Plasma Antibody Screen — Deprecated Legacy Test
A blood-bank laboratory test that looks for antibodies in plasma. The deprecated slug does not clearly identify the antibody target or assay method.
["This test checks plasma for antibodies that may affect blood matching or transfusion compatibility."]
Key facts at a glance
- LOINC
- 77312-7
- Short code
- Deprecated Ab+Pl+Lx.b>A.ab+V CT.Angio W
- Synonyms
- Deprecated Ab+Pl+Lx.b>A.ab+V CT.Angio W
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct-angio
- 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?
This is a general test for detecting antibodies in plasma, a liquid portion of blood. The compressed test name is marked as deprecated, and its antibody target and method cannot be identified with confidence, so the lab's full test name should be used for confirmation.
Why might I need this test?
Plasma antibody testing is commonly used to check whether donated or prescribed blood may be safe for transfusion. It may also be used to investigate antibodies that develop after pregnancy, previous transfusions, or certain immune conditions.
How is the test performed?
A blood sample is collected, and the liquid plasma is separated. The plasma is mixed with laboratory reagents, and any visible reaction or other instrument signal is interpreted to determine whether relevant antibodies are present.
How do I prepare for the test?
A blood draw usually requires no special preparation unless the laboratory gives specific instructions. Tell the care team about recent blood transfusions, pregnancy, or prior antibody findings, and do not stop medicines unless instructed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Antibodies detected by this test may be important when matching blood for transfusion or pregnancy care. Unexpected antibodies can occur after transfusion, during pregnancy, or because of an immune or autoimmune condition. A blood-bank or laboratory specialist should interpret the finding in the context of the exact test used.
Short name
Plasma antibody screen
Frequently asked questions
Does a positive result mean I have an autoimmune disease?
Why is this test labeled deprecated?
Will I need another blood test?
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