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ankylosing spondyitis

Diseases and Conditions When to see a rheumatologist

I have a positive HLA-B27 what does it mean?

June 5, 2018
I have a positive HLA-B27 what does it mean?

During the course of a workup for possible autoimmune arthritis or autoimmune back disease, your rheumatologist may order something called a HLA-B27 test.  So what does a positive HLA-B27 mean?

HLA-B27 antigen

HLA-B27 is a genetic test. The majority of people who have a positive HLA-B27 are perfectly healthy. HOWEVER, having a positive HLA-B7 can put you at increased risk of developing what we call spondyloarthritis-associated diseases. This is a family of autoimmune diseases.

Spondyloarthritis-associated diseases

  • Ankylosing spondylitis (AS), now called axial spondylitis
  • Peripheral spondyloarthritis
  • Reactive arthritis
  • Psoriasis
  • Psoriatic arthritis
  • Uveitis
  • Crohn’s disease
  • Ulcerative colitis

I have a positive HLA-B27, what does it mean?

The answer to this question highly depends on your situation.  As I mentioned earlier, many people who have a positive HLA-B27 are perfectly healthy.  More specifically, the majority of these people do NOT have an autoimmune disease.  Here are a few stats to put things into perspective.

  • About 6 to 9 % of Caucasians and 3 % of African-Americans have a positive HLA-B27.
  • However, having a positive HLA-B27 increases a person’s risk of ankylosing spondylitis by 50 to 100 times.
  • But only 2 % of people who have a positive HLA-B27 go on to develop ankylosing spondylitis.
  • About 50% of people with psoriatic arthritis that involves the spine have a positive HLA-B27.
  • 60% of people diagnosed with reactive arthritis have a positive HLA-B27. These people tend to have more severe symptoms, non-joint symptoms (e.g., uveitis), and it tends to last longer.
  • In the West, 50% of cases of anterior uveitis is associated with a positive HLA-B27 and about half of these people will develop spondyloarthritis.

I was diagnosed with AS, should I have my kids tested?

Technically not unless a family member is experiencing symptoms suggestive of ankylosing spondylitis, psoriatic arthritis, inflammatory bowel disease, or any other spondyloarthritis-associated disease.  Remember, only 2% of people with a positive HLA-B27 go on to develop ankylosing spondylitis, which is the main autoimmune disease associated with this test.

However, people who have a positive HLA-B27 AND have a first-degree relative with ankylosing spondylitis have a 15% to 20% risk of developing the disease at some point during their lifetime.

I guess the answer whether to or whether not to test your kids really is a matter of choice.  My opinion is, if it’s going to happen it’s going to happen. All we really can do is try to make healthy life choices like eating clean, staying active, reduce stress, and making sure we sleep enough.  Remember the Blue Zones Principles?

For some people, knowing they tested positive for HLA-B27 may increase their stress level and for others not knowing whether they test positive or not may be more harmful. Whatever decision you make is highly personal.

In summary

Why having a HLA-B27 increases risk of having ankylosing spondylitis as well as a host of different autoimmune diseases is still uncertain: arthrogenic peptide hypothesis, molecular mimicry, free heavy chain hypothesis, and unfolded protein hypothesis.  These are very complex concepts, which I will hold off on discussing further.

If you want to learn more about HLA-B27 and spondyloarthritis, I invite you to read the following articles: What is autoimmune back pain? Guide to living with psoriatic arthritis: part 1, and What is autoimmune joint pain?

If you think you may be suffering from a spondyloarthritis-associated condition, I encourage you to get in touch with your local rheumatologist.  Here is a link to the American College of Rheumatology physician directory.

Medical Disclaimer

This information is offered to educate the general public. The information posted on this website does not replace professional medical advice, but for general information purposes only. There is no Doctor – Patient relationship established. We strongly advised you to speak with your medical professional if you have questions concerning your symptoms, diagnosis and treatment.

