Marcus A. Krupp, MD
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To the Editor: The transition to SI units for reporting clinical chemistry results has been difficult enough for the reader accustomed to the old method. It becomes more difficult, therefore, to identify errors in reports. The article by Lang and colleagues (1) on the effects of blood-ionized calcium (should be plasma-ionized calcium) contains an error in reporting total calcium. In Table 1, the values for calcium (that is, total calcium) are 7.2, 10.5, and 12.3 mmol/L. If indeed the unit millimoles per litre was meant, then the total calcium levels become 28.8, 42.0, and 49.2 mg/dL, respectively. Surely, the authors
Krupp MA. Correction: Left Ventricular Contractility and Blood-Ionized Calcium. Ann Intern Med. ;109:600. doi: 10.7326/0003-4819-109-7-600_2
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Published: Ann Intern Med. 1988;109(7):600.
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