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Phenytoin Concentrations in Venous versus Capillary Blood of Geriatric Patients
Author(s) -
Umstead Greg S.,
McKernan Thomas
Publication year - 1981
Publication title -
journal of the american geriatrics society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.992
H-Index - 232
eISSN - 1532-5415
pISSN - 0002-8614
DOI - 10.1111/j.1532-5415.1981.tb02391.x
Subject(s) - medicine , phenytoin , venous blood , intensive care medicine , anesthesia , epilepsy , psychiatry
In 15 elderly patients who had seizure disorders, venous blood (standard venipuncture) was compared with capillary blood (finger lancet puncture) as the source of the specimen for determination of serum phenytoin concentration. The values obtained by the two procedures were similar (r = 0.99). The mean serum phenytoin levels in the venous samples was 17.3 μg/ml, and in the capillary samples 17.0 μg/ml; the paired t test showed no statistical difference. Either method provides an adequate blood sample for determination of phenytoin, and both may be used interchangeably. Capillary samples may be preferable for aged patients in whom venipuncture proves difficult or painful.