Abstract Volume 24 p 366, Fig. 3: The serum concentration data plotted in Figure 3 are five times too high. The sentence starting the second paragraph on page 366 should read: "Intravenous administration of 1 g of cefuroxine to the human volunteer yielded a concentration of 86.6 mg/liter 15 mm after injection." p 481: The third sentence in the Results and Discussion section should read "... revealed LD-1 isoenzyme in fraction 3, predominant amounts of LD-2 isoenzyme in fraction 2, and LD isoenzymes 3, 4, and 5 in fraction 1." p 520: The authors (p 522) of the Letter on hyperphosphatemia should also include M. E. De Broe (Dept. of Nephrology, Clinical Chemistry, University Hospital Gent, B-9000 Gent, Belgium), P. De Cock, and J. Jacken (Dept. of Pediatrics, University Hospital Leuven, B-3000 Leuven, Belgium). p 730, column three: "4000 nmol/liter" and "20 nmol/liter" should read "4000 µmol/liter" and "20 µmol/liter." p. 806: Units in Tables 1 and 2 should be "µg/10 ml." In column two, second full paragraph, change the wording to read" ... regard 250 ng as the lower practical limit." p 1083: Fig. 1, sublegend: change the dimension of the retainer from 57 mm to 28.5 mm. The scale shown in the Figure should read 0-2.5 cm instead of 0-5 cm. p 1086, center column, third paragraph: for "222" read "0.222." p 1129: Footnote superscripts in the headings of Table 3 should be corrected to: (Column A) "Day-to-daya precision:SD from meand of duplicate differences" (Column B) "Overall long. termb precision: Mean SDe" (Column C) "Overallc bias" p 1304: Add the acknowledgment: "This work was supported in part by Biomedical Research Support Grant No. S07-RR-05593-10 to Good Samaritan Hospital Medical Center." p 1467: Change "4 to 6000" to read "4 to 5000."