Automatic Recording of Prothrombin Times and Other Coagulation Tests in Multiple Samples

1966 ◽  
Vol 16 (01/02) ◽  
pp. 311-317
Author(s):  
J Margolis ◽  
J. S Jackson
Keyword(s):  
Prothrombin Time ◽  
Automatic Recording ◽  
Clotting Time ◽  
Coagulation Tests ◽  
Instrumental Recording ◽  
Kaolin Clotting Time ◽  
Transparent Windows ◽  
Multiple Samples

SummarySimultaneous coagulation tests on multiple samples are performed in parallel compartments of metal trays mounted on a heated rocking platform. Transparent windows and underlaying photo-resistive cells may be incorporated into the apparatus for instrumental recording of the results. The use of the system for the measurement of prothrombin time and kaolin clotting time is described.

Can RoTEM®analysis be applied for haemostatic monitoring in paediatric congenital heart surgery?

2011 ◽  
Vol 21 (6) ◽  
pp. 684-691 ◽  
Author(s):  
Jo Bønding Andreasen ◽  
Anne-Mette Hvas ◽  
Kirsten Christiansen ◽  
Hanne Berg Ravn
Keyword(s):  
Cardiac Surgery ◽  
Platelet Count ◽  
Prothrombin Time ◽  
Partial Thromboplastin Time ◽  
Congenital Heart ◽  
Heart Surgery ◽  
Congenital Heart Surgery ◽  
Activated Partial Thromboplastin Time ◽  
Clotting Time ◽  
Coagulation Tests

AbstractBackgroundSuccessful management of bleeding disorders after congenital heart surgery requires detection of specific coagulation disturbances. Whole-blood rotation thromboelastometry (RoTEM®) provides continuous qualitative haemostatic profiles, and the technique has shown promising results in adult cardiac surgery.SettingTo compare the performance of RoTEM®with that of conventional coagulation tests in children, we conducted a descriptive study in children undergoing congenital cardiac surgery. For that purpose, 60 children were enrolled and had blood samples taken before, immediately after, and 1 day after surgery. Conventional coagulation tests included: activated partial thromboplastin time, prothrombin time, fibrinogen, fibrin D-dimer, thrombin clotting time, factor XIII, and platelet count.ResultsPost-surgical haemostatic impairment was present to some degree in all children, as seen by pronounced changes in activated partial thromboplastin time, prothrombin time, thrombin clotting time, and platelet count, as well as RoTEM®analysis. RoTEM®showed marked changes in clotting time – prolonged by 7–18% – clot formation time – prolonged by 46–71% – maximum clot firmness – reduced by 10–19%, and maximum velocity – reduced by 29–39%. Comparison of the two techniques showed that conventional coagulation tests and RoTEM®performed equally well with regard to negative predictive values for excessive post-operative drain production – more than 20 millilitres per kilogram per 24 hours after surgery – with an area under the curve of approximately 0.65.ConclusionRoTEM®can detect haemostatic impairments in children undergoing cardiac surgery and the method should be considered as a supplement in the perioperative care of the children where targeted transfusion therapy is necessary to avoid volume overload.

scholarly journals Some normal value of coagulation tests, proteins concentration tests, iron concentration and copper concentration tests of local house cats in Baghdad city

2012 ◽  
Vol 36 (0A) ◽  
pp. 86-91
Author(s):  
Saleem Amin Hasso
Keyword(s):  
Prothrombin Time ◽  
Protein Concentration ◽  
Copper Concentration ◽  
Iron Concentration ◽  
Fibrinogen Concentration ◽  
Clotting Time ◽  
Total Protein Concentration ◽  
Blood Samples ◽  
Male And Female ◽  
Coagulation Tests

Forty seven blood samples were collected from local house cats 25 male , 22 female , ranging in age from 1-15 year for both sexes for measuring the following parameters coagulation tests (total Platelets count, Clotting time, Prothrombin Time & Fibrinogen concentration ) and proteins concentration tests (Total protein concentration, Albumin , Globulin concentration ) and iron and copper concentration tests .the results as were follow (228.5 –1,537) X 109\L , (2-5)min , (6 - 15) sec , (0.5 -4) g\L , ( 61 - 83 ) g\L , (23.1 -38.2) g\L , (25.9-54.2) g\L , (5.21 – 45.56) μmol/L , (2.29 - 36.52) μmol/L) .the result showed significant differences at level (P<0.05) between the male and female of local house cats in total Platelets count and Prothrombin Time . Other studied parameters showed no significant differences at level (P<0.05) between the male and female in local house cats.