References

Rheumatology Secrets, 3rd edition

Diseases and Conditions Self-Injection Videos

How to inject Humira, Enbrel, Simponi, and Cimzia

August 28, 2017
Video demonstrations on how to how to inject Humira, Enbrel, Simponi, and Cimzia

Humira®, Enbrel®, Simponi®, and Cimzia® are medications commonly prescribed for rheumatoid arthritis, psoriatic arthritis, psoriasis, and ankylosing spondylitis.  All of these come in self-injectable pens or pre-filled syringes.  You will be asked to inject these yourself or by a love one, in the comfort of your home.  Today, we’re going to go over how to inject these self-injectable medications.

Preparing for your injection

  • Keep your medication stored in the refrigerator until use
    • Before injecting medication, take the autoinjector out of the refrigerator.
    • Allow it to warm up to room temperature.
  • Pick a place in your house that is clean and has room for your materials (such as the kitchen table).
  • Wash your hands thoroughly with either:
    • Soap & water
    • Hand sanitizer
  • Chose an area to inject – Thigh or Stomach.
    • Chose an area that is intact and clear.
    • It should not have any of the following:
      • Cuts
      • Scrapes
      • Bruises
      • Psoriasis patches
      • If you have extensive psoriasis, inject between patches
      • Moles
      • Scars
    •  
    • Please rotate area each time you inject (shown in picture below).
Areas to inject subcutaneous medication

By British Columbia Institute of Technology (BCIT). Download this book for free at http://open.bccampus.ca [CC BY 4.0 (http://creativecommons.org/licenses/by/4.0)], via Wikimedia Commons

  • Cleanse chosen area
    • Cleanse chosen area with either of the following:
      • Alcohol swab
      • Alcohol and a cotton ball
    • Use the chosen alcohol material to “swipe” area
      • Can either use a circular motion or wipe in “strips”
      • Allow the area to dry

The injection

  • Take off the white cap, observe the medication in the window to be sure that it is clear (no cloudiness or crystals.)
    • You will see a small air bubble within the window, this is normal and will not cause harm when injecting
  • Press down firmly on the clean area of skin, so that the pen is flush with the skin (90-degree angle).
    • The pen needle will not eject unless pressed firmly to skin

For Cimzia® and other medications that come in prefilled syringes

  • Pinch the skin around the injection site and insert the needle at a 45-degree angle
  • Press in the plunger slowly

You may notice the plunger is hard to press this is due to the size of the medication, be sure to continue to inject slowly to administer all medication

  • Press button to inject the medication.
    • You may feel a slight pinch as the needle enters your skin, and tingling as the medication is administered
    • If you have trouble pressing the button try lifting the pen off your skin, and repressing the pen firmly to the area
  • Hold for 15 seconds.
    • Window will become colored (yellow) but continue to hold dose for at least 15 seconds to ensure that all medication is administered

What to do after the injection

  • Lift the pen up from skin and place the whole pen into the sharps container.
    • If you do not have a sharps container available, contact your pharmacy/doctor’s office about obtaining one
      • In the meantime, you may use an old coffee container with a lid
    • Some hospitals take full Sharps Containers for disposal. Here at the office we do not. Contact your pharmacy for more information about the disposing of your Sharps Container.
  • Discard remaining materials in the trash (cap, alcohol swabs, etc.)

If you have any concerns about your medication (e.g., excessive pain, swelling, redness bruising, bleeding, fever, breathing problems), please contact your rheumatologist.

For more information

Humira® – Abbvie

Enbrel® – Amgen

Simponi® – Janssen

Cimzia® – UCB

Jessica Farrell, PharmD.  Clinical Pharmacist, The Center for Rheumatology/Associate Professor, Albany College of Pharmacy and Health Sciences

With the help of Autumn Koniowka. Doctor of Pharmacy Candidate Class of 2018, Albany College of Pharmacy and Health Sciences, and Megan Phillips. Doctor of Pharmacy Candidate Class of 2018, Albany College of Pharmacy and Health Sciences.

A special thanks to Tammy Garren, PhD. Instructional Designer, Center for Innovative Learning, Albany College of Pharmacy and Health Sciences.

Medical Disclaimer

This information is offered to educate the general public. The information posted on this website does not replace professional medical advice, but for general information purposes only. There is no Doctor – Patient relationship established. We strongly advised you to speak with your medical professional if you have questions concerning your symptoms, diagnosis and treatment.