Search all medical codes

Particle agglutination; titer, each antibody

CPT4 code

Name of the Procedure:

Particle Agglutination; Titer, Each Antibody


Particle agglutination titer testing is a laboratory procedure used to measure the concentration of specific antibodies in a patient's blood. The test involves mixing a sample of the patient's blood with particles coated with antigens. If antibodies are present, they will bind to the antigens and cause the particles to clump, which can then be measured to determine antibody levels.


Particle agglutination is used to diagnose and monitor various infections, autoimmune diseases, and other medical conditions involving the immune system. The primary goal is to detect the presence and quantity of specific antibodies to help understand a patient’s immune response and guide treatment decisions.


  • Symptoms of ongoing infections (e.g., fever, fatigue, swelling)
  • Signs of autoimmune disorders (e.g., rash, joint pain)
  • Monitoring the effectiveness of treatments for infections or immune-related diseases
  • Evaluating immune system function in immunocompromised patients


  • No special preparations such as fasting are typically required.
  • Inform the healthcare provider about any medications being taken, as some might interfere with the test results.
  • Blood sample collection, which requires basic identification and consent.

Procedure Description

  1. A blood sample is collected from the patient, usually from a vein in the arm.
  2. The blood sample is mixed with particles (often latex beads) coated with antigens corresponding to the antibodies being tested.
  3. Observation is made for agglutination (clumping) of particles, indicating the presence of antibodies.
  4. The degree of agglutination is measured to determine the concentration (titer) of the antibodies.
    • The procedure uses standard lab equipment such as microscopes and spectrophotometers.
    • No anesthesia or sedation is required.


The blood draw takes a few minutes, while the laboratory analysis typically takes a few hours to a day to complete.


Performed in a clinical laboratory within a hospital or outpatient clinic.


  • Phlebotomist or nurse for blood collection
  • Medical laboratory technologist for conducting the test
  • Physician or specialist for interpreting results

Risks and Complications

  • Slight pain or bruising at the blood draw site
  • Rarely, infection or excessive bleeding at the puncture site


  • Accurate identification and quantification of specific antibodies
  • Helps diagnose various health conditions, guiding appropriate treatment
  • Non-invasive and relatively quick procedure


  • No specific recovery required
  • Patients can usually resume normal activities immediately after the blood draw
  • Follow-up depends on test results and overall health status


  • ELISA (Enzyme-Linked Immunosorbent Assay)
    • Pros: Highly specific, quantifiable
    • Cons: More time-consuming and expensive
  • Rapid diagnostic tests
    • Pros: Quick results
    • Cons: May be less accurate or specific

Patient Experience

  • Minimal discomfort during the blood draw, typically a quick and straightforward experience
  • Patients might experience a mild pinch or sting during needle insertion
  • Post-procedure instructions are minimal, usually involving keeping the puncture site clean and applying pressure if necessary.

Similar Codes