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Thromb Haemost 1973; 29(02): 228-239
DOI: 10.1055/s-0038-1647766
Original Article
Schattauer GmbH

Calibration of Five Different Thromboplastins, Using Fresh and Freeze-dried Plasma

D. R Bangham
1   Division of Biological Standards, National Institute for Medical Research, London, NW7 1AA, and the Haemophilia Centre, Medical Research Council Laboratory, Churchill Hospital, Oxford, England
,
R Biggs
1   Division of Biological Standards, National Institute for Medical Research, London, NW7 1AA, and the Haemophilia Centre, Medical Research Council Laboratory, Churchill Hospital, Oxford, England
,
M Brozović
1   Division of Biological Standards, National Institute for Medical Research, London, NW7 1AA, and the Haemophilia Centre, Medical Research Council Laboratory, Churchill Hospital, Oxford, England
,
K. W. E Denson
1   Division of Biological Standards, National Institute for Medical Research, London, NW7 1AA, and the Haemophilia Centre, Medical Research Council Laboratory, Churchill Hospital, Oxford, England
› Author Affiliations
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Publication History

Received for publication 25 May 1972

Publication Date:
30 June 2018 (online)

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Summary

The results of this trial confirmed that the five different thromboplastin preparations could be calibrated in terms of thromboplastin 67/40 (2) in respect to their sensitivity to coumarin induced defect.

Using thromboplastin 2 (67/40) as reference and assigning to it, by definition, a TSR of 2.0, the other four thromboplastins can be assigned the following TSRs: thromboplastin 1 (69/223) 1.9: thromboplastin 3 (68/434) 2.0; thromboplastin 4 (70/115)2.0; and thromboplastin 5 (70/178) 1.5.

In view of the great amount of collaborative work which has been invested in the study of these preparations, they should be kept primarily for the purposes of calibrating other reference preparations rather than be consumed as working standards. Thromboplastin 67/40 should be preserved for calibrating future batches of an international reference material or of national reference preparations of a similar type. The other four preparations could be used to calibrate similar types of thromboplastin: human brain without added bovine factors (69/223) for calibration of similar human thromboplastins; the bovine thromboplastin (68/434) for bovine preparations, and the two different rabbit brain preparations (70/115) and (70/178) for calibration of the rabbit brain reagents. In this manner each of the preparations would be compared to a material of the same species and similar type, and the stocks of these materials conserved to last over a longer period of time.

Carefully prepared freeze-dried pooled plasma from patients on oral anticoagulants can be used instead of a large number of individual fresh plasmas to simplify the calibration procedure of selected thromboplastins.

In the present state of knowledge about the coumarin induced coagulation defect, artificially prepared abnormal plasmas appear to have little use in the calibration of thromboplastin preparations for control of anticoagulant therapy.

 

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