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Pepsinogens and other serum markers in pernicious anemia
1Department of Medicine, Los Angeles County-USC Medical Center, California 90033.
Abstract:
Pepsinogen (PG) I and PG II levels were determined in sera from 147 patients with pernicious anemia. Race, sex, age, gastrin level, and antibody status did not influence pepsinogen levels. PG I values less than 30 micrograms/L were found in 92% of cases and PG I to PG II ratios less than 3.0 in 82% of cases. At least one of these two results was abnormal in 97% of all patients with pernicious anemia. In comparison, results of other blood tests used in the investigation of pernicious anemia were less often abnormal. Serum gastrin level exceeded 200 ng/L in 90% of patients with pernicious anemia and was second to pepsinogen abnormality in diagnostic sensitivity. Results for anti-intrinsic factor antibody were positive in 73% of cases and anti-parietal cell antibody in only 52%. Although its specificity is limited, the presence of low PG I level and/or low PG I-PG II ratio is currently the most sensitive serum indicator for pernicious anemia, and absence of both can be taken as a strong argument against the diagnosis. This highly sensitive test can be combined further with the highly specific serum anti-intrinsic factor antibody test for the presumptive diagnosis of pernicious anemia when definitive tests (the Schilling test or gastric analysis for intrinsic factor) cannot be done or results are inconclusive.
Insights
Low levels of pepsinogen (PG) I and PG I to PG II ratios are highly sensitive indicators for diagnosing pernicious anemia. These blood tests are more effective than other common diagnostic markers for pernicious anemia.
Area of Science:
- Gastroenterology
- Clinical Chemistry
- Immunology
Background:
- Pernicious anemia is an autoimmune condition affecting the stomach lining.
- Accurate diagnosis relies on identifying specific biomarkers.
- Existing diagnostic methods can be invasive or inconclusive.
Purpose of the Study:
- To evaluate the diagnostic sensitivity of serum pepsinogen (PG) levels in pernicious anemia.
- To compare the effectiveness of PG I and PG II levels with other diagnostic markers.
- To establish PG levels as a reliable indicator for pernicious anemia diagnosis.
Main Methods:
- Serum samples from 147 pernicious anemia patients were analyzed for PG I and PG II levels.
- Pepsinogen levels were correlated with clinical factors like race, sex, age, gastrin levels, and antibody status.
- Diagnostic sensitivity of PG levels was compared to serum gastrin and antibody tests.
Main Results:
- 92% of patients had low PG I levels (<30 µg/L).
- 82% had low PG I to PG II ratios (<3.0).
- 97% of patients showed at least one abnormal PG result, surpassing other tested markers in sensitivity.
Conclusions:
- Low PG I and/or low PG I-PG II ratio are the most sensitive serum indicators for pernicious anemia.
- Absence of these abnormal PG findings strongly argues against the diagnosis.
- Combining PG tests with anti-intrinsic factor antibody tests offers a highly sensitive and specific presumptive diagnosis.
