Covariance analysis of laboratory variance in steady-state serum phenytoin concentrations.

Abstract:

:Inpatients (n = 57) on long term prophylaxis with 2 oral phenytoin preparations were followed up via monthly checks of serum drug concentrations. Duplicate serum aliquots were submitted to 2 laboratories, and covariance analysis was used to estimate laboratory error. The laboratory-associated variance of examinations using the 'EMIT' or 'TDX' systems was 7.1 to 10 (mg/L)2, while that of chromatographic assays was 37.1 (mg/L)2. Laboratory errors were distributed in a non-normal fashion. The ratio of the maximum rate of metabolism (Vmax) and the Michaelis-Menten constant (Km) tended to remain constant between individuals. A linear analytical model showed little more residual variance than one based on Michaelis-Menten pharmacokinetics.

journal_name

Clin Pharmacokinet

authors

Costeff H,Groswasser Z,Soroker N,van Belle G

doi

10.2165/00003088-199120040-00007

subject

Has Abstract

pub_date

1991-04-01 00:00:00

pages

331-5

issue

4

eissn

0312-5963

issn

1179-1926

journal_volume

20

pub_type

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