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Clinical Chemistry 32: 523-526, 1986;
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Clinical Chemistry, Vol 32, 523-526, Copyright © 1986 by American Association for Clinical Chemistry

Monoject Samplette capillary blood container with serum separator evaluated for collection of specimens for therapeutic drug assays and common clinical-chemical tests

M Landt, LL Norling, M Steelman and CH Smith

The Monoject Samplette (Sherwood) capillary serum-separator tube was evaluated for use in pediatric capillary blood collection. When patients' values for eight common clinical-chemical tests and five therapeutic drugs were compared with values from specimens concomitantly collected in plain Caraway tubes, only chloride and total CO2 were significantly different. The chloride differences (range 0-2 mmol/L) were considered to be clinically insignificant. Higher CO2 values in Samplette specimens were apparently ascribable to decreased loss to the atmosphere. Samplette values for therapeutic drugs were higher than corresponding Caraway values, but only the differences for digoxin were judged to be clinically significant. Both recoverable serum and the incidence of hemolysis were lower in Samplette specimens than in Caraway specimens. Storage of serum over the clots (with separator material interposed) in Samplettes for 24 h had no clinically significant effect on results for glucose or potassium. Storage of specimens for as long as 24 h had no effect on theophylline, phenytoin, and gentamicin concentrations, but phenobarbital reproducibly decreased after 24 h. We conclude that the Samplette serum-separator tube is suitable for the collection of capillary blood for many of the chemical tests commonly ordered for pediatric patients.


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Copyright © 1986 by the American Association for Clinical Chemistry.