A patient seated in the chair before a blood draw
In person

Rh Type

Whether you are Rh positive or Rh negative, from one blood draw.

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  • 2,000+ lab locations. Find one near you
  • Nothing due at the lab. FSA / HSA accepted
  • Ordered by a licensed clinician

At a glance

Collection
Blood draw
A standard blood draw at the lab.
Preparation
None
Nothing to do ahead of time. Water is fine.
Results
2 to 4 days
Typical turnaround after your visit.
Where
2,000+ lab locations
Nationwide, with nothing due at the lab.

About this test

Your Rh factor shows whether your red blood cells carry a marker called the Rh(D) antigen. This test reports it: Rh positive if they do, Rh negative if not. Rh type generally stays the same for life and is part of routine pregnancy care. It does not include your ABO group.

For adults 18 and older. Test availability varies by lab location.

Who should take this test?

Adults who want to know their Rh factor for their personal health records or for pregnancy planning use this as a one-time result to keep and share with their care team.

Ask about this test

Not sure this is the right test?

AI-generated. For information only, not medical advice. Call 911 for an emergency.

What does this test measure?

Your result tells you whether you are Rh positive or Rh negative, a detail prenatal care teams and other providers may ask about, and one to keep with your health records.

Rh factor (Rh type)
Rh type shows whether your red blood cells carry a marker called the RhD antigen. If they do, you are Rh positive; if not, Rh negative. Rh type matters in pregnancy and for blood transfusions. Hospitals run their own typing before a transfusion, so this result is for your records.
Why it’s measured: Whether you are Rh positive or Rh negative, for your records.

How it works

  1. Step 1

    Order online

    Check out here. A licensed clinician in your state reviews your order and sends it to the lab.

  2. Step 2

    Visit a lab

    Bring a photo ID to any of 2,000+ lab locations. No fasting needed, and nothing is due at the lab.

  3. Step 3

    Get your results

    Results post to your account, usually in 2 to 4 days, each number next to the lab’s reference range.

Find a lab near you

Choose from 2,000+ lab locations nationwide. Your order works at any of them.

What your results tell you

Your result is reported as Rh positive or Rh negative, based on whether the Rh(D) marker is found on your red blood cells.

  • Your number next to the lab’s reference range
  • Explained in plain language
  • A licensed clinician reviews your order and, if appropriate, orders the test.
  • A lab report you can download and share

Prenatal care teams and hospitals run their own typing. A healthcare provider can explain what your Rh type means for you.

Clinical-grade testing, from the comfort of home.

From the lab to your report, every step of our process meets the gold standard in medical testing.

  • CLIA-certified labs

    Every lab we partner with is certified under the Clinical Laboratory Improvement Amendments, meeting both state and federal standards with regular independent inspections.

  • We protect your health data

    We protect your health data with encryption and do not sell it. Some results must be reported to public health authorities by law. See our Privacy Notice.

  • Rigorous quality assurance

    All partner labs run regular internal quality checks, participate in proficiency testing, and comply with federal and state lab regulations.

  • Clinician-reviewed reports

    Results are reviewed by an independent, licensed clinician.

Questions

Common questions.

Anything else, our care team answers by phone, text, or email.

Rh refers to a marker, the D antigen, that may be found on the surface of red blood cells. If your cells carry it, you are Rh positive. If not, you are Rh negative.

Your Rh type is inherited. Being Rh negative is not a health problem on its own, though it matters in pregnancy and for transfusions.

Rh type is part of routine prenatal care. Your Rh type helps a care team decide who may need Rh immune globulin, a medicine given in some pregnancies.

If you are pregnant or planning, share this result with your prenatal care team. They may run their own blood type and antibody tests.

No. Before any transfusion, a hospital or blood bank runs its own typing and compatibility testing on a fresh sample. This result is for your records and general information, and it does not replace that testing.

Not quite. This test reports your Rh factor alone. A full blood type also includes your ABO group: A, B, AB, or O. If you want both, the Blood Type (ABO + Rh) test reports them together from one blood draw.

Lab tests are informational and don’t diagnose conditions on their own. Available to adults 18 and older; test availability varies by lab location. A licensed clinician reviews your order and, if appropriate, orders the test. All testing is performed at CLIA-certified laboratories. Not for emergencies: if you think you may be having a medical emergency, call 911.