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RHD Antibody Screening (Serum)

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

This test detects the presence of antibodies against the RhD antigen, a key blood group protein that determines whether your blood is Rh-positive or Rh-negative. It’s used primarily to prevent complications during pregnancy or blood transfusions.

Quick summary

["Checks for RhD antibodies that could affect pregnancy or blood safety."]

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

Key facts at a glance

LOINC
23577-0
Short code
RHDV Ab Ser Ql IA
Synonyms
RHDV Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 Pregnancy

If you’re pregnant or planning pregnancy, this screening helps identify whether you have RhD antibodies, which can sometimes cause problems for your baby if you’re Rh-negative and your partner is Rh-positive. Early detection allows for additional monitoring or interventions to ensure a safe outcome.

How the Test Works

A small blood sample is taken and tested for RhD antibodies using an immunoassay method. If antibodies are found, they’re confirmed with a follow-up test to ensure accuracy.

What to Expect During Testing

The process is quick and painless. You’ll have a small needle inserted, and the blood is collected into a vial. Results are typically available within 24–48 hours, depending on lab processing times.

Possible Results and Next Steps

A negative result means no RhD antibodies are detected. A positive result indicates the presence of antibodies, which may require additional testing (like a RhD antibody titer) or closer monitoring during pregnancy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

RHD Antibody Screen

Frequently asked questions

How soon can I expect results after my blood draw?
Results are usually ready within 24–48 hours, but this can vary by lab. Your healthcare provider will contact you once they’re available.
What if my test is positive for RhD antibodies?
A positive result means you’ll need closer prenatal monitoring, which may include regular ultrasounds, Rh immune globulin injections, or additional blood tests. Your doctor will tailor your care plan based on your specific situation.
Can I have this test if I’m not pregnant?
Yes, this test is sometimes performed for blood donation screening, pre-surgical evaluations, or in cases where Rh incompatibility is suspected in non-pregnant individuals.
  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