T80.5 Anaphylactic reaction due to serum

Name of the Condition

• Anaphylactic reaction due to serum.

Summary

This condition describes a severe, systemic allergic reaction triggered by exposure to serum, a component of blood or plasma. It is a rapid-onset, life-threatening response involving multiple organ systems, requiring immediate medical intervention.

Causes

Anaphylactic reactions to serum occur when the immune system overreacts to proteins or other components in the serum, releasing histamine and other mediators. This can result from administration of serum-derived products, such as antivenoms, antitoxins, or immunoglobulins.

Risk Factors

• Prior exposure to serum-containing products
• Known allergies to animal proteins (e.g., horse or rabbit serum)
• History of severe allergic reactions (anaphylaxis)
• Underlying atopic conditions (e.g., asthma, eczema)
• Administration of high-risk products (e.g., antivenoms)

Symptoms

• Sudden onset of hives, itching, or flushing
• Swelling of the lips, tongue, or throat
• Difficulty breathing or wheezing
• Rapid heartbeat or hypotension
• Nausea, vomiting, or abdominal cramps
• Dizziness, fainting, or loss of consciousness

Diagnosis

Diagnosis is based on clinical presentation, including rapid symptom onset after serum exposure, and exclusion of other causes. Skin testing or serum-specific IgE testing may confirm the allergy, but treatment often precedes definitive testing.

Treatment Options

Immediate administration of epinephrine is critical, followed by supportive care (e.g., oxygen, IV fluids). Antihistamines and corticosteroids may be used adjunctively. Monitoring for biphasic reactions is essential.

Prognosis and Follow-Up

With prompt treatment, most patients recover fully. However, delayed or inadequate care can lead to respiratory or cardiac arrest. Follow-up includes allergy testing and avoidance of triggering substances.

Complications

• Respiratory failure requiring intubation
• Cardiovascular collapse or shock
• Laryngeal edema causing airway obstruction
• Long-term hypersensitivity or anaphylaxis recurrence

Lifestyle & Prevention

Avoidance of serum-containing products is key. Patients with known allergies should carry an epinephrine auto-injector and wear medical identification. Healthcare providers should review allergy histories before administration.

When to Seek Professional Help

Seek emergency care immediately if symptoms of anaphylaxis occur after serum exposure, including difficulty breathing, swelling, or dizziness. Do not wait for symptoms to worsen.

Tips for Medical Coders

Document the specific serum product involved, timing of reaction, and treatment provided. Ensure clear linkage between the serum administration and the anaphylactic event. Include details of any prior exposure or known allergies to support code assignment.