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Help Understanding Test Results

Brown42186
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Brown42186 Rookie
Brown42186
Posted

I'm having a hard time understanding my blood test results. I've dealt with stomach issues for a few years and was tested for celiac but had not been eating much gluten if any at all around the date of my test. Could you help me interpret my results? Should I eat gluten consistently then have them redone? Thanks!

Deamidated Gliadin ABS, IGA - 4 units

Deamidated Gliadin ABS, IGG - 3 units

Endomysial Antibody IGA - Negative

Immunoglobulin A, QN, Serum - 211 mg

TTG IGA - <2 U/mL

TTG IGG - 9 U/mL

The bottom result for TTG IGG is the only one flagged as high, but does that mean I have celiac? Or is that just something else?

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Scott Adams Grand Master
Scott Adams
Posted

Welcome to the forum, could you please include the reference ranges for each test, as they vary from lab to lab...thank you!

trents Grand Master
trents
Posted

The elevated TTG-IGG could be caused by celiac disease but it can be elevated for other reasons as well. The centerpiece of celiac blood antibody testing is the TTG-IGA and apparently that was not elevated. When you had the blood draw done for the testing, had you already been cutting back on gluten?

Brown42186 Rookie
Brown42186
Posted
  • Author

I added the normal ranges below. Yes, I had mostly quit eating gluten before the test was done last year. I have been consistently eating it since this past Christmas. I wasn't sure if the results could've been incorrect since I wasn't eating much if any at the time of the test. I have a GI appointment next week and was considering seeing if they'd retest me.

Deamidated Gliadin ABS, IGA - 4 units (0-19 range)

Deamidated Gliadin ABS, IGG - 3 units (0-19 range)

Endomysial Antibody IGA - Negative

Immunoglobulin A, QN, Serum - 211 mg (87-352 range)

TTG IGA - <2 U/mL (0-3 range)

TTG IGG - 9 U/mL (0-5 range)

Scott Adams Grand Master
Scott Adams
Posted

It looks like your tTG-IgA (tissue transglutaminase IgA) Blood Test for Celiac Disease was high, which could mean that you have celiac disease. Your doctor may want to schedule an endoscopy to confirm the results, and for this you would need to continue eating lots of gluten daily until that that is finished. Do you have any symptoms which led you to be tested? 

This article might be helpful. It breaks down each type of test, and what a positive results means in terms of the probability that you might have celiac disease:

Quote

The sensitivity of the tTG-IgG blood test is generally high, ranging from 85% to 98%. This means that the test can accurately detect celiac disease in a significant percentage of people who have the condition.

The specificity of the tTG-IgG blood test is also high, typically around 90% to 98%. This indicates that the test can effectively rule out celiac disease in individuals who do not have the condition.

 

 

Brown42186 Rookie
Brown42186
Posted
  • Author

Yes, I'm constantly bloated to the point it feels like my stomach will pop and have inconsistent bowel habits. I'm either constipated or have diarrhea, never really just normal. I sometimes have mucus in my poop. I get nauseous after I eat. My stomach never really feels good. I'm exhausted all the time and have started being anxious. I'm assuming maybe celiac or just a gluten sensitivity or IBS. I don't feel like the first GI I went to really wanted to do much. My primary care doctor did the celiac test and then it just went nowhere. I go to a different GI next week.

Scott Adams Grand Master
Scott Adams
Posted

At the very least this seems like it could be non-celiac gluten sensitivity.  Approximately 10x more people have non-celiac gluten sensitivity than have celiac disease, but there isn’t yet a test for NCGS. If your symptoms go away on a gluten-free diet it would likely signal NCGS.

If you want a formal diagnosis the next step would likely be an endoscopy, but again, this would reveal whether or not you have celiac disease, but you still could have NCGS.

