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Direct Rh D Antibody Screening (Qualitative) in Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of antibodies against the Rh D antigen in your blood, which can affect blood compatibility during transfusions or pregnancy.

Quick summary

["This screening helps prevent complications from Rh incompatibility, especially important for pregnant individuals or those receiving blood transfusions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
95358-8
Short code
RHDV RNA Pnl Spec NAA+probe
Synonyms
RHDV RNA Pnl Spec NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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

Why This Test Matters in Blood Transfusions

If you’ve had a previous pregnancy, blood transfusion, or trauma, your body might develop antibodies against the Rh D antigen. These antibodies can cause severe reactions if you receive Rh-positive blood. This test ensures your blood is compatible with others’ blood during transfusions.

How It Works: Detecting Antibodies

The test uses a special probe to detect Rh D antibodies in your serum or plasma. If antibodies are present, they will bind to the probe, triggering a visible reaction that confirms their presence.

When You Might Need This Test

You may need this test if you’re pregnant (especially if you’re Rh-negative), planning a blood transfusion, or have a history of blood incompatibility events. Doctors also use it to monitor patients with autoimmune conditions or those who’ve received multiple transfusions.

What to Expect Before the Test

No special preparation is needed. A small blood sample will be drawn from your arm. If you’re pregnant, your healthcare provider may schedule this test during routine prenatal visits.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results indicate Rh D antibodies are present, which can lead to hemolytic disease of the fetus or newborn (HDFN) if you’re pregnant with an Rh-positive baby. It also means you’ll need Rh immune globulin (RhIG) during pregnancy to protect your baby. For blood transfusions, a positive screen means you’ll need Rh-negative blood to avoid reactions.

Short name

RhD Antibody Screen

Frequently asked questions

What does a positive or negative result mean for me?
A negative result means no Rh D antibodies were detected in your blood. This is normal and doesn’t require further action unless you have a known risk factor (like pregnancy history). A positive result means antibodies are present, which may require additional testing or special precautions (like RhIG during pregnancy or using Rh-negative blood for transfusions).
Will this test affect my ability to donate blood?
No, this test does not disqualify you from donating blood. However, if you’re Rh-negative and have a positive antibody screen, you’ll need to confirm the antibody type and may need to avoid donating blood to Rh-positive recipients to prevent complications for recipients.
How often should I get this test if I’m pregnant?
If you’re Rh-negative and pregnant, your healthcare provider may recommend this test during early pregnancy (around 28 weeks) and again at delivery to monitor for Rh incompatibility. Some providers also screen at other key prenatal visits if needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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