Detection and Quantitative Evaluation of Lupus Circulating Anticoagulant Activity

1987 ◽  
Vol 57 (02) ◽  
pp. 144-147 ◽  
Author(s):  
Esther Rosner ◽  
Rachel Pauzner ◽  
Ayala Lusky ◽  
Michaela Modan ◽  
Amira Many
Keyword(s):  
Quantitative Evaluation ◽  
Anticoagulant Activity ◽  
Clotting Time ◽  
False Negatives ◽  
Coagulation Tests ◽  
Recurrent Abortions ◽  
Tissue Thromboplastin ◽  
Kaolin Clotting Time ◽  
Recalcification Time ◽  
Numerical Index

SummarySixty-six SLE patients were studied for the presence of lupus type circulating anticoagulant. Forty-nine percent of them showed activity of this anticoagulant. The sensitivity of various coagulation tests was compared. Recalcification time was found to be the most sensitive screening test and the kaolin clotting time mixture test, the best for determining the presence of the anticoagulant.Tissue thromboplastin inhibition test detected only half of the patients in whom the anticoagulant was found by recalcification time and kaolin clotting time mixture test.APTT, using 2 different reagents, resulted in 73% and 52% false negatives. A numerical index for determining the presence of the anticoagulant and its quantitative evaluation is suggested.The association between thromboembolic events, recurrent abortions and the different coagulation tests is shown.

Detection of Lupus-Like Anticoagulants by an Enzyme-Linked Immunosorbent Assay Using a Partial Thromboplastin as Antigen; A Comparative Study

1990 ◽  
Vol 64 (01) ◽  
pp. 026-031 ◽  
Author(s):  
J Arnout ◽  
E Huybrechts ◽  
M Vanrusselt ◽  
C Falcon ◽  
J Vermylen
Keyword(s):  
Antiphospholipid Antibodies ◽  
Lupus Anticoagulant ◽  
Activated Partial Thromboplastin Time ◽  
The Other ◽  
Quantitative Detection ◽  
Enzyme Linked Immunosorbent Assay ◽  
Clotting Time ◽  
Coagulation Tests ◽  
Tissue Thromboplastin ◽  
Kaolin Clotting Time

SummaryClotting assays allow qualitative rather than quantitative detection of the lupus anticoagulant. We have therefore studied the usefulness of an ELISA using a commercial partial thromboplastin, Thrombofax, oS antigen; the results obtained on 146 selected patient plasmas were compared to the results of coagulation tests (kaolin clotting time, tissue thromboplastin inhibition test, activated partial thromboplastin time) and of ELISAs using cardiolipin or phosphatidylserine as antigen. While satisfactory agreement was found within the group of coagulation tests or that of ELISAs, only a moderate agreement was obtained between clotting tests and ELISAs, the best being with the partial thromboplastin ELISA using low plasma dilutions. The study further indicates that ELISA techniques cannot entirely replace coagulation tests for the detection of a lupus anticoagulant, even when a partial thromboplastin is used as antigen. On the other hand, coagulation tests are less sensitive than ELISAs for the detection of antiphospholipid antibodies.