 

 

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Brown42186 Rookie
Brown42186
Posted
  • Author

Thanks for all the info! I'll see how my appointment next week goes. I think I'm going to push for having a blood test done again since I've been consistently eating gluten and go from there.

trents Grand Master
trents
Posted

Scott, am I missing something? For the TTG-IGA normal is anything 3 or less and his score less than 2. I think that one is in normal range. @Brown42186, if the GI doc is not interested in doing an endoscopy with biopsy of the small bowel lining based on the elevated TTG-IGG I would request a repeat on the bloodwork now that you have resumed gluten consumption again.

Scott Adams Grand Master
Scott Adams
Posted

This test was positive according to the original post, so the next normal step would be a biopsy:
TTG IGG - 9 U/mL (0-5 range)

@Brown42186 Here is more info about how to do a gluten challenge for a celiac disease blood panel, or for an endoscopy:

Quote

"...in order to properly diagnose celiac disease based on serology and duodenal histology, doctors need patients to be on gluten-containing diets, even if they are causing symptoms, and this is called a "gluten challenge."

  • Eat gluten prior to celiac disease blood tests: The amount and length of time can vary, but is somewhere between 2 slices of wheat bread daily for 6-8 weeks and 1/2 slice of wheat bread or 1 wheat cracker for 12 weeks 12 weeks;
  • Eat gluten prior to the endoscopic biopsy procedure: 2 slices of wheat bread daily for at least 2 weeks;

and this recent study recommends 4-6 slices of wheat bread per day:

 

 

trents Grand Master
trents
Posted

Yes, the TTG-IGG was positive but not the TTG-IGA.

Scott Adams Grand Master
Scott Adams
Posted

Understood, and with any positive blood test the usual next step is a biopsy to confirm celiac disease, and this would be true even if the tTg-IgA is negative.

MCS Rookie
MCS
Posted

I had similar issues. My stomach was so bloated I was totally uncomfortable. I would wake up ok but first time I ate anything it was like I was 9 months pregnant. I felt tenderness everywhere in my abdomen and like you seemed to be always constipated. They did ultra sounds and said everything ok you are just constipated. I knew it had to be more. Took 2 years but after reading up on all my symptoms which got worse I decided to stop gluten. Within 2 weeks felt better. After 2 months if I mistakenly ate something with gluten I got violently ill. Finally got in to see good Gastrointerologist and although the test results were not 100 conclusive since I was gluten free 5 months already, he did other tests and endoscopy. Results Celiac. Has been 1 year gluten free and I realized last week I have had no bloating for last few weeks. Takes a while to get better for sure. I also hair loss (low iron), low sodium and bunch of other issues to work on from Celiac. I am still off dairy, oats even gluten free oats, and take Iron, B12 and Calcium which you have to stagger to not adversely impact iron absorption. However it is well worth it. GOOD LUCK and keep pushing the docs, it is your health.

  • 1 month later...
Brown42186 Rookie
Brown42186
Posted
  • Author

Hi again! I just wanted to update here that the GI redid my bloodwork and the ome value is still high so I'm having an endoscopy tomorrow. I also got diagnosed with EPI which seems to possibly be linked to celiac according to Google.

Scott Adams Grand Master
Scott Adams
Posted

Thanks for the update! It’s great that your GI is being thorough with the follow-up testing—hopefully the endoscopy will give you clearer answers. The EPI diagnosis is interesting; I’ve read that celiac can sometimes lead to pancreatic issues like EPI due to long-term malabsorption or autoimmune overlap. Have they mentioned if your EPI might improve with a gluten-free diet if celiac is confirmed? Wishing you smooth sailing with the endoscopy tomorrow—let us know how it goes.

trents Grand Master
trents
Posted
(edited)
54 minutes ago, Brown42186 said:

Hi again! I just wanted to update here that the GI redid my bloodwork and the ome value is still high so I'm having an endoscopy tomorrow. I also got diagnosed with EPI which seems to possibly be linked to celiac according to Google.

ome value? Is that a typo? I don't see that on any of the test results you post and I've never heard of that one.

Edited by trents
Brown42186 Rookie
Brown42186
Posted
  • Author

That was a typo. It was supposed to be one.

