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Rh(D) Antibody Screening and Titration (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 pregnancy or transfusions.

Quick summary

["Helps prevent complications from Rh incompatibility, especially during pregnancy or blood transfusions."]

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

Key facts at a glance

LOINC
34886-2
Short code
RHDV NAb Titr Ser Nt
Synonyms
RHDV NAb Titr Ser Nt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
neut
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

Rh incompatibility occurs when a person with Rh-negative blood is exposed to Rh-positive blood (e.g., during pregnancy or a transfusion). The body may then produce antibodies against the Rh antigen. This test screens for these antibodies and determines their level (titer) to assess risk.

When You Might Need It

Your healthcare provider may order this test if you’re pregnant, have had a previous pregnancy with Rh incompatibility, or are scheduled for a blood transfusion. It’s also used in blood donation screening and monitoring certain blood disorders.

How the Test Works

A small blood sample is taken and tested using an immunoassay method to detect Rh(D) antibodies. The result may include a qualitative (yes/no) assessment or a quantitative titer (level of antibodies), depending on the clinical need.

What to Expect

You’ll have a quick, painless blood draw. Results are typically ready within 24–48 hours. If antibodies are found, further testing (like a confirmatory Rh antibody panel) may be needed to identify specific antibody types.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Rh Antibody Test

Frequently asked questions

Positive results indicate the presence of Rh antibodies, which can cause hemolytic disease of the fetus or newborn (HDFN) if you’re pregnant or may require special precautions during transfusions. Close monitoring by your healthcare provider is essential to manage risks.
This test helps determine if you’re at risk for Rh-related complications, such as anemia in the fetus or newborn if you’re pregnant with an Rh-negative baby.
How long does it take to get results?
Results are usually available within 24 to 48 hours, but timing may vary based on lab processing. Your provider will discuss the timeline with you before the test.
Can I eat or drink before this test?
No special preparation is needed. You can eat, drink, or take medications as usual. However, inform your provider about any medications or allergies before the test.
  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