Measurement of prothrombin time and activated partial thromboplastin time in citrated whole blood samples from clinically ill dogs following storage

2012 ◽  
Vol 53 (9) ◽  
pp. 531-535 ◽  
Author(s):  
C. L. Maunder ◽  
M. Costa ◽  
S. M. Cue ◽  
E. M. Crawford ◽  
K. Papasouliotis ◽  
...  
2007 ◽  
Vol 131 (2) ◽  
pp. 293-296
Author(s):  
Alexander Kratz ◽  
Raneem O. Salem ◽  
Elizabeth M. Van Cott

Abstract Context.—Technologic advances affecting analyzers used in clinical laboratories have changed the methods used to obtain many laboratory measurements, and many novel parameters are now available. The effects of specimen transport through a pneumatic tube system on laboratory results obtained with such modern instruments are unclear. Objective.—To determine the effects of sample transport through a pneumatic tube system on routine and novel hematology and coagulation parameters obtained on state-of-the-art analyzers. Design.—Paired blood samples from 33 healthy volunteers were either hand delivered to the clinical laboratory or transported through a pneumatic tube system. Results.—No statistically significant differences were observed for routine complete blood cell count and white cell differential parameters or markers of platelet activation, such as the mean platelet component, or of red cell fragmentation. When 2 donors who reported aspirin intake were excluded from the analysis, there was a statistically, but not clinically, significant impact of transport through the pneumatic tube system on the mean platelet component. There were no statistically significant differences for prothrombin time, activated partial thromboplastin time, waveform slopes for prothrombin time or activated partial thromboplastin time, fibrinogen, or fibrin monomers. Conclusions.—Although further study regarding the mean platelet component may be required, transport through a pneumatic tube system has no clinically significant effect on hematology and coagulation results obtained with certain modern instruments in blood samples from healthy volunteers.


1993 ◽  
Vol 2 (1) ◽  
pp. 88-95 ◽  
Author(s):  
K Templin ◽  
M Shively ◽  
J Riley

OBJECTIVE: To determine the accuracy of activated partial thromboplastin time and prothrombin time studies when samples are drawn through heparinized arterial lines. METHODS: A total sample of 90 grouped blood samples (from 30 subjects) was used. Patients were all male, with a mean age of 65 and were studied within 24 hours of percutaneous transluminal coronary angioplasty. Each patient had three venous control and arterial line sample sets (a total of 90 blood samples) drawn when routinely ordered for monitoring therapy. For the arterial line sample, a discard volume of the deadspace, deadspace + 2 mL, or deadspace + 4 mL was randomly assigned for each sample. The venous control volumes were the same for all three sample sets. RESULTS: A 2 x 3 repeated measures analysis of variance was used to analyze the results. The independent variables were the source of the sample (venous vs arterial) and the discard volume of arterial blood (deadspace, deadspace + 2 mL, deadspace + 4 mL). The dependent variables were the activated partial thromboplastin time and prothrombin time values. Mean arterial activated partial thromboplastin time values were significantly higher than the corresponding venous values. Mean activated partial thromboplastin time values were not significantly different among the discard volumes of blood drawn. However, there was a significant source by volume interaction. Tukey post-hoc comparisons of venous-arterial activated partial thromboplastin time differences among the three volumes showed significant differences between deadspace volume and deadspace + 2 mL, and deadspace volume and deadspace + 4 mL. There was no significant difference between deadspace + 2 mL and deadspace + 4 mL volumes. CONCLUSION: Results indicated that the minimal amount of discard volume for accurate activated partial thromboplastin time values in this population of percutaneous transluminal coronary angioplasty patients was the catheter deadspace volume plus 2 mL (total 3.6 mL).


Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 5248-5248
Author(s):  
Bhaumik Arvindkumar Shah ◽  
Arulselvi Subramanium ◽  
Subhadra Sharma ◽  
Deepak Agrawal ◽  
Gaurav Chhabra ◽  
...  

Abstract Abstract 5248 In India trauma related deaths occur every 1.9 minutes. Mortality in severe traumatic injury (ISS>16) is six times higher in developing country like India. Coagulopathy is observed in almost 25– 30% of trauma patients which itself is an independent risk factor for haemorrhage. Coagulopathy detected early after injury is indicative of injury severity and itself is a prognostic factor for mortality. Aim To find out the usefulness of thromboelastography (TEG) in detecting coagulopathy in contrast to conventional methods of plasma based standard coagulation parameters (PT, aPTT, TT, fibrinogen, D-dimer) Objective To detect coagulopathy early by TEG in trauma patients within 24 hrs after injury which can be useful to guide haemostatic therapies to reduce mortality. Materials and methods Patients admitted to trauma casualty were studied within 24 hrs after injury. Native whole blood was withdrawn through venepuncture appropriately in syringe using 21G needle and TEG was performed within 2 mins. Blood was also collected in citrated tube to assess standard coagulation parameters (prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen, D-dimer) and also by means of thromboelastography. Results Patients (n=87,New ISS-24.78(mean)) admitted to J.P.N Apex trauma centre casualty from 1st April,2011 to 31st July,2011 were studied. The cases included in the study were isolated head injury (n=40, NISS-25.87(mean)), multiple trauma with head injury (n=13,NISS – 30.69 (mean)) and trauma other than head injury (n=34, NISS-21.24 (mean)).Thromboelastography was performed using whole blood (n=69) and citrated blood (n=18). Coagulation tests were performed on all 87 patients using both TEG and conventional coagulation parameters. Total 52 patients showed coagulopathy by TEG and only 14 patients showed coagulopathy by standard coagulation parameters (prothrombin time, activated partial thromboplastin time). Only in 10 cases coagulopathy was detected by both methods. 4 patients showed coagulopathy only by conventional methods while 42 patients showed coagulopathy by only Thromboelastography (TEG). To find out whether there is any stastistical significance in the observed apparently better result by TEG, McNemar Test was carried out and P value was <0.0001. Conclusion Thromboelastography could be a better technique as compared to conventional measurements of PT, aPTT, TT, Fibrinogen, D-dimer in early detection of coagulopathy in trauma patients. Disclosures: No relevant conflicts of interest to declare.


2010 ◽  
Vol 82 (2) ◽  
pp. 658-663 ◽  
Author(s):  
Lothar Müller ◽  
Stefan Sinn ◽  
Hartmut Drechsel ◽  
Christiane Ziegler ◽  
Hans-Peter Wendel ◽  
...  

2002 ◽  
Vol 88 (12) ◽  
pp. 992-995 ◽  
Author(s):  
M. Keown ◽  
N. Chauhan ◽  
C. Shiach ◽  
A. M. H. P. van den Besselaar ◽  
A. Tripodi ◽  
...  

SummaryThe object was to assess the variability in displayed International Normalised Ratio (INR) between monitors of the same manufacture using whole blood samples from the same subjects. Two brands of monitor, CoaguChek Mini and the TAS PT-NC were tested.14 instruments of each brand were tested on the same day at the same laboratory by the same operator using identical blood samples to avoid between-centre differences in samples and operator technique. Whole blood samples from two normal donors and four coumarintreated patients were tested to assess between-instrument variability of INR.Results have been coded. There was a much wider dispersion of INR on Brand B than on Brand A. One Brand A instrument failed to give a result with one of the two whole blood samples from one patient. One Brand B monitor gave an aberrant result with one of the samples from a normal subject.On both brands of monitor, INR variability appeared to be due mainly to duplication differences rather than between-instrument variability on both normal and coumarin whole blood samples.


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