Immunoglobulin Phenotype for Transfusion Testing — Child
A specialized blood test that characterizes immunoglobulin markers to support transfusion evaluation and investigate immune reactions.
["This test helps characterize a child’s immunoglobulin markers when transfusion planning or reaction evaluation is needed."]
Key facts at a glance
- LOINC
- 66389-8
- Short code
- Child transfusion immune globulin PhenX
- Synonyms
- Child transfusion immune globulin PhenX
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- phenx
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
An immunoglobulin phenotype is a specialized laboratory analysis that characterizes the forms or inherited markers of immunoglobulins, the proteins involved in immune defense. In a child, this testing may be used as part of a transfusion-medicine evaluation.
Why might I need this test?
The transfusion team may order this test when evaluating a suspected transfusion reaction, identifying immunoglobulin differences that could affect compatibility, or assessing unusual immune responses. It may also provide information in the evaluation of certain immune or immunodeficiency concerns.
How is the test performed?
A laboratory specialist analyzes a blood sample to determine the child’s immunoglobulin marker pattern. The exact laboratory method is not specified by the test name, so the blood bank or laboratory should explain which procedure will be used.
How do I prepare for the test?
No fasting is usually required for this type of blood test. Follow the transfusion team’s instructions and tell them about any prior transfusions, transfusion reactions, immune disorders, or immunoglobulin medicines the child has received.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An unusual immunoglobulin pattern may reflect normal inherited variation or an immune response, including a response related to prior transfusion exposure. In a transfusion evaluation, the pattern may help the blood bank investigate compatibility or explain a reaction. Results should be interpreted with the child’s medical history and other laboratory and blood-bank findings.
Short name
Transfusion immunoglobulin phenotype
Frequently asked questions
Is this the same as a routine blood type?
Does the child need to fast before the test?
What if the child has received a blood transfusion before?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy