What to expect from a blood test for glandular fever

The test involves a small blood sample and may look for an immune response linked with glandular fever. Blood is usually drawn from a vein in your arm; the skin is cleaned first, and the needle is removed after the tubes are filled. You may notice a short sting or temporary bruising. Tell the clinician when your symptoms began, because test choice and interpretation can depend on timing.

Testing may include a rapid antibody test or more specific tests for antibodies associated with the virus that commonly causes glandular fever. Early in an illness, the immune response may not yet be easy to detect, so a negative result does not always settle the question. A clinician may consider your sore throat, swollen glands, fever, fatigue, examination findings, blood count, and liver tests, and may repeat or extend testing if needed. A positive antibody pattern can also reflect past infection, depending on which antibodies are present.

Rest, drink regularly, and follow advice about returning to work, school, or sport. Avoid strenuous activity until a clinician says it is appropriate, particularly if your spleen may be enlarged. Do not share cups, cutlery, or toothbrushes while you are unwell. Ask how and when results will be communicated, and mention any medicines or supplements before starting treatment for throat symptoms.

Get urgent care for severe difficulty breathing or swallowing, inability to keep fluids down, severe abdominal pain, fainting, confusion, or rapidly worsening illness. Sudden pain under the ribs after an injury or exertion also needs urgent assessment. Do not wait for the blood-test report when a serious symptom appears.

Ask which test is being used, whether the timing of symptoms could make it inconclusive, whether repeat testing is needed, when sport is safe, and which symptoms should trigger a same-day review.