Donald E. McMillan, MD; John I. Malone, MD
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To the Editors: Ernst (1) raised an important point about plasma fibrinogen measurement, a test used in cardiovascular risk factor assessment (2). In agreement with a past report (3), he compared fibrinogen measurements from several sources to indicate that fibrinogen values can be affected by geographic and climatic considerations. We have recently made observations in type I diabetes that bear directly on his conclusion. They have been used to test whether geographic or climatic factors, or both, actually influence fibrinogen level. Our observations suggest that the geographic-climatic problem he raises is not a large one; measurement differences between laboratories and
McMillan DE, Malone JI. Regional Variations in Plasma Fibrinogen. Ann Intern Med. 1992;116:521–522. doi: 10.7326/0003-4819-116-6-521
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Published: Ann Intern Med. 1992;116(6):521-522.
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