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When To Do A Skin Biopsy

krisb

By krisb
in Dermatitis Herpetiformis

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krisb Contributor
krisb
Posted

Since I've been gluten free a year ago the blisters on my elbows have been perfect unless I go out to eat and don't question the food. I never had a biopsy but I might in the future. Anyway, I went to Friendly's to eat the other day and my elbows are raging and I have blisters all in my mouth. I didn't question what I ate because I am pregnant and was starving. I'm assuming that the sauces on my chicken had gluten. Should I go and have it biopsied while it's inflamed? Or maybe I should just wait until I'm done being prego. Either way i know gluten does this to me but it would be good to know if it was DH. How long after a breakout can you do a biopsy? I figure that by time I get an appointment to do it my elbows will be better.

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Michi8 Contributor
Michi8
Posted
Since I've been gluten free a year ago the blisters on my elbows have been perfect unless I go out to eat and don't question the food. I never had a biopsy but I might in the future. Anyway, I went to Friendly's to eat the other day and my elbows are raging and I have blisters all in my mouth. I didn't question what I ate because I am pregnant and was starving. I'm assuming that the sauces on my chicken had gluten. Should I go and have it biopsied while it's inflamed? Or maybe I should just wait until I'm done being prego. Either way i know gluten does this to me but it would be good to know if it was DH. How long after a breakout can you do a biopsy? I figure that by time I get an appointment to do it my elbows will be better.

I believe a biopsy can be done at any point (regardless if a lesion is active or not.) The key is that the tissue is taken from the normal skin beside the lesion, not the lesion itself.

In terms of biopsing during pregnancy, that is up to you. However, I believe you should be vigilant about staying 100% gluten free to ensure you have a healthy pregnancy and birth.

Michelle

Guest Educator
Guest Educator
Posted

My drmatologist said the biopsy has to be done on a blister that has not yet opened to get accurate results, otherwise the test will return non-conslusive or maybe as a false negative. I say get it ithere as soon as you can. Being pregnant doesn't matter. The biopsy is a simple slice of the effected area where the non bursted blister is. Good luck and best wishes. Kris

My drmatologist said the biopsy has to be done on a blister that has not yet opened to get accurate results, otherwise the test will return non-conslusive or maybe as a false negative. I say get it ithere as soon as you can. Being pregnant doesn't matter. The biopsy is a simple slice of the effected area where the non bursted blister is. Good luck and best wishes. Kris

Michi8 Contributor
Michi8
Posted
My drmatologist said the biopsy has to be done on a blister that has not yet opened to get accurate results, otherwise the test will return non-conslusive or maybe as a false negative. I say get it ithere as soon as you can. Being pregnant doesn't matter. The biopsy is a simple slice of the effected area where the non bursted blister is. Good luck and best wishes. Kris

Is your dermatologist saying that the sample must be taken from the lesion or beside the lesion? If it is from the lesion, then he is incorrect... Peter H.R. Green, MD, Director of the Celiac Disease Center at Columbia University, wrote on the subject of skin biopsy for DH in his recent book.

From Celiac Disease: A Hidden Epidemic:

"The gold standard for diagnosis is a skin biopsy of uninvolved skin adjacent to an eruption -- best taken within millimeteres of a lesion. The biopsy must be done by a knowledgeable dermatologist because a sampling of tissue from the eruption itself can be confused with other skin conditions. A biopsy of the actual lesion will give a characteristic appearance, but it is not possible to do the immunological staining that is necessary to make the diagnosis. This is because the inflammatory reaction in the blistering lesion destroys the early signs of the immune deposits that are still present in adjacent tissue."

I believe not all (or many?) dermatologists are familiar enough with Celiac and DH to test properly, and some will even insist that the biopsy must be of the actual lesion. Perhaps that is standard when testing for other health issues, but as mentioned in the above quote, testing for DH in this manner gives inaccurate results.

Michelle

krisb Contributor
krisb
Posted
  • Author

How do you find a good dermatologist that knows how to do it right?

Michi8 Contributor
Michi8
Posted
How do you find a good dermatologist that knows how to do it right?

I'd ask here to see if anyone has recommendations of drs in your area. I can't give you my dermatologist's name, because he did the biopsy wrong (and got a negative result of course!) :angry:

Michelle

Fiddle-Faddle Community Regular
Fiddle-Faddle
Posted

Does anyone know why UNINVOLVED, apparently healthy skin should be biopsied? I know Peter Green is the reigning deity of celiac MD's, but he also says the gold standard of diagnosis is the intestinal biopsy, and I certainly don't agree with him there!

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Michi8 Contributor
Michi8
Posted
Does anyone know why UNINVOLVED, apparently healthy skin should be biopsied? I know Peter Green is the reigning deity of celiac MD's, but he also says the gold standard of diagnosis is the intestinal biopsy, and I certainly don't agree with him there!

The reason was in the paragraph I quoted. :) Dr Green is not the only source of this information. Biopsy (skin & intestinal), for good or bad, is still considered to be the gold standard, and will be until other testing methods become standard. Personally, I put more faith in the word of a Dr who specializes in the study and treatment of celiac disease, than in a dermatologist who does not specialize in it.

Michelle

Fiddle-Faddle Community Regular
Fiddle-Faddle
Posted
The reason was in the paragraph I quoted. :) Dr Green is not the only source of this information. Biopsy (skin & intestinal), for good or bad, is still considered to be the gold standard, and will be until other testing methods become standard. Personally, I put more faith in the word of a Dr who specializes in the study and treatment of celiac disease, than in a dermatologist who does not specialize in it.

Michelle

Absolutely! Hmm, somehow I missed the paragraph of explanation. Serves me right for skimming, I suppose!

I'm just questioning it because I had what I'm reasonably sure was DH (it led to the blood test that showed my IgA off the charts), and when I went off gluten, the rash disappeared (as did the stomach problems that I had been ignoring to the point where I didn't realize I had any until they went away). My skin biopsy--taken from unblemished skin next to the lesions--was totally negative.

Dr. Green does not address the fact that most PCP's and even most dermatologists, will prescrible Prednisone to get rid of the rash way before they decide to biopsy to find the cause of it. I believe that Prednisone taken within a month or two (or maybe more?) of the biopsy screws up the test results.

I don't give a flying fig about gold standards: there is no good reason to biopsy the intestines if there is a positive response to the diet and no other problems. Intestinal biopsy is not only invasive, it is only useful if the MD happens to biopsy the right sites. Not all villi are affected at the same rate!

Michi8 Contributor
Michi8
Posted
Absolutely! Hmm, somehow I missed the paragraph of explanation. Serves me right for skimming, I suppose!

I'm just questioning it because I had what I'm reasonably sure was DH (it led to the blood test that showed my IgA off the charts), and when I went off gluten, the rash disappeared (as did the stomach problems that I had been ignoring to the point where I didn't realize I had any until they went away). My skin biopsy--taken from unblemished skin next to the lesions--was totally negative.

Dr. Green does not address the fact that most PCP's and even most dermatologists, will prescrible Prednisone to get rid of the rash way before they decide to biopsy to find the cause of it. I believe that Prednisone taken within a month or two (or maybe more?) of the biopsy screws up the test results.

Dr Green does go on to say, "No tests in medicine are 100 percent, not everyone with dermatitis herpetiformis will have a positive skin biopsy. A negative biopsy should not necessarily be used to exclude the diagnosis if the legions look and act like dermatitis herpetiformis and occur after the ingestion of gluten. Patients should be retested, making sure that both the lab technique and specimen taken are appropriate for determining the diagnosis."

Michelle

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