I still don't have my biopsy results from my endoscopy, but the findings according to my paperwork were grade B esophagitis and localized continuous erythema and friability of the mucosa in the antrum which is compatible with gastritis. She took lots of biopsies of my stomach, esophagus, and small intestine. Hoping to find out results this week!

Scott Adams Grand Master
Scott Adams
Posted

Please let us know how it turns out.

Brown42186 Rookie
Brown42186
Posted
  • Author

Hi again! The biopsies from my endoscopy didn't show anything abnormal. The GI said I have EPI like I already said, acid reflux that I didn't know I have, and probably a gluten intolerance since it's showed up on allergy testing.

trents Grand Master
trents
Posted

So, if you know from experience that gluten causes you issues because when you eliminate it you definitely feel better, then in light of your negative biopsy results it looks like you have NCGS (Non Celiac Gluten Sensitivity). NCGS still calls for gluten free eating and some experts believe it can transition into celiac disease.

Brown42186 Rookie
Brown42186
Posted
  • Author

I'm planning on eliminating it from my diet and seeing how that goes.

trents Grand Master
trents
Posted

NCGS is 10x more common than celiac disease.

This should help you get off to a good start: 

 

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      My bad. I should have reread your first post as for some reason I was thinking your TTG was within normal range. While we are talking about celiac antibody blood work, you might not realize that there is not yet an industry standard rating scale in use for those blood tests so just having a raw number with out the reference scale can be less than helpful...
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      Thank you for responding. I didn't intentionally reduce gluten prior to the endoscopy though I dont generally eat a lot of it due to the unpleasant symptoms. I was under the impression my TTG of 87.4 was very high, at least that's what my doctor said.
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    • cristiana
      Coeliac or not coeliac

      By cristiana · Posted

      Hello @CC90 Can I just ask a question: have you actually been told that your biopsy were normal, or just that your stomach, duodenum and small intestine looked normal? The reason I ask is that when I had my endoscopy, I was told everything looked normal.  My TTG score was completely through the roof at the time, greater than 100 which was then the cut off max. for my local lab.  Yet when my biopsy results came back, I was told I was stage 3 on the Marsh scale.  I've come across the same thing with at least one other person on this forum who was told everything looked normal, but the report was not talking about the actual biopsy samples, which had to be looked at through a microscope and came back abnormal.
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      Coeliac or not coeliac

      By trents · Posted

      My bad. I should have reread your first post as for some reason I was thinking your TTG was within normal range. While we are talking about celiac antibody blood work, you might not realize that there is not yet an industry standard rating scale in use for those blood tests so just having a raw number with out the reference scale can be less than helpful, especially when the test results are marginal. But a result of 87.4 is probably out of the normal range and into the positive range for any lab's scale. But back to the question of why your endoscopy/biopsy didn't show damage despite significantly positive TTG. Because they took the trouble to take seven samples, it is not likely they missed damage because of it being patchy. The other possibility is that there hasn't been time for the damage to show up. How long have you been experiencing the symptoms you describe in your first post? Having said all that, there are other medical conditions that can cause elevated TTG-IGA values and sometimes they are transient issues. I think it would be wise to ask for another TTG-IGA before the repeat endoscopy to see if it is still high.  Knitty kitty's suggestion of getting genetic testing done is also something to think about. About 35% of the general population will have one or both genes that are markers for the potential to develop active celiac disease but only about 1% of the population actually develop celiac disease. So, having a celiac potential gene cannot be used to definitively diagnose celiac disease but it can be realistically used to rule it out if you don't have either of the genes. If your symptoms persist, and all testing is complete and the follow-up endoscopy/biopsy still shows no damage, you should consider trialing a gluten free diet for a few months to see if symptoms improve. If not celiac disease, you could have NCGS (Non Celiac Gluten Sensitivity). 
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      Coeliac or not coeliac

      By knitty kitty · Posted

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      Thank you for responding.  I didn't intentionally reduce gluten prior to the endoscopy though I dont generally eat a lot of it due to the unpleasant symptoms. I was under the impression my TTG of 87.4 was very high, at least that's what my doctor said.  
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