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Clinical Chemistry 39: 592-599, 1993;
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Clinical Chemistry, Vol 39, 592-599, Copyright © 1993 by American Association for Clinical Chemistry

Carnitine measurements in liver, muscle tissue, and blood in normal subjects

P Harper, C Wadstrom and G Cederblad
Department of Clinical Chemistry, Karolinska Institute, Danderyd Hospital, Sweden.

We determined carnitine concentrations in blood and in liver and abdominal muscle biopsy specimens in 13 men and 16 women undergoing elective surgery (mostly gallbladder removal). The data suggest that the carnitine pools of plasma and erythrocytes are different. The erythrocytes show a higher acylcarnitine concentration than does plasma (P < 0.001). Several reference bases for values in tissues have been used--dry weight, noncollagen protein (NCP), and DNA--because these may be differently influenced by disease. In liver specimens, the quotient NCP (g)/DNA (g) was significantly higher in men, 54.4 +/- 6.3 (mean +/- SD), than in women, 47.7 +/- 7.0 (P < 0.01). Liver total carnitine content in relation to DNA was significantly higher in men than in women: 0.29 +/- 0.06 vs 0.22 +/- 0.08 mmol/g DNA (P < 0.01). Free carnitine content was significantly higher in men than in women independently of the reference base, e.g., 3.7 +/- 1.0 mumol/g NCP for men vs 2.9 +/- 1.0 for women (P < 0.05). No difference was found between the sexes in the abdominal muscle carnitine content, 20.6 +/- 6.7 mumol/g NCP for men vs 17.9 +/- 5.0 for women. Our study establishes control ranges, thereby providing an important basis for studies of patients with abnormal carnitine metabolism.


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