Relative Sensitivity of Different Tests in the Detection of Low Titer Lupus Anticoagulants

1988 ◽  
Vol 60 (02) ◽  
pp. 217-219 ◽  
Author(s):  
B Lesperance ◽  
M David ◽  
J Rauch ◽  
C Infante-Rivard ◽  
G E Rivard
Keyword(s):  
Relative Sensitivity ◽  
Fetal Outcome ◽  
Anticardiolipin Antibodies ◽  
Lupus Anticoagulants ◽  
Normal Plasma ◽  
Coagulation Tests ◽  
High Dilutions ◽  
Tissue Thromboplastin ◽  
High Concentrations ◽  
Kaolin Clotting Time

SummaryLupus anticoagulants (LA) and anticardiolipin antibodies have been strongly associated with recurrent abortion and fetal death. Because steroids have been reported to improve the fetal outcome of LA associated pregnancies, presumably by decreasing the levels of LA, it becomes desirable to have a simple and reliable test to monitor the levels of the putative antibody. To this effect, we assessed the capacity of the following coagulation tests to detect the presence of LA in serial dilutions of patient plasma with pooled normal plasma: kaolin clotting time (KCT), tissue thromboplastin inhibition test (TTIT), dilute Russell Viper venom time (DRVVT) and activated partial thromboplastin time with standard and high concentrations of phospholipids (SC and HCAPTT). All samples were also evaluated for the presence of anticardiolipin antibodies with an ELISA. The KCT was able to detect LA at a much greater dilution in normal plasma than any of the other clotting assays. The ELISA was comparable to KCT in its ability to detect high dilutions of LA.

Scientific and Standardization Committee Communications Comparison of Test Methods for the Lupus Anticoagulant: International Survey on Lupus Anticoagulants-I (ISLA-1)

1990 ◽  
Vol 64 (03) ◽  
pp. 478-484 ◽  
Author(s):  
Thomas Exner ◽  
Douglas A Triplett ◽  
David A Taberner ◽  
Margaret A Howard ◽  
E Nigel Harris
Keyword(s):  
Lupus Anticoagulant ◽  
Test Methods ◽  
Positive Sample ◽  
Direct Proportion ◽  
Clotting Time ◽  
Preliminary Screening ◽  
Activated Platelets ◽  
Tissue Thromboplastin ◽  
Kaolin Clotting Time ◽  
Induced Defects

SummarySix lyophilized plasma samples were sent to 20 “expert” laboratories for assessment of lupus anticoagulant (LA). Four samples contained pooled LA of graded potency mixed with aged normal plasma. One contained LA plus cephalin phospholipid and one contained a nonspecific venom anticoagulant. Sixteen methods were used overall with some participants using up to 8 methods. Results were scored in regard to the known potencies of LA in the samples and other known induced defects.Activated partial thromboplastin time (APTT) tests used by most participants for preliminary screening were relatively sensitive, but non-specific. Platelet or phospholipid neutralization procedures (PNP) appeared to be sensitive and specific but showed a non-linear response to increased LA content. Kaolin clotting time (KCT) tests showed the most sensitive response to increased LA content but the weaker LA were not scored as abnormal by most laboratories as the samples may have contained platelet fragments. Other commonly used tests such as the tissue thromboplastin inhibition (TTI) test and the dilute Russell’s viper venom test (DRVVT) were carried out somewhat inconsistently. The variability in performance of tests in different laboratories indicates that standardization of methodology is urgently required.Generally it seemed that most clotting tests were “bypassed” by the addition of phospholipid to a known LA-positive sample in apparently direct proportion to their sensitivity. Sample preparation, especially prevention of contamination with activated platelets is a vital preliminary part in the assay of LA.

Rapid Screening Methods for Bleeding Disorders. A Three Year Survey

1964 ◽  
Vol 11 (02) ◽  
pp. 506-512 ◽  
Author(s):  
V. A Lovric ◽  
J Margolis
Keyword(s):  
Laboratory Tests ◽  
Capillary Blood ◽  
Screening Tests ◽  
Rapid Screening ◽  
Screening Methods ◽  
Bleeding Disorders ◽  
Routine Laboratory ◽  
Clotting Time ◽  
Kaolin Clotting Time ◽  
In Infants And Children

SummaryAn adaptation of “kaolin clotting time” and prothrombin time for use on haemolysed capillary blood provided simple and sensitive screening tests suitable for use in infants and children. A survey of three year’s experience shows that these are reliable routine laboratory tests for detection of latent coagulation disorders.

