BORDETELLA PERTUSSIS (IGG ANTIBODIES- QUANTITATIVE)

The Bordetella pertussis IgG Antibodies (Quantitative) Test is a specialized blood test that quantitatively measures Immunoglobulin G (IgG) antibodies against Bordetella pertussis, the bacterium responsible for whooping cough (pertussis). This test helps assess previous exposure to the bacteria, immune response following vaccination, or recent infection when interpreted along with clinical findings.

Whooping cough is a highly contagious bacterial respiratory infection that affects people of all ages but is particularly dangerous for infants, young children, pregnant women, older adults, and individuals with weakened immune systems. It spreads through respiratory droplets released during coughing or sneezing.

The disease usually begins with mild cold-like symptoms, followed by severe coughing fits that may produce the characteristic "whooping" sound during inhalation. Persistent coughing may last for several weeks and can lead to complications such as pneumonia, seizures, weight loss, rib fractures, and breathing difficulties.

The Quantitative IgG Antibody Test measures the concentration of Bordetella pertussis-specific IgG antibodies in the blood. It is useful in evaluating suspected pertussis, assessing immune status after vaccination, and supporting diagnosis in patients who present later in the course of illness when bacterial culture or PCR may be less effective.

This test is often performed alongside PCR testing, bacterial culture, clinical examination, and vaccination history for a comprehensive evaluation.

Benefits of the Test

• Quantitatively measures Bordetella pertussis IgG antibodies
• Supports diagnosis of whooping cough
• Helps assess previous exposure or immune response
• Useful when symptoms have been present for several weeks
• Assists in evaluating vaccination-related immunity
• Requires only a peripheral blood sample
• Supports timely diagnosis and clinical management

Why Doctors Recommend This Test

Doctors may recommend this test for individuals with:

• Persistent cough lasting more than two weeks
• Severe coughing fits
• Suspected whooping cough
• Known exposure to Bordetella pertussis
• Evaluation of vaccine-induced immunity
• Chronic unexplained respiratory symptoms
• Contact tracing during pertussis outbreaks
• Assessment when PCR or culture results are unavailable or inconclusive

Preparation Before Test

Sample Required

• Peripheral venous blood sample (Serum)

Preparation Guidelines

• No fasting is required.
• Continue prescribed medications unless advised otherwise by your physician.
• Inform your healthcare provider about recent pertussis vaccination, respiratory infections, or antibiotic treatment.
• Follow laboratory instructions before sample collection.

Reporting Time

Results are generally available within 3–7 working days, depending on laboratory methodology.

Who Should Take This Test?

This test is recommended for:

• Individuals with suspected whooping cough
• Children and adults with prolonged cough
• Healthcare workers exposed to pertussis
• Family members of infected individuals
• Pregnant women when clinically indicated
• Individuals requiring evaluation of pertussis immunity
• Patients referred by pediatricians, pulmonologists, infectious disease specialists, or physicians

Clinical Significance

Elevated Bordetella pertussis IgG antibody levels may indicate:

• Previous Bordetella pertussis infection
• Recent pertussis infection (when interpreted with symptoms and timing)
• Immune response following pertussis vaccination
• Exposure to Bordetella pertussis

Common symptoms of whooping cough include:

• Persistent severe cough
• Sudden coughing fits
• Characteristic "whooping" sound after coughing
• Vomiting after coughing
• Runny nose
• Mild fever
• Fatigue
• Difficulty breathing during coughing episodes

Because IgG antibodies may develop after both natural infection and vaccination, test results should always be interpreted together with the patient's clinical history, vaccination status, symptom duration, and, when appropriate, PCR testing or bacterial culture.