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A comparison of different methods for diagnosing acromegaly
B Stoffel-Wagner1, W Springer, F Bidlingmaier
1Department of Clinical Biochemistry, University of Bonn, Germany.
Clinical Endocrinology
|May 1, 1997
Summary
The oral glucose tolerance test (OGTT) is the only definitive method to diagnose active acromegaly. While IGF-I and other markers aid diagnosis, they are less reliable for monitoring treatment effectiveness.
Area of Science:
- Endocrinology
- Diagnostic Medicine
Background:
- Acromegaly diagnosis traditionally relies on the oral glucose tolerance test (OGTT).
- Alternative diagnostic markers are being explored for efficiency and accuracy.
Purpose of the Study:
- To evaluate the diagnostic utility of single measurements compared to OGTT for acromegaly.
- To assess the value of IGF-I, free IGF-I, 24-hour urinary GH (uGH), and IGFBP-3 in acromegaly diagnosis and follow-up.
Main Methods:
- Measurements included IGF-I, free IGF-I, uGH, IGFBP-3, and 24-hour urinary IGFBP-3 (uIGFBP-3).
- These were analyzed in untreated active acromegaly, treated but uncured acromegaly, cured acromegaly, and healthy control groups.
- Results were compared against the standard OGTT.
Main Results:
- Nadir GH in OGTT distinguished active acromegaly from cured patients and controls.
- IGF-I, free IGF-I, uGH, and IGFBP-3 were elevated in active acromegaly but showed overlap in treated/uncured patients.
- Only IGF-I did not overlap with the control group; uIGFBP-3 was not a useful diagnostic marker.
Conclusions:
- OGTT remains the gold standard for distinguishing active acromegaly.
- IGF-I, free IGF-I, IGFBP-3, and uGH are useful for diagnosis but limited for post-treatment monitoring.
- Free IGF-I determination offers no advantage over total IGF-I or IGFBP-3.