The Minimum discard volume: Accurate analysis of peripheral hematocrit

Document Type

Article

Publication Date

1996

Publication Title

Journal of Intravenous Nursing

Volume

3

Issue

19

First page number:

141

Last page number:

146

Abstract

The purpose of this research is to quantify the minimum amount of blood that must be discarded from an indwelling peripheral intravenous catheter (deadspace 0.5 ml) to obtain an accurate hematocrit reading. Repeat blood sampling from nine subjects is used to develop a mathematical model (Michaelis-Menten curve) describing the mixing of the flush solution and the blood. This model is used to estimate the hematocrit when different volumes are discarded. Differences between the computed hematocrit and true hematocrit were determined for each subject. When 1.5 ml (three times the deadspace volume) is discarded, the 95% confidence interval is within 0.6% of the true hematocrit.

Keywords

Blood — Analysis; Hematocrit – Measurement; Intravenous therapy; Phlebotomy – Research

Disciplines

Hematology | Nursing

Language

English

Permissions

Use Find in Your Library, contact the author, or use interlibrary loan to garner a copy of the article. Publisher copyright policy allows author to archive post-print (author’s final manuscript). When post-print is available or publisher policy changes, the article will be deposited


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