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How Accurate Is Prometheus Celiac Genetics Test?

JohnS

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JohnS Newbie
JohnS
Posted

Mine came back  <0.1x  which they state on the results as EXTREMELY LOW

 

Is this a reliable test?

 

So far my test results from eveything are"

 

Endoscopy with 9 biopsies ... Neg

Anti gilandin antibodies  ...  1:10   stated as borderline

Transgulatminase ab IgA  ... 60.9        neg is <15

  """""""                       IgG  ... < 15        neg is <15

 

Anti  Saccaromyces Antibody ... 32.1    neg is <20.1

Saccharomyces Cerevisiaw Ab Test  50.4   neg is <20.1

 

Went back to eating as much gluten as I wanted, everyday for 2 months before endoscopy, felt the same as I did when I was gluten free for 1 year+

 

What say you?

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kareng Grand Master
kareng
Posted

I don't really understand the genetics results? Are they saying you do not have either of the .celiac genes so that makes it very very unlikely that you have Celiac?

JohnS Newbie
JohnS
Posted
  • Author

I don't really understand the genetics results? Are they saying you do not have either of the .celiac genes so that makes it very very unlikely that you have Celiac?

That is correct, the genes they test are DQ2 which 95% of all Celiacs have, and DQ8, which 5% of Celiacs have, combined I am

DQ2-. DQ8-

 

This test does not depend on eating gluten or not, you can be gluten free for 10 years, that will not change your genes, either you have it or you don't. 

 

But is it an accurate test?

kareng Grand Master
kareng
Posted

I understand which genes they test for. I don't see any reason gene tests from Prometheus wouldn't be accurate. I think it is a standard CYA disclaimer with gene tests to say they have a 99.9% accuracy.

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JohnS Newbie
JohnS
Posted
  • Author

I understand which genes they test for. I don't see any reason gene tests from Prometheus wouldn't be accurate. I think it is a standard CYA disclaimer with gene tests to say they have a 99.9% accuracy.

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Anyone, do I have Celiac or not.  THere is no census of opionion by my GI doctors, 2 say yes, 2 say no.  Need a tie breaker.

 

If NO, then what would cause the high numbers on some tests?

answerseeker Enthusiast
answerseeker
Posted

Anyone, do I have Celiac or not.  THere is no census of opionion by my GI doctors, 2 say yes, 2 say no.  Need a tie breaker.

 

If NO, then what would cause the high numbers on some tests?

not sure what these are, they are not celiac tests?

Anti  Saccaromyces Antibody ... 32.1    neg is <20.1

Saccharomyces Cerevisiaw Ab Test  50.4   neg is <20.1

 

with negative biopsy taking 9 samples and you do not have the genes, your chances of having celiac are very slim

frieze Community Regular
frieze
Posted

not sure what these are, they are not celiac tests?

Anti  Saccaromyces Antibody ... 32.1    neg is <20.1

Saccharomyces Cerevisiaw Ab Test  50.4   neg is <20.1

 

with negative biopsy taking 9 samples and you do not have the genes, your chances of having celiac are very slim

sometimes positive in celiac, more often in crohn's

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kareng Grand Master
kareng
Posted

Anyone, do I have Celiac or not. THere is no census of opionion by my GI doctors, 2 say yes, 2 say no. Need a tie breaker.

If NO, then what would cause the high numbers on some tests?

I gave you a link. Trying not to diagnose you or scare you but - get your liver checked. Get checked for other AI diseases. Chron's? Colitis? I'm sorry. It's highly unlikely you have Celiac. What was the result of your colonoscopy biopsies? That is likely your problem.
IrishHeart Veteran
IrishHeart
Posted

No one here can be a "tie breaker" for you, hon.  Sorry.We're not doctors.

Gene tests are reliable, but gene tests do not diagnose celiac.

They can be used to rule it out, but we have seen at least 2 diagnosed celiacs who post on here with genes other than DQ2 and DQ8.

 

You may need further testing and another medical opinion. 

From what I understand, Crohn's and ulcerative colitis are usually diagnosed by symptoms, barium scans, blood work and a positive  Anti  Saccaromyces Antibody test 

 

Other diseases in which ASCA are found:

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    • Open Original Shared Link
      • Collagenous colitis
  • Open Original Shared Linkse

 

If I were you, I'd seek  more opinions until I got a definitive answer. And by that, I mean medical opinions. Best wishes.

gatita Enthusiast
gatita
Posted

One thing that always amazes me about the gene test is most experts say 97% of celiacs have DQ 2 or 8.

 

Which means 3 percent of celiacs don't have either one!

 

And yet doctors always act as if a negative gene test is proof you don't have it. Since I'm DQ9, I often wonder if I'm just one of the 3 percenters.

kareng Grand Master
kareng
Posted

One thing that always amazes me about the gene test is most experts say 97% of celiacs have DQ 2 or 8.

 

Which means 3 percent of celiacs don't have either one!

