Prevalence of Celiac Disease in Patients With Iron Deficiency Anemia-A Systematic Review With Meta-analysis
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Srihari Mahadev1, Monika Laszkowska1, Johan Sundström2
1Celiac Disease Center, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York.
Insights
Approximately 1 in 31 individuals with iron-deficiency anemia (IDA) have celiac disease (CD). This systematic review confirms that screening IDA patients for CD is warranted, supporting current clinical guidelines.
Area of Science:
- Gastroenterology
- Internal Medicine
- Clinical Diagnostics
Background:
- Anemia, particularly iron-deficiency anemia (IDA), is frequently observed in patients with celiac disease (CD).
- Current medical guidelines advocate for screening individuals with IDA for CD.
- The precise prevalence of CD among IDA patients remains variable in existing literature.
Purpose of the Study:
- To conduct a systematic review and meta-analysis to determine the prevalence of biopsy-verified celiac disease (CD) in patients presenting with iron-deficiency anemia (IDA).
Main Methods:
- A systematic literature search was performed using PubMed Medline and EMBASE databases up to July 2017.
- Studies were identified using keywords "celiac disease" combined with "anemia" or "iron deficiency."
- Fixed-effects inverse variance-weighted models were employed to calculate the pooled prevalence of CD, with meta-regression used to analyze heterogeneity.
Main Results:
- The analysis included 18 studies encompassing 2998 patients with IDA, with CD prevalence identified in 4.8% (unweighted) and 3.2% (weighted pooled analysis).
- High heterogeneity (I² = 67.7%) was noted, but subgroup analyses and meta-regression did not reveal significant associations with age, sex, or publication year.
- In 8 high-quality studies, the pooled prevalence of biopsy-confirmed CD was 5.5% (95% CI = 4.1-6.9).
Conclusions:
- This systematic review and meta-analysis indicates that approximately 1 in 31 patients with IDA have biopsy-confirmed celiac disease.
- The findings support the established clinical practice of screening patients with iron-deficiency anemia for celiac disease.
Background & Aims:
Anemia is common in patients with celiac disease (CD) and a frequent mode of presentation. Guidelines recommend screening patients with iron-deficiency anemia (IDA) for CD. However, the reported prevalence of CD in patients with IDA varies. We performed a systematic review to determine the prevalence of biopsy-verified CD in patients with IDA.
Methods:
We performed a systematic review of articles published in PubMed Medline or EMBASE through July 2017 for the term "celiac disease" combined with "anemia" or "iron deficiency." We used fixed-effects inverse variance-weighted models to measure the pooled prevalence of CD. Meta-regression was used to assess subgroup heterogeneity.
Results:
We identified 18 studies composed of 2998 patients with IDA for inclusion in our analysis. Studies originated from the United Kingdom, United States, Italy, Turkey, Iran, and Israel. The crude unweighted prevalence of CD was 4.8% (n = 143). Using a weighted pooled analysis, we found a prevalence of biopsy-confirmed CD of 3.2% (95% confidence interval = 2.6-3.9) in patients with IDA. However, heterogeneity was high (I2 = 67.7%). The prevalence of CD was not significantly higher in studies with a mean participant age older or younger than 18 years or in studies with a mixed-sex vs female-predominant (≥60%) population. On meta-regression, year of publication, female proportion, age at CD testing, and prevalence in the general population were not associated with the prevalence of CD in patients with IDA. In the 8 studies fulfilling all our quality criteria, the pooled prevalence of CD was 5.5% (95% confidence interval = 4.1-6.9).
Conclusions:
In a systematic review and meta-analysis, we found that approximately 1 in 31 patients with IDA have histologic evidence of CD. This prevalence value justifies the practice of testing patients with IDA for CD.
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