Pre-instrumental variables in coagulation testing.

Abstract:

:A number of variables thought to affect measurement of prothrombin time (PT) and partial thromboplastin time (PTT) were examined in an effort to determine more precisely their effects on these measurements. On the basis of these studies, it is proposed that blood specimens be anticoagulated with one part 3.8% (w./v.) sodium citrate solution to 19 parts whole blood to avoid excessive anticoagulation of blood samples drawn from patients with polycythemia. Because of the smaller amount of plasma in such samples, relatively larger amounts of anticoagulant are used, and spuriously prolonged PT and PTT measurements commonly result. No deleterious effect on anemic specimens is evident when the smaller amount of citrate is used. Studies of the stability of these specimens indicate that unopened, vacuum-drawn specimens do not noticeably deteriorate for as long as 6 hours, even when kept at room temperature. Prothrombin time measurements remain constant for as long as 24 hours. However, a 10--15% lengthening of the partial thromboplastin time is evident after 24 hours of storage.

journal_name

Am J Clin Pathol

authors

Koepke JA,Rodgers JL,Ollivier MJ

doi

10.1093/ajcp/64.5.591

subject

Has Abstract

pub_date

1975-11-01 00:00:00

pages

591-6

issue

5

eissn

0002-9173

issn

1943-7722

journal_volume

64

pub_type

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