*  PTT: The Test | Partial Thromboplastin Time; PTT Test: Partial Thromboplastin Time; Activated Partial Thromboplastin Time; APTT...
Explains how the PTT is used, when a PTT is ordered, and what the results of a PTT might mean. The PTT is used primarily to investigate unexplained bleeding or clotting. It may be ordered along with a prothrombin time (PT) test to evaluate hemostasis.
  https://labtestsonline.org/understanding/analytes/aptt/tab/test
*  "Evaluation of Activated Partial Thromboplastin Time (aPTT) Reagents fo" by Magdalena Dudek, Leanne F. Harris et al.
Introduction: The most commonly used test for monitoring heparin therapy is the activated partial thromboplastin time (aPTT). The response of available aPTT reagents to heparin varies significantly. The aim of this study was to highlight the differences between aPTT reagents stored in a dried format to select the most suitable formulations to be used for the development of point-of-care diagnostic devices used for monitoring of unfractionated heparin dose response. Methods: Ten reagents were analysed in terms of their performance in liquid and in dried form after storage for 24 h and 14 days. Performance was assessed by measurement of the clotting time (CT) as evidenced by the onset of thrombin formation using a chromogenic thrombin substrate in plasma samples activated with these formulations. Results: Reagents in all of the three forms tested (liquid, 24 h and 14 days) resulted in significant shortening of CTs in comparison with the nonactivated plasma CT. Liquids returned more rapid CTs ...
  https://arrow.dit.ie/scschbioart/152/
*  Unsuitability of evacuated tubes for monitoring heparin therapy by activated partial thromboplastin time. | Journal of Clinical...
Activated partial thromboplastin times (APTT) for monitoring heparin therapy for venous thromboembolism tended to be inappropriately short if blood was collected in commercially available evacuated glass tubes. Five types of evacuated tubes marketed under the trade names Vacutainer and Venoject were examined. The APTT of heparinized blood collected in these tubes correlated poorly (r = 0.04 to 4 = 0.25) with that of blood samples from the same patients collected in plastic tubes. Most of the evacuated tube APTT were shorter than that of blood collected in plastic or siliconised glass tubes, but the results were unpredictable and varied from tube to tube and from batch to batch. This effect on heparin is apparently due to an unidentified substances which is eluted from the rubber stoppers of the tubes. Heparin control according to the APTT blood collected in these evacuated tubes is hazardous.. ...
  http://jcp.bmj.com/content/34/1/63
*  Blood Test: Partial Thromboplastin Time (PTT)
A partial thromboplastin time (PTT) test measures how long it takes for a clot to form in a blood sample. A clot is a thick lump of blood that the body produces to seal leaks, wounds, cuts, and scratches and prevent excessive bleeding.. The blood's ability to clot involves platelets (also called thrombocytes) and proteins called clotting factors. Platelets are oval-shaped cells made in the bone marrow. Most clotting factors are made in the liver.. When a blood vessel breaks, platelets are first to the area to help seal off the leak and temporarily stop or slow the bleeding. But for the clot to become strong and stable, the action of clotting factors is required.. The body's clotting factors are numbered using the Roman numerals I through XII. They work together in a specialized sequence, almost like pieces of a puzzle. When the last piece is in place, the clot develops - but if even one piece is missing or defective, the clot can't form.. The PTT test is used to evaluate the ability of a ...
  https://www.rchsd.org/health-articles/blood-test-partial-thromboplastin-time-ptt/
*  Sequential thrombosis and bleeding in a woman with a prolonged activated partial thromboplastin time.
Simultaneous or sequential haemorrhage and thrombosis in the presence of a prolonged activated partial thromboplastin time (aPTT) is a rare occurrence: we describe the case a 37 year old lady who developed post-delivery deep vein thrombosis treated w
  http://www.biomedsearch.com/nih/Sequential-thrombosis-bleeding-in-woman/22032246.html
*  Blood Test: Partial Thromboplastin Time (PTT)
A partial thromboplastin time (PTT) test is used to evaluate blood's ability to clot. It may be done as part of an evaluation for a bleeding disorder or to monitor the effects of blood-thinning medicine.
  http://kidshealth.org/ChildrensHealthNetwork/en/parents/test-ptt.html
*  Blood Test: Partial Thromboplastin Time (PTT)
A partial thromboplastin time (PTT) test is used to evaluate blood's ability to clot. It may be done as part of an evaluation for a bleeding disorder or to monitor the effects of blood-thinning medication.
  http://kidshealth.org/RadyChildrens/en/parents/test-ptt.html?view=rr
*  Study of dabigatran on the activated partial thromboplastin time and activated clotting time in artrial fibrillation patients -...
This study investigated the effect of dabigatran on the activated partial thromboplastin time and activated clotting time in artrial fibrillation patients.
  http://adisinsight.springer.com/trials/700263972
*  Correlation of whole blood activated partial thromboplastin time and plasma activated partial thromboplastin time in...