THE EFFECT OF EARLY BLOOD TRANSFUSION ON THE OUTCOME OF GASTROINTESTINAL HAEMORRHAGE

1987 ◽  
Author(s):  
S D Blair ◽  
S B Javanvrin ◽  
C N McCollum ◽  
R M Greenhalgh
Keyword(s):  
Blood Transfusion ◽  
Blood Coagulation ◽  
Whole Blood ◽  
Randomised Trial ◽  
Gastrointestinal Haemorrhage ◽  
Clotting Time ◽  
Prospective Randomised Trial ◽  
Coagulation Tests ◽  
To Receive ◽  
Upper Gastrointestinal

It has been suggested that mortality due to upper gastrointestinal haemorrhage may be reduced by restricting blood transfusion [1], We have assessed whether this is due to an anticoagulant effect in a prospective randomised trial.One hundred patients with severe, acute gastrointestinal haemorrhage were randomised to receive either at least 2 units of blood during the first 24 hours of admission, or no blood unless their haemaglobin was lessthan 8g/dl or they were shocked. Minor bleeds and varices were excluded As hypercoagulation cannot be measured using conventional coagulation tests, fresh whole blood coagulation was measured by the Biobridge Impedance Clotting Time (ICT). Coagulation was assessed at 24 hour intervals and compared to age matched controls with the results expressed as mean ± sem.The ICT on admission for the transfusion group (n=50) was 3.2±0.2 mins compared to 10±0.2 mins in controls. This hyper-coagulable state was partially reversed to 6.4±0.3 mins at 24 hours (p<0.001). The 50 allocated to receive no blood had a similar ICT on admission of 4.4±0.4 mins but the hypercoagulable state was maintained with ICT at 24 hours of 4.320.4 mins. Only 2 patients not transfused rebled compared to 15 in the early transfusion group (p<0.001). Five patients died, and they were all in the early transfusion group.These findings show there is a hypercoagulable response to haemorrhage which is partially reversed by blood transfusion leading to rebleeding

dRVVT Is more Sensitive than KCT or TTI for Detecting Lupus Anticoagulant Activity of Anti-β2-glycoprotein I Autoantibodies

1999 ◽  
Vol 81 (02) ◽  
pp. 256-258 ◽  
Author(s):  
A. Biasiolo ◽  
P. Rampazzo ◽  
T. Brocco ◽  
V. Pengo
Keyword(s):  
Lupus Anticoagulant ◽  
Anticoagulant Activity ◽  
Test System ◽  
Clotting Time ◽  
Lupus Anticoagulants ◽  
Glycoprotein I ◽  
Tissue Thromboplastin ◽  
The Mean ◽  
Kaolin Clotting Time ◽  
Antibody Preparations

SummaryAnti-β2-glycoprotein I (β2-GPI) antibodies behave as classical Lupus Anticoagulants (LA), as they inhibit phospholipid-dependent coagulation reactions and their activity disappears in the presence of excess exogenous phospholipids (PLs). We have recently shown that a certain amount of PLs in the dilute Russell Viper Venom Time (dRVVT) test system is required to express LA activity of anti β2-GPI antibodies. We have now extended this observation to two other tests, i.e., Kaolin Clotting Time (KCT) in which PLs are not added, and Tissue Thromboplastin Inhibition test (TTI) in which PLs are extremely diluted. In fact, affinity-purified antibody preparations from 5 patients with antiphospholipid syndrome did not express or only weakly expressed anticoagulant activity in both tests; the mean ratios of coagulation times obtained with purified antibodies and that of control buffer were 1.11 and 1.0 for KCT and TTI, respectively. On the contrary, the mean ratios in dRVVT were 1.31 and 1.49 at a PLs dilution of 1:8 and 1:64, respectively. Therefore, the presence of LA activity due to autoantibodies to β2-GPI is characterized by a positive dRVVT and negative or only weakly positive KCT and TTI.

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