 

And yet doctors always act as if a negative gene test is proof you don't have it. Since I'm DQ9, I often wonder if I'm just one of the 3 percenters.

 

The doctors I heard speak said it is rarer than 3% of Celiacs & if someone doesn't have the genes, they don't have Celiac.  Basically, it is extremely rare if anyone without the genes actually has Celiac. 

Renaye Contributor
Renaye
Posted

I am another prometheus celiac plus person. My results were a postive DGP IgG and DGP IgA only. The genetics part was unable to interpret. Mine says that there were substances present in the sample that interfere with the HLA typing method. I have searched and can't find out what else this means. I had a negative biopsy, but positive ANA. Being treated with plaquenil for sjogren's but the doctor does not believe that this one is primary.

I feel like I just dumped a lot of $ for a test that is inconclusive and the doctor wants to do another one. John, I agree, how accurate is the test and where do you go from here. I figure, now, go gluten free because I definitely have something autoimmune going on and since gluten-free diet helps with inflammation and thyroid, I don't want any more problems. I just wonder about my kids.....

Renaye

kareng Grand Master
kareng
Posted

I am another prometheus celiac plus person. My results were a postive DGP IgG and DGP IgA only. The genetics part was unable to interpret. Mine says that there were substances present in the sample that interfere with the HLA typing method. I have searched and can't find out what else this means. I had a negative biopsy, but positive ANA. Being treated with plaquenil for sjogren's but the doctor does not believe that this one is primary.

I feel like I just dumped a lot of $ for a test that is inconclusive and the doctor wants to do another one. John, I agree, how accurate is the test and where do you go from here. I figure, now, go gluten free because I definitely have something autoimmune going on and since gluten-free diet helps with inflammation and thyroid, I don't want any more problems. I just wonder about my kids.....

Renaye

 

 

That sounds like the sample that was sent to them for genetic testing was bad.  Perhaps the lab that drew the blood didn't prepare it properly?   Or a mouth swab that had food or biotene mouth wash coating the inside of the mouth? Maybe they would consider running it again on a "good" sample?  maybe you or the doc should take that to the lab that made the sample and demand they make it right?

IrishHeart Veteran
IrishHeart
Posted

 Mine says that there were substances present in the sample that interfere with the HLA typing method.

 

Karen's right.

Then, the sample was tainted or contaminated  in some way. Not your fault. Not the lab's fault. 

Could be any number of reasons why it happened. It likely lies with whomever collected the blood sample.  

 

(if this were a drug test, let's say....for example, there would be question of what someone took to mask results or what was added to the sample to affect the results)

 

 

My chemist hubs says that is cause for re-testing in any lab he ever worked in.

 

Your primary care doctor can order a genetic test. Mine did and it was covered by insurance (for the most part) I think I paid a $50 or 60 co-pay.

kareng Grand Master
kareng
Posted

Was looking up LabCorp as that is the one my insurance uses for tests.  It said this for either the blood or the mouth swabs:

 

 

"Limitations:

Even with appropriate precautions, an occasional specimen may not be satisfactory for testing. In such cases, fresh specimens should be collected for retesting."

JohnS Newbie
JohnS
Posted
  • Author

I gave you a link. Trying not to diagnose you or scare you but - get your liver checked. Get checked for other AI diseases. Chron's? Colitis? I'm sorry. It's highly unlikely you have Celiac. What was the result of your colonoscopy biopsies? That is likely your problem.

Colonoscopy done earlier this year, one small polyp removed, biospsy neg.

 

Blood test and ultrasound done for liver as part of abdominal US.  All normal.   No GI doc has even mentioned Chron's or UC.  IMO, I may have SIBO, due to previous antiobiotic issues previous to all this starting.  I know when I take an antibiotic, things get better.  When I take a probiotic, get very bloated.  I have told the docs this, in one ear out the other. 

Renaye Contributor
Renaye
Posted

I am scheduled to see a new gastro this week as my old one decided to leave so I will ask him and work with him on the insurance. I remember that day that they took 13 vials of blood from me. Everything else was readable. You never know. Here I kept thinking that I had something else wrong. Wish me luck and thank you!!

Renaye

Ninja Contributor
Ninja
Posted

One thing that always amazes me about the gene test is most experts say 97% of celiacs have DQ 2 or 8.

 

Which means 3 percent of celiacs don't have either one!

 

And yet doctors always act as if a negative gene test is proof you don't have it. Since I'm DQ9, I often wonder if I'm just one of the 3 percenters.

 

I've wondered this too! In all the literature I've read, it is extremely rare for a person to develop celiac without a variation of DQ2 or DQ8. However, the individuals in those studies were tested for all variations of the genes and both alpha and beta units on each loci. It is very unusual to stumble across a doctor who orders that thorough of a genetic test. It seems they either look for DQ2.5 on the alpha side and DQ2, DQ8 on the beta, or just the beta or just DQ2.5 and not DQ2.2. So, from my research, there appears to be some disharmony in the percentages that the studies give and what specificity of tests are used in practice. 

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