How effective is blood test for glandular fever?

Tests may look for antibodies linked with the infection and may also show changes in white blood cells or liver-related markers. Antibody levels can take time to develop, so a test taken early in the illness may not settle the diagnosis. A positive result needs to be matched with symptoms such as a sore throat, swollen glands, fever and marked tiredness. Other infections can cause a similar illness, which is why the test is not interpreted alone.

Rest, drink regularly and use only symptom medicines that are suitable for you. Ask the clinician when to return to exercise, contact sport or heavy lifting, because glandular fever can enlarge the spleen. Avoid sharing drinks or cutlery while unwell. If the result is unclear and symptoms continue, ask whether another blood test or an alternative diagnosis should be considered.

Seek urgent help for severe difficulty breathing or swallowing, inability to drink, intense left upper abdominal pain, fainting, confusion or rapidly worsening weakness. These symptoms can signal a complication or severe dehydration. Arrange medical review for persistent fever, worsening jaundice or symptoms that are not improving.

Ask which test was used, whether the illness may be too early for a clear antibody result, and whether liver tests or repeat testing are needed. Ask how long to avoid contact sport, which medicines are appropriate, and which symptoms should send you to urgent care.