Enda Annual Screening Autoimmune Diseases

---
name: enda-annual-screening-autoimmune-diseases
description: Suggests periodic screening for autoimmune diseases known to be more prevalent in PAI patients in whom autoimmune origin of PAI has not been excluded; optimal frequency unknown but can be done annually. Use when determining screening schedule for PAI patient with uncertain autoimmune origin.
---

# Screen Annually for Autoimmune Diseases More Prevalent in PAI Patients

## STEP 1 — Gather Information
Confirm diagnosis of primary adrenal insufficiency (PAI) and assess whether autoimmune origin has been excluded (e.g., 21-hydroxylase antibody testing). Collect patient age, sex, and any known autoimmune comorbidities. If autoimmune serology status is unknown, order 21-hydroxylase antibody test.

## STEP 2 — Rule In / Rule Out
Is autoimmune origin of PAI excluded by negative 21-hydroxylase antibodies?  
- **Yes**: Stop; annual autoimmune screening per this guideline not indicated.  
- **No or unknown**: Proceed to step 3.

## STEP 3 — Classify or Stratify
Classify patient as requiring annual screening for autoimmune conditions more prevalent in PAI with uncertain autoimmune origin: thyroid disease, type 1 diabetes mellitus, premature ovarian failure, celiac disease, and autoimmune gastritis with vitamin B12 deficiency.

## STEP 4 — Decide
Order annual screening labs: TSH and free T4 for thyroid disease; HbA1c for diabetes; serum vitamin B12 and anti-parietal cell antibody (if B12 low) for autoimmune gastritis; anti-tissue transglutaminase IgA with total IgA for celiac disease; and consider FSH/LH or AMH for premature ovarian failure in appropriate patients.

## Clinical Guardrails / Mimics / Pitfalls
Do not screen if autoimmune origin definitively excluded; do not rely on symptoms alone to trigger screening; avoid unnecessary repeat testing within 12 months unless clinically indicated; remember that pregnancy may alter interpretation of thyroid and glucose tests; consider HLA-DQ2/DQ8 genotyping if serology equivocal for celiac.

## Concrete Clinical Example
A 34‑year‑old woman with PAI of uncertain autoimmune origin (21‑hydroxylase antibody not sent) presents for routine follow‑up. She has no autoimmune symptoms. Step 1 confirms PAI and unknown serology. Step 2 finds autoimmune origin not excluded. Step 3 classifies her for annual screening. Step 4 orders TSH, free T4, HbA1c, vitamin B12, anti‑tTG IgA, and anti‑parietal cell antibody; all return negative, and screening is repeated annually.

**Source:** Diagnosis and Treatment of Primary Adrenal Insufficiency: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2016, 10.1210/jc.2015-1710