Abstract
The results compare well with the Autoanalyzer method (r = 0.996 and 0.988 for plasma and urine) and regression analysis shows that they are 10 % lower; this may be due to higher specificity. Frequency values were obtained in a population study. These were for 106 men : 5.4 - 11.3 mg/1 and for 73 women : 3.9 - 10.6 mg/1; sex difference is significant with p < 0.001.

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