What are the key clinical features that should raise suspicion for leukaemia in a primary care setting?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 16 August 2025Updated: 16 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

In a primary care setting, key clinical features that should raise suspicion for leukaemia include:

  • Unexplained pallor, which may indicate anaemia .
  • Persistent fatigue that is unexplained and ongoing .
  • Unexplained fever, especially if persistent or recurrent ,.
  • Unexplained persistent or recurrent infections ,.
  • Generalised lymphadenopathy without a clear cause .
  • Unexplained bruising or bleeding, including petechiae ,.
  • Hepatosplenomegaly (enlarged liver and/or spleen) .

In children and young people, additional features raising suspicion include unexplained petechiae or hepatosplenomegaly, which warrant immediate specialist assessment .

When these features are present, NICE guidelines recommend offering a very urgent full blood count within 48 hours to assess for leukaemia ,.

Related Knowledge Topics

Educational content only. Always verify information and use clinical judgement.

Clinical Features That Should Raise Suspicion for Leukaemia: Guideline