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Related Experiment Videos

Normal complement C4 values do not exclude hereditary angioedema.

Y Karim1, H Griffiths, S Deacock

  • 1St Thomas's Hospital, Lambeth Palace Road, London SE1 7EH, UK.

Journal of Clinical Pathology
|January 30, 2004
PubMed
Summary
This summary is machine-generated.

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Hereditary angioedema (HAE) can occur with normal complement C4 levels. Measuring both C4 and C1 inhibitor (C1inh) is crucial for accurate HAE diagnosis, even with normal C4 values.

Area of Science:

  • Immunology
  • Genetics

Background:

  • Hereditary angioedema (HAE) is a rare genetic disorder characterized by recurrent episodes of swelling.
  • Diagnosis typically involves assessing complement C4 levels and C1 inhibitor (C1inh) function.
  • Previous understanding suggested normal C4 levels could exclude HAE.

Observation:

  • A pediatric patient with a family history of HAE presented with swelling and abdominal pain.
  • Despite normal complement C4 concentrations, the patient exhibited symptoms consistent with HAE.
  • Low C1 inhibitor (C1inh) levels were detected, confirming the diagnosis.

Findings:

  • This case demonstrates that hereditary angioedema can manifest with normal complement C4 values.
  • Low C1 inhibitor (C1inh) levels were the key indicator in this patient.

Related Experiment Videos

  • Treatment with tranexamic acid led to reduced frequency and severity of swelling episodes.

    • Implications:

    • The findings challenge the assumption that normal C4 levels rule out HAE.
    • Accurate diagnosis of HAE requires measurement of both C4 and C1inh concentrations.
    • This highlights the importance of comprehensive laboratory testing in HAE diagnosis and management.