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Previous Volume 353:842-844 August 25, 2005 Number 8 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Shlipak et al. (May 19 issue)¹ report on cystatin C and the risk of death and cardiovascular events among elderly persons. However, we have a comment on cystatin C as a measure of kidney function. In patients with hypothyroidism, levels of creatinine tend to be elevated, and in patients with hyperthyroidism, creatinine is lowered.² In contrast, levels of cystatin C are low in cases of hypothyroidism and elevated in hyperthyroidism.³ However, the authors state in the Discussion section that "cystatin C levels appear to be elevated in patients with hypothyroidism and depressed in those with hyperthyroidism," citing . . . [Full Text of this Article]

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