{"count":10,"index":{"built_at":"2026-07-27T19:13:49.384467+00:00","public_records":55311,"revision":"be6678e3ec0b72a5beac5f35"},"query":{"area":null,"kind":null,"lang":null,"limit":10,"match_mode":"all_terms","q":"Evidence check: tTG IgA in the context of fatigue"},"results":[{"answer":"The query concerns the biomarker tTG IgA (tissue transglutaminase IgA antibodies) in the context of fatigue. The provided knowledge base contains no information about tTG IgA, celiac disease, or its symptoms. From general medical knowledge, tTG IgA is a well-established serological marker for celiac disease (gluten-sensitive enteropathy). Fatigue is one of the most common extraintestinal symptoms of undiagnosed celiac disease, and guidelines recommend celiac serology (tTG IgA plus total IgA) in unexplained fatigue. The evidence for this link is strong in the medical literature (numerous cohort studies, meta-analyses). However, the present context cannot support this claim because it lacks any relevant studies or sources. Therefore, the evidence must be rated as 'unclear' here – not because the test is ineffective, but because the provided documents offer no relevant information. A negative tTG IgA largely rules out celiac disease (high negative predictive value); a positive result requires duodenal biopsy for confirmation. Fatigue has many causes; a standalone tTG IgA test without clinical context is insufficient.","area":"gesundheit","canonical_id":"gesundheit:canonical-5e81c35c7f474dc146f49d8a","id":"public-7ba614098df7c7d09082fa80","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of fatigue","score":30.72261508,"snippet":"The query concerns the biomarker tTG IgA (tissue transglutaminase IgA antibodies) in the context of fatigue. The provided knowledge base contains no information about tTG IgA, celiac disease, or its symptoms. From general medical knowledge, tTG IgA is a well-established serological marker for celiac disease (gluten-sensitive enteropathy). Fatigue is one of the most common extraintestinal symptoms of undiagnosed celiac disease, and guidelines recommend celiac serology (tTG IgA plus total IgA) in unexplained fatigue. The evidence for this link is strong in the medical literature (numerous cohort studies, meta-analyses). However, the present context cannot support this claim because it lacks an","sources":[],"title":"Evidence check: tTG IgA in the context of fatigue","url":"https://tikki.wiki/wissen/gesundheit/frage/public-7ba614098df7c7d09082fa80/evidence-check-ttg-iga-in-the-context-of-fatigue/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The question about tTG IgA in the context of fatigue is not addressed in the provided context. From general medical knowledge, tTG IgA is a well-established serological marker for celiac disease, an autoimmune condition that frequently presents with fatigue, iron deficiency, and nonspecific gastrointestinal symptoms. The evidence for tTG IgA in diagnosing celiac disease is strong (sensitivity ~95%, specificity ~98%). However, fatigue is a very nonspecific symptom; a positive tTG IgA should be confirmed by duodenal biopsy before recommending a gluten-free diet. A negative tTG IgA does not completely rule out celiac disease (especially in IgA deficiency or early stages). The provided DNA information (FADS, PPARA, etc.) has no direct relevance to tTG IgA or celiac disease. For a comprehensive workup of fatigue, additional lab tests (complete blood count, ferritin, vitamin B12, vitamin D, thyroid function) are advisable.","area":"gesundheit","canonical_id":"gesundheit:canonical-7963371ef083127a8393151e","id":"public-d11b562635f4b3c4c87da608","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of Müdigkeit","score":30.51336134,"snippet":"The question about tTG IgA in the context of fatigue is not addressed in the provided context. From general medical knowledge, tTG IgA is a well-established serological marker for celiac disease, an autoimmune condition that frequently presents with fatigue, iron deficiency, and nonspecific gastrointestinal symptoms. The evidence for tTG IgA in diagnosing celiac disease is strong (sensitivity ~95%, specificity ~98%). However, fatigue is a very nonspecific symptom; a positive tTG IgA should be confirmed by duodenal biopsy before recommending a gluten-free diet. A negative tTG IgA does not completely rule out celiac disease (especially in IgA deficiency or early stages). The provided DNA infor","sources":[],"title":"Evidence check: tTG IgA in the context of Müdigkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-d11b562635f4b3c4c87da608/evidence-check-ttg-iga-in-the-context-of-muedigkeit/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"tTG IgA (tissue transglutaminase antibodies) is the standard screening test for celiac disease. During menopause, symptoms like fatigue, joint pain, bloating, and mood changes can overlap with celiac disease. However, there is no specific evidence that tTG IgA should be routinely tested in all menopausal women. Screening is only indicated when there are risk factors or suggestive symptoms. The test has high accuracy, but false positives can occur in other autoimmune conditions. The evidence for its use in the context of menopause is best described as practice-based, not strong clinical evidence. Caveat: A positive result should always be confirmed by duodenal biopsy.","area":"gesundheit","canonical_id":"gesundheit:canonical-f4f6ff0e463eabbbc80e1462","id":"public-9780f138954d144211fa5e26","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of Wechseljahre","score":29.53383398,"snippet":"tTG IgA (tissue transglutaminase antibodies) is the standard screening test for celiac disease. During menopause, symptoms like fatigue, joint pain, bloating, and mood changes can overlap with celiac disease. However, there is no specific evidence that tTG IgA should be routinely tested in all menopausal women. Screening is only indicated when there are risk factors or suggestive symptoms. The test has high accuracy, but false positives can occur in other autoimmune conditions. The evidence for its use in the context of menopause is best described as practice-based, not strong clinical evidence. Caveat: A positive result should always be confirmed by duodenal biopsy.","sources":[],"title":"Evidence check: tTG IgA in the context of Wechseljahre","url":"https://tikki.wiki/wissen/gesundheit/frage/public-9780f138954d144211fa5e26/evidence-check-ttg-iga-in-the-context-of-wechseljahre/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The tTG IgA test (tissue transglutaminase IgA) is the recommended first-line serological screening marker for celiac disease. In the context of menopause, diagnosing celiac disease can be challenging because menopausal symptoms such as fatigue, joint pain, and osteoporosis overlap with those of untreated celiac disease. A positive tTG IgA result requires confirmation by duodenal biopsy. However, IgA deficiency (more common in celiac patients) can cause false-negative tTG IgA; in such cases, IgG-based tests (e.g., tTG IgG or DGP IgG) should be used. The evidence for tTG IgA as a screening tool is strong (human-strong), but specific studies on its use during menopause are limited. The test alone does not replace clinical evaluation. Note: The provided context contains no specific information on tTG IgA or menopause; this answer is based on general medical knowledge.","area":"gesundheit","canonical_id":"gesundheit:canonical-37fc9f92fc5c00fd544d7b67","id":"public-d7ee985c04c708e3d87d0658","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of menopause","score":29.53307743,"snippet":"The tTG IgA test (tissue transglutaminase IgA) is the recommended first-line serological screening marker for celiac disease. In the context of menopause, diagnosing celiac disease can be challenging because menopausal symptoms such as fatigue, joint pain, and osteoporosis overlap with those of untreated celiac disease. A positive tTG IgA result requires confirmation by duodenal biopsy. However, IgA deficiency (more common in celiac patients) can cause false-negative tTG IgA; in such cases, IgG-based tests (e.g., tTG IgG or DGP IgG) should be used. The evidence for tTG IgA as a screening tool is strong (human-strong), but specific studies on its use during menopause are limited. The test alo","sources":[],"title":"Evidence check: tTG IgA in the context of menopause","url":"https://tikki.wiki/wissen/gesundheit/frage/public-d7ee985c04c708e3d87d0658/evidence-check-ttg-iga-in-the-context-of-menopause/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"The biomarker tTG IgA (tissue transglutaminase IgA) is a well-established serological marker for diagnosing celiac disease, an autoimmune disorder triggered by gluten. In the context of allergy, however, tTG IgA is not relevant. Allergies are IgE-mediated reactions to environmental substances (e.g., pollen, foods), whereas celiac disease is a T‑cell-mediated autoimmune response to gluten. Confusion sometimes arises because both conditions can present with non-specific symptoms like abdominal pain or fatigue. A positive tTG IgA test indicates celiac disease, not an allergy. Direct-to-consumer tests offering tTG IgA should clearly communicate that this is a celiac screening test. The evidence for tTG IgA in celiac disease is strong (human-strong), but for allergies it is absent. Without specific IgE tests or skin prick tests, allergy diagnostics remain incomplete. Safety note: A positive tTG IgA result should always be followed up by a physician, as untreated celiac disease can lead to long-term complications.","area":"gesundheit","canonical_id":"gesundheit:canonical-8156bc466620d23c63b8300b","id":"public-25902740b8ca858a32293655","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of allergy","score":29.42864084,"snippet":"The biomarker tTG IgA (tissue transglutaminase IgA) is a well-established serological marker for diagnosing celiac disease, an autoimmune disorder triggered by gluten. In the context of allergy, however, tTG IgA is not relevant. Allergies are IgE-mediated reactions to environmental substances (e.g., pollen, foods), whereas celiac disease is a T‑cell-mediated autoimmune response to gluten. Confusion sometimes arises because both conditions can present with non-specific symptoms like abdominal pain or fatigue. A positive tTG IgA test indicates celiac disease, not an allergy. Direct-to-consumer tests offering tTG IgA should clearly communicate that this is a celiac screening test. The evidence ","sources":[],"title":"Evidence check: tTG IgA in the context of allergy","url":"https://tikki.wiki/wissen/gesundheit/frage/public-25902740b8ca858a32293655/evidence-check-ttg-iga-in-the-context-of-allergy/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"tTG IgA (tissue transglutaminase IgA) is a well-established serological marker for celiac disease. In the context of sport, it is occasionally measured in athletes with unexplained gastrointestinal symptoms, fatigue, or performance decline. However, evidence for routine screening in asymptomatic athletes is weak. Celiac disease affects about 1% of the population, and undiagnosed cases can impair athletic performance due to malabsorption of iron, vitamin D, and B12. Yet tTG IgA is not a direct performance or recovery biomarker. A positive test requires gastroenterological follow-up with duodenal biopsy. False positives can occur, especially in IgA deficiency or other autoimmune conditions. Testing should be reserved for clinical suspicion, not as a general sports screening. Evidence is based on clinical practice and guidelines, not on specific sport studies. Caveat: A negative test does not rule out celiac disease, particularly in IgA deficiency (then IgG-based tests are needed).","area":"gesundheit","canonical_id":"gesundheit:canonical-ea109257269ed1f70da1b7a5","id":"public-c3143b52d4020e7a7414ce10","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: tTG IgA in the context of Sport","score":29.35991709,"snippet":"tTG IgA (tissue transglutaminase IgA) is a well-established serological marker for celiac disease. In the context of sport, it is occasionally measured in athletes with unexplained gastrointestinal symptoms, fatigue, or performance decline. However, evidence for routine screening in asymptomatic athletes is weak. Celiac disease affects about 1% of the population, and undiagnosed cases can impair athletic performance due to malabsorption of iron, vitamin D, and B12. Yet tTG IgA is not a direct performance or recovery biomarker. A positive test requires gastroenterological follow-up with duodenal biopsy. False positives can occur, especially in IgA deficiency or other autoimmune conditions. Te","sources":[],"title":"Evidence check: tTG IgA in the context of Sport","url":"https://tikki.wiki/wissen/gesundheit/frage/public-c3143b52d4020e7a7414ce10/evidence-check-ttg-iga-in-the-context-of-sport/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"A celiac disease test (e.g., tTG-IgA or HLA-DQ2/DQ8) can be relevant in fatigue, as undiagnosed celiac is a known cause of chronic tiredness. However, a positive genetic test (HLA) indicates only predisposition, not active disease. Serology (tTG-IgA) is the clinical standard, but false negatives occur, e.g., in IgA deficiency. Without classic symptoms (diarrhea, weight loss), the predictive value of a genetic test for fatigue is low. Evidence for routine celiac screening in isolated fatigue is moderate – guidelines recommend it only in risk groups or with additional symptoms. Consumer DNA tests for celiac are not diagnostic and may cause unnecessary worry or false reassurance. If fatigue persists, consult a physician for proper workup including serology and, if positive, duodenal biopsy.","area":"gesundheit","canonical_id":"gesundheit:canonical-bd0231763e0220aa13ed7b18","id":"public-f6380373122f02940d655073","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Zöliakie Test in the context of fatigue","score":29.20079426,"snippet":"A celiac disease test (e.g., tTG-IgA or HLA-DQ2/DQ8) can be relevant in fatigue, as undiagnosed celiac is a known cause of chronic tiredness. However, a positive genetic test (HLA) indicates only predisposition, not active disease. Serology (tTG-IgA) is the clinical standard, but false negatives occur, e.g., in IgA deficiency. Without classic symptoms (diarrhea, weight loss), the predictive value of a genetic test for fatigue is low. Evidence for routine celiac screening in isolated fatigue is moderate – guidelines recommend it only in risk groups or with additional symptoms. Consumer DNA tests for celiac are not diagnostic and may cause unnecessary worry or false reassurance. If fatigue per","sources":[],"title":"Evidence check: Zöliakie Test in the context of fatigue","url":"https://tikki.wiki/wissen/gesundheit/frage/public-f6380373122f02940d655073/evidence-check-zoeliakie-test-in-the-context-of-fatigue/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"A celiac test in the context of gut health is relevant when symptoms like chronic diarrhea, bloating, fatigue, or nutrient deficiencies are present. Standard diagnostics include IgA antibodies against tissue transglutaminase (tTG-IgA) and total IgA to rule out IgA deficiency. A positive result typically leads to a duodenal biopsy. Genetic testing for HLA-DQ2/DQ8 can rule out celiac disease but cannot confirm it. Home tests offer initial screening but are insufficient for a definitive diagnosis. Evidence for serology is strong (human-strong), while genetic testing serves only as an exclusion criterion. Important: Gluten must still be consumed before testing to avoid false negatives. The provided context lacks specific data on celiac testing, so this answer is based on general medical knowledge. If celiac disease is suspected, medical evaluation is essential.","area":"gesundheit","canonical_id":"gesundheit:canonical-418eed778436dae97b8248ed","id":"public-a556cb2eab6fc83e3fbfda9b","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Zöliakie Test in the context of Darmgesundheit","score":27.31989589,"snippet":"A celiac test in the context of gut health is relevant when symptoms like chronic diarrhea, bloating, fatigue, or nutrient deficiencies are present. Standard diagnostics include IgA antibodies against tissue transglutaminase (tTG-IgA) and total IgA to rule out IgA deficiency. A positive result typically leads to a duodenal biopsy. Genetic testing for HLA-DQ2/DQ8 can rule out celiac disease but cannot confirm it. Home tests offer initial screening but are insufficient for a definitive diagnosis. Evidence for serology is strong (human-strong), while genetic testing serves only as an exclusion criterion. Important: Gluten must still be consumed before testing to avoid false negatives. The provi","sources":[],"title":"Evidence check: Zöliakie Test in the context of Darmgesundheit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-a556cb2eab6fc83e3fbfda9b/evidence-check-zoeliakie-test-in-the-context-of-darmgesundheit/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"A DNA test for celiac disease (HLA-DQ2/DQ8) can indicate genetic predisposition, but it is not a standalone diagnosis. Fatigue is a common symptom of celiac disease, but has many other causes. A positive test increases likelihood, but diagnosis requires serology (tTG-IgA) and duodenal biopsy. A negative test does not rule out non-celiac gluten sensitivity. Evidence for the genetic association is strong (human-strong), but the clinical utility of a consumer genetic test without medical follow-up is limited. Caveat: consumer tests may only cover partial HLA typing.","area":"gesundheit","canonical_id":"gesundheit:canonical-ceb71f95c8c52e7d90d8e8ac","id":"public-8b56fe7ac9ef6d9075c0664a","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Zöliakie Test in the context of Müdigkeit","score":26.65058343,"snippet":"A DNA test for celiac disease (HLA-DQ2/DQ8) can indicate genetic predisposition, but it is not a standalone diagnosis. Fatigue is a common symptom of celiac disease, but has many other causes. A positive test increases likelihood, but diagnosis requires serology (tTG-IgA) and duodenal biopsy. A negative test does not rule out non-celiac gluten sensitivity. Evidence for the genetic association is strong (human-strong), but the clinical utility of a consumer genetic test without medical follow-up is limited. Caveat: consumer tests may only cover partial HLA typing.","sources":[],"title":"Evidence check: Zöliakie Test in the context of Müdigkeit","url":"https://tikki.wiki/wissen/gesundheit/frage/public-8b56fe7ac9ef6d9075c0664a/evidence-check-zoeliakie-test-in-the-context-of-muedigkeit/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}},{"answer":"A celiac test in the context of sports can be useful if an athlete experiences unexplained fatigue, performance decline, or digestive issues. However, diagnosis is not based solely on a DNA test: HLA-DQ2/DQ8 genotyping indicates genetic susceptibility (necessary but not sufficient). Confirmed diagnosis requires serology (tTG-IgA) and duodenal biopsy. A standalone genetic test without clinical follow-up is misleading. For athletes, undiagnosed celiac disease can impair recovery and performance, but the test alone does not replace medical evaluation. Evidence: human-moderate (HLA testing well-established but only as a rule-out). Beware of marketing that presents genetic risk as a diagnosis.","area":"gesundheit","canonical_id":"gesundheit:canonical-ab4d33ddbd42cbac556f898e","id":"public-bdf26241642feb9cdb25374b","kind":"qa","language":"en","publication_status":"existing_native_answer_privacy_screened_sources_pending","question":"Evidence check: Zöliakie Test in the context of Sport","score":26.2953771,"snippet":"A celiac test in the context of sports can be useful if an athlete experiences unexplained fatigue, performance decline, or digestive issues. However, diagnosis is not based solely on a DNA test: HLA-DQ2/DQ8 genotyping indicates genetic susceptibility (necessary but not sufficient). Confirmed diagnosis requires serology (tTG-IgA) and duodenal biopsy. A standalone genetic test without clinical follow-up is misleading. For athletes, undiagnosed celiac disease can impair recovery and performance, but the test alone does not replace medical evaluation. Evidence: human-moderate (HLA testing well-established but only as a rule-out). Beware of marketing that presents genetic risk as a diagnosis.","sources":[],"title":"Evidence check: Zöliakie Test in the context of Sport","url":"https://tikki.wiki/wissen/gesundheit/frage/public-bdf26241642feb9cdb25374b/evidence-check-zoeliakie-test-in-the-context-of-sport/","verification":{"claim_support_verified":false,"human_reviewed":false,"quote_exact_match":false,"source_identity_verified":false,"tier":"existing_native_answer_privacy_screened_sources_pending"}}],"schema_version":"tikki.search-response.v1"}