested for a different question: whether breathlessness, tiredness or ankle swelling comes from a heart that is pumping less efficiently. The result helps decide who needs an echocardiogram and how heart failure treatment is going over time.

The wider assessment of chest pain, including the examination and ECG that sit beside these blood tests, is described on the chest pain assessment page.

What happens

Chest pain that could be a heart attack is assessed in the emergency department. An ECG is recorded soon after you arrive, and a nurse takes blood from a vein in your arm, often through the same small cannula later used for fluids or medicines. The sample goes to the laboratory marked urgent, and the result returns to the emergency doctor.

A second sample is usually taken a few hours later. While you wait, you rest in a monitored bed, the team repeats your observations, and the ECG may be repeated too. The doctor then reads the two troponin results together with your symptoms, ECG and examination.

When the results point away from a heart attack, the doctor discusses whether further tests, such as an exercise ECG or an echocardiogram, would help explain the pain. When the results point to heart muscle injury, treatment starts straight away and continues as described on the heart attack treatment page. The laboratory's round-the-clock urgent service is covered on the emergency laboratory access page.

Planned tests are simpler. A BNP check at a clinic follow-up, for example, is a single routine blood sample taken in the laboratory's collection area, with the result sent to the doctor who requested it.

Preparing for it

For a suspected heart attack, the only preparation is reaching the emergency department quickly. Call an ambulance for chest pain rather than driving yourself. Fasting is unnecessary, because food and drink have little effect on troponin.

For a planned BNP or follow-up test, keep taking your usual medicines unless your doctor advises otherwise. Bring:

• your Emirates ID and insurance card;
• a list of your current medicines;
• any previous ECGs, blood results or discharge letters from other hospitals, which let the doctor compare results over time.

It helps to tell the team about recent strenuous exercise, a recent heart procedure, and any kidney condition, because each of these is useful context when the result is read.

Afterwards

When your results and ECG are reassuring, you usually go home the same day with advice on what to watch for and a plan for follow-up, often with cardiology or your family doctor. The follow-up looks for the cause of your symptoms and whether a heart check such as an exercise ECG is worthwhile.

When the results show heart muscle injury, you stay in hospital for treatment and monitoring, and the cardiology team explains each next step. For planned BNP tests, the requesting doctor goes through the result at your next appointment and adjusts your treatment plan where needed.

A small bruise where the needle went in is normal and fades over the following days. Pressing firmly on the site for a few minutes after the sample reduces bruising.

Call an ambulance or go to the emergency department straight away if chest pain returns, lasts more than a few minutes, or comes with breathlessness, sweating, fainting or pain spreading to the arm, jaw or back. Contact the hospital if the needle site becomes red, hot, swollen or increasingly painful.

Cost and insurance

Cardiac marker tests requested in the emergency department are part of emergency care, which UAE insurance plans generally cover. Emergency assessment goes ahead first, and the paperwork with your insurer follows. Planned tests such as BNP at a clinic follow-up are usually covered when a doctor requests them for a clinical reason, and some plans ask for pre-approval. Dar Al Kamal Hospital, Sharjah can help you confirm your cover on 06 599 7777.