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  http://oxfordindex.oup.com/view/10.1093/oxfordjournals.ndt.a027236
*  APPT, Complementary and Alternative Healing Univ
Activated Partial Thromboplastin Time (APTT). Edited by Joe Hing Kwok Chu. This test is a modification of the Partial Thromboplastin Time (PTT). PTT does not contain added contact activator and is relatively insensitive to the effect of heparin.. APTT (activated partial thromboplastin time) is where PTT adds a contact activator to its reagent, thus activating factor XII (contact factor), and shortening the clotting time.. The APTT test is sensitive to heparin and evaluates all the clotting factors except factors VII and factor XIII.. Reference Range of Test: A fibrin clot forms 2.5 to 3.8 seconds after the reagent is added to the specimen.. Back to Wafarin. Sponsors' Ads by Google 仧三炷谻歊扃揓侙贄劮耉乌廫呉. ...
  http://alternativehealing.org/APTT.htm
*  Activated partial thromboplastin time correlates with methoxyhydroxyphenylglycol in acute myocardial infarction patients :...
BACKGROUND/AIM: Acute myocardial infarction (AMI) is associated with increased coagulation which in the presence of unstable atheroma or endothelial damage leads to occlusive coronary vessel thrombosis. AMI is usually characterized by increased levels of catecholamines. It is possible there may be a link between catecholamines and hypercoagulation, but this still remains to be determined. In the current study we sought to verify whether hypercoagulation is associated with hypersympathetic activity in AMI patients, and whether there is a correlation between increased Methoxyhydroxyphenylglycol (MOPEG) levels (a metabolite of catecholamines) and shorter APTT (a marker of hypercoagulation). RESULTS: Shorter APTT values were detected in the plasma of AMI patients, which had also increased MOPEG levels. A linear correlation between APTT and MOPEG values was observed. High levels of the coagulation marker prothrombin (fragments 1+2) were also found. CONCLUSION: Shortened APTT demonstrates ...
  https://air.unimi.it/handle/2434/257246
*  Subcutaneous Heparin for Deep Venous Thrombosis | Annals of Internal Medicine | American College of Physicians
Prandoni and colleagues (1) suggest that subcutaneous unfractionated heparin is an attractive approach to treating deep venous thrombosis compared with the use of low-molecular-weight-heparin (LMWH) because of the lower cost of unfractionated heparin. The main problems associated with the use of unfractionated heparin are the high variability of the anticoagulant response and the lack of an accepted method of standardization in the activated partial thromboplastin time, which is used to monitor treatment. Because unfractionated heparin treatment must be monitored (2), each hospital must establish its own therapeutic range based on a calibration curve of activated partial thromboplastin time against heparin levels assessed by anti-Xa activity. This procedure is difficult to perform, and it does not guarantee a full comparison of the anticoagulation regimens in different hospitals ...
  http://annals.org/aim/article/712769/subcutaneous-heparin-deep-venous-thrombosis
*  "Point of Care Diagnostics: Status and Future" by Vladimir Gubala, Leanne Harris et al.
The most commonly used test for monitoring heparin therapy is the activated partial thromboplastin time (aPTT). The response of available aPTT reagents to heparin varies significantly. The aim of this study was to highlight the differences between aPTT reagents stored in a dried format to select the most suitable formulations to be used for the development of point-of-care diagnostic devices used for monitoring of unfractionated heparin dose response. METHODS: Ten reagents were analysed in terms of their performance in liquid and in dried form after storage for 24 h and 14 days. Performance was assessed by measurement of the clotting time (CT) as evidenced by the onset of thrombin formation using a chromogenic thrombin substrate in plasma samples activated with these formulations. RESULTS: Reagents in all of the three forms tested (liquid, 24 h and 14 days) resulted in significant shortening of CTs in comparison with the nonactivated plasma CT. Liquids returned more rapid CTs in comparison ...
  https://arrow.dit.ie/scschbioart/151/
*  Partial thromboplastin time (PTT) | University of Maryland Medical Center
You may need this test if you have problems with bleeding or your blood does not clot properly. When you bleed, a series of actions involving many different proteins (clotting factors) take place in the body that help the blood clot. This is called the coagulation cascade. The PTT test looks at some of the proteins or factors involved in this process and measures their ability to help blood clot.. The test may also be used to monitor patients who are taking heparin, a blood thinner.. A PTT test is usually done with other tests, such as the prothrombin test. ...
  https://www.umm.edu/Health/Medical/Ency/Articles/Partial-thromboplastin-time-PTT
*  Activated Partial Thromboplastin Time (APTT), Plasma - Holland Hospital Laboratory Services
Specimen Type: Platelet-poor plasma. Collection Container/Tube: Light-blue top (3.2% sodium citrate). Submission Container/Tube: Plastic vial. Specimen Volume: 1 mL. Collection Instructions: Spin down, remove plasma and spin plasma again.. Additional Information: Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.. ...
  http://hollandhospital.testcatalog.org/show/APTTP
*  Use of the Activated Partial Thromboplastin Time | Annals of Internal Medicine | American College of Physicians
To the Editor: In connection with a recent article (1), I pose a question.. Should peridural anesthesia in women with otherwise normal bleeding history be preceded by coagulation tests to prevent unexpected bleeding in the central nervous system? ...
  http://annals.org/aim/article/702537/use-activated-partial-thromboplastin-time
*  Partial Thromboplastin Time (PTT) | مختبرات دلتا الطبية
It is a blood test that measures how it takes for your blood to clot. A PTT test can be used to check for bleeding problems. Specifically it will detect deficiencies or inhibitors to the intrinsic (Factors VIII, IX, XI and XII) and common (Factors II, V, X and fibrinogen) pathway coagulation factors.
  http://delta-medlab.com/ar/node/793
*  Partial thromboplastin time (PTT) | