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Screening BODY HANDBOOK
Screening · §106
Celiac Follow-Up and Family Screening
A celiac diagnosis isn't the end of the work — it's the start of a follow-up stack most patients never get told about in plain English. Feeling better on a gluten-free diet doesn't mean the gut has healed: in the largest Mayo cohort with paired biopsies, only about a third of adults had healed villi at two years, and two-thirds at five — while four in five felt fine clinically. The follow-up labs catch the nutrient gaps the damaged gut left behind. The bone scan catches the osteoporosis that quietly built up before diagnosis. And every parent, sibling, and child of yours has roughly a one-in-ten chance of carrying the same disease, often with no symptoms loud enough to notice. Six things to actually do — yearly labs, bone scan, dietitian, family testing, and the call on the follow-up biopsy — and why each one earns its place.
Do · Yearly Evidence Moderate Chapter Screening

The strongest single argument for follow-up: people whose gut hasn't actually healed carry roughly three times the lymphoma risk of people who did (Lebwohl et al. 2013), and the only way to tell who's in which group is to look. The rest of the protocol — a yearly antibody draw, a nutrient panel, a bone-density scan, a dietitian relationship in year one — exists because feeling fine and being fine are not the same thing in celiac, and because each of your first-degree relatives is sitting on a one-in-ten chance of carrying the disease themselves (Singh et al. 2015). None of it is daily work. Most of it is a single morning a year.

The disconnect to internalise is between three things that drift apart in celiac and are easy to confuse: how you feel, what your antibodies say, and what your gut actually looks like. Symptoms clear first — most people on a strict gluten-free diet feel substantially better within months. Antibody titres (the tTG-IgA blood test) fall next, usually over six to twelve months (Husby et al. 2019). The villi themselves — the absorptive fingers lining the small intestine — heal last, and in a lot of adults they never fully heal. About a third of adults are healed at two years, two-thirds by five years; the rest live with ongoing damage on a diet they believe is strict (Rubio-Tapia et al. 2010).

That gap is the whole reason a follow-up protocol exists. The bloodwork is not just a check on whether you're eating gluten on purpose — it's a check on whether your body is still being injured by gluten you didn't know was there. Restaurant kitchens, shared toasters, soy sauce, malt vinegar, the seasoning on a bag of crisps. Patient registries report that roughly three in four celiacs were accidentally exposed in the last month. Yearly labs and an honest dietitian visit are the system that catches the slow drift.

Why the gut-healing question is worth asking

The reason this isn't paranoid medicine: there's a real difference in long-term outcome between the celiacs whose gut heals on the diet and the ones whose doesn't. The Swedish population cohort with paired biopsies — about 7,600 patients — is the cleanest read on what's at stake.

The cancer at issue — enteropathy-associated T-cell lymphoma — is rare in absolute terms, but it's deadly when it happens and concentrated in exactly the people whose villi never healed. The relevant comparison isn't healthy people; it's two versions of you, one whose intestine recovered and one whose didn't. The version whose gut quietly stays inflamed is the one carrying the risk.

The same gut damage drives the second-order effects readers feel more directly. About one in three newly-diagnosed adults has iron-deficiency anemia, four in five have at least one micronutrient running low, and the most common deficiency at diagnosis is zinc — present in roughly 59% of patients (Bledsoe et al. 2019) (Wierdsma et al. 2013). None of that resolves on its own from a gluten-free diet alone; the damaged gut absorbs them poorly even after the trigger is gone, and most gluten-free foods aren't fortified the way wheat-based foods are. Without the yearly labs and the targeted supplementation that follows, these run for years.

And then there's the bone story. Roughly a third of adults have osteopenia and another third have osteoporosis at the time of celiac diagnosis — most without ever having broken a bone or thought about it. Celiac roughly doubles fracture risk in case-control studies, and lifts hip-fracture risk by about 70% in long-term follow-up (Heikkilä et al. 2015) (Olmos et al. 2008). The baseline DXA is what tells you whether you're walking around with hidden bone loss; without it, the first time you find out is when something breaks.

What to actually do, year by year

The American College of Gastroenterology's 2023 update is the most recent explicit playbook for adults (Rubio-Tapia et al. 2023), with the British and European guidelines tracking it closely (Ludvigsson et al. 2014). The pieces below are the converged core; the disputed pieces are flagged.

The first year

Three to four clinic visits, typically at three, six, and twelve months. A dietitian appointment is not optional — it's the single highest-yield intervention in year one and most guidelines treat it as mandatory (Rubio-Tapia et al. 2023). Without it, the rate of inadvertent gluten exposure stays high and so does the rate of persistent villous damage.

Repeat tTG-IgA at six months and twelve months — falling titres confirm the diet is working; rising or stuck-positive titres mean gluten is getting through somewhere and the dietitian visit needs to happen again (Husby et al. 2019). Recheck any deficient nutrients at three to six months.

Every year after that

The bone scan

The American guideline says a DXA at diagnosis for adults and another every two to three years (Rubio-Tapia et al. 2023). The British and European guidelines limit repeat scans to people who had abnormal baseline results, or to adults over 55 with extra risk factors (Ludvigsson et al. 2014). The reasonable middle path: get the baseline scan; if it's normal and you have no other risk factors, you can stretch the next one out to five years. If it shows osteopenia or osteoporosis, you need a treatment plan and earlier recheck.

The follow-up biopsy

This is the contested one. A repeat upper-endoscopy biopsy at the two-year mark is the only direct way to confirm the gut has healed. The case for doing it: persistent villous damage is the single best marker of long-term lymphoma risk and a substantial fraction of patients with normal antibodies still have ongoing damage (Lebwohl et al. 2013). The case against: it's an invasive procedure with sedation, the same Swedish cohort found no all-cause mortality difference between healed and not-healed groups (Lebwohl et al. 2013), and there's no trial proving the biopsy result changes patient-level decisions. The American guideline now phrases it as "consider after shared decision-making at two years" (Rubio-Tapia et al. 2023). In symptomatic patients, or anyone whose antibodies haven't come down, the biopsy is no longer optional — it's how refractory celiac gets diagnosed.

Your family is also part of this

This is the piece that gets dropped the most often and matters the most per dollar spent. Every parent, full sibling, and biological child of yours has roughly a one-in-ten chance of also carrying celiac disease — about a sevenfold rise over the general population's one-in-a-hundred, with sisters and daughters carrying the highest risk (Singh et al. 2015). Most of them don't know it. Up to six in ten relatives who screen positive call themselves asymptomatic until you ask them in detail, and then it turns out the chronic fatigue, the iron-deficiency anemia, the brain fog, the chronic diarrhoea a doctor once waved off as IBS — all of it they'd attributed to getting older or being stressed — has been the disease all along.

One option worth knowing about: a one-time HLA-DQ2/DQ8 gene test (a cheek swab) can essentially rule out future risk in a relative who's gene-negative. About 30-40% of the population carries one of these alleles; if the test comes back clean, that relative is statistically very unlikely to ever develop celiac and doesn't need repeated screening. If the gene test is positive, it doesn't mean they have the disease — only that they could develop it — and the tTG follow-up continues.

