Compatibility test each unit; incubation technique
CPT4 code
Name of the Procedure:
Compatibility Test Each Unit; Incubation Technique
Common Name: Blood Compatibility Testing
Technical Term: Crossmatching by Incubation
Summary
In simple terms, a compatibility test by incubation checks if a donor’s blood is safe for a blood transfusion to a patient. It mixes small samples of the donor's and recipient’s blood and incubates them to see if any adverse reactions occur.
Purpose
This procedure is essential for ensuring the safe transfusion of blood from a donor to a recipient. It helps prevent dangerous complications like hemolytic transfusion reactions, where the recipient’s immune system attacks the donor blood.
Indications
- The presence of symptoms like severe anemia or blood loss.
- Conditions requiring blood transfusion such as surgery, trauma, or certain medical conditions (e.g., hemophilia, cancer).
- Ensuring compatibility in organ transplantation.
Preparation
- No specific preparation is generally required for the patient.
- A blood sample from both the donor and recipient is collected beforehand.
Procedure Description
- Blood samples are taken from the donor and the recipient.
- The samples are mixed in a controlled environment.
- The mixture is then incubated at body temperature for a specific time.
After incubation, the samples are checked microscopically for signs of agglutination (clumping) or hemolysis (destruction of red blood cells).
Tools and Equipment: Test tubes, incubator, microscope, appropriate blood type reagents.
Anesthesia: Not applicable.
Duration
The procedure typically takes 1-2 hours, depending on the specifics of the test protocols.
Setting
The test is usually performed in a hospital laboratory or a specialized blood bank.
Personnel
- Medical Laboratory Scientists or Technologists.
- Pathologist oversight may be required for interpretation.
Risks and Complications
- There are minimal risks associated with the blood drawing process (e.g., bruising or infection).
- False-positive or false-negative results, although rare, could lead to incorrect transfusion decisions.
Benefits
The successful completion of this test significantly increases the safety of blood transfusions, preventing serious immune reactions.
Recovery
No recovery is needed for the test itself as it is non-invasive. Patients can proceed with their planned transfusion if the compatibility test is successful.
Alternatives
- Electronic Crossmatch: Faster but less commonly used due to the need for extensive computerized records.
- Biochemical Tests: Such as enzyme-linked immunosorbent assays (ELISAs), which may be used as supplementary tests.
Pros of Alternatives:
Some are quicker and can be automated.
Cons of Alternatives:
May not be as reliable in detecting all possible incompatibilities.
Patient Experience
- During Procedure: Minimal discomfort from the blood draw.
- After Procedure: No significant after-effects. The patient can continue with daily activities and prepare for a safe transfusion if needed.
Pain Management: Not typically required, but a local anesthetic cream may be used for the blood draw site if necessary.