Where this falls apart

  • Dropping out after year one. The most common failure. Patient feels well, dietitian visits stop, antibody draws lapse, the family never gets tested. The slow drift of inadvertent gluten exposure stops being caught. Refractory celiac — the 1-2% of patients who don't heal despite genuine adherence — goes undiagnosed for years.
  • Trusting the antibody by itself. The tTG-IgA is roughly 50% sensitive for persistent gut damage (Husby et al. 2019). If symptoms have not resolved, or have come back, the next step is endoscopy and biopsy — not reassurance that the bloodwork is fine.
  • Missing IgA deficiency at baseline. About 2-3% of celiacs are selectively IgA-deficient, and in those patients the tTG-IgA reads falsely negative forever. Total IgA on the first draw catches this; switch to IgG-based antibodies if it's low (Husby et al. 2019).
  • Relatives going gluten-free before being tested. The most common screening failure. Once someone has been off gluten for weeks, the antibody normalises and the biopsy improves — the workup becomes uninformative. Eat gluten until tested.
  • Quiet cross-contamination drift. A year of restaurant meals, shared kitchen tools, and "this should be safe" can re-establish low-grade exposure without the patient noticing. A yearly dietitian visit catches what self-monitoring misses.
  • Not actually replacing what's low. A nutrient panel that shows a deficiency only helps if the supplementation happens. Iron, vitamin D, B12, and zinc replacement need to be tracked to the point of normal levels, then maintained.

What changes when you stay on it

Within six months, the antibody titres are falling and the dietitian has caught the things you didn't realise were gluten — the soy sauce, the malt-flavoured cereal, the shared toaster, the seasoning on a snack. The fatigue floor that the gluten-free diet alone couldn't lift comes off once iron and B12 are replaced; people around you stop commenting that you look tired.

By the end of year one, the bone scan has either given you a clean baseline you'll keep or flagged osteopenia early enough to do something about — calcium, vitamin D, weight-bearing exercise, and where indicated, anti-osteoporotic medication. Either way, the surprise hip fracture in your sixties becomes less likely.

By year two, the second antibody trend confirms the diet is holding, and the call on whether to repeat the biopsy is no longer abstract: you have a real conversation about whether your symptoms and antibodies are consistent enough with healed villi to skip it. Patients who do heal histologically have lymphoma risk that sits roughly at the general-population baseline (Lebwohl et al. 2013) — the surveillance has paid its way.

The bigger compound effect is at the family level. The sister who'd been chronically iron-deficient gets diagnosed at 38 instead of 53, the brother whose anxiety turned out to be undiagnosed celiac goes through a different decade, the kid who would have grown poorly catches it before puberty. A 7.5% chance per relative, plus three or four relatives — the math says someone in your family is going to test positive, and finding them early is most of the lasting value of the whole exercise (Singh et al. 2015).

Related rabbit holes

  • The gluten-free diet itself — what counts as gluten, cross-contamination habits, label-reading, eating out — is its own large topic and the dietitian visits are the place to learn it.
  • Refractory celiac disease — the rare 1-2% who don't heal on strict adherence — needs specialist care beyond standard follow-up.
  • Non-celiac gluten sensitivity is a different condition with overlapping symptoms but no autoimmune component or family-screening implications.
  • Other autoimmune conditions overrepresented in celiac patients — type 1 diabetes, autoimmune thyroid, dermatitis herpetiformis — are worth knowing about and worth periodic screening for, separate from this entry.
  • Bone-density treatment (calcium, vitamin D dosing, bisphosphonates) sits adjacent to the DXA result but is its own decision.
Related in the handbook
Diagnosis
  • — Chronic diarrhoea written off as IBS is a common way undiagnosed celiac hides; testing settles it.
  • — If your celiac diagnosis was never nailed down, this gene test can rule it out for good — no going back on gluten.
Related
  • — A damaged gut leaves nutrient gaps — iron is the classic one, which is why follow-up labs check ferritin.
  • — Anyone who reacts to wheat needs celiac excluded before self-diagnosing a milder sensitivity; the test only works on a gluten-containing diet.
  • — Celiac quietly thins bone before diagnosis — the bone-density scan is part of follow-up for a reason.
  • — A damaged gut absorbs fat-soluble vitamins poorly, so low vitamin D is common, and it feeds the bone loss the scan checks for.
  • — Celiac travels with other autoimmune diseases, thyroid especially. Part of follow-up is staying alert for the next one.
  • — Celiac travels with type 1 diabetes — same autoimmune genes. If T1D runs in the family too, ask about screening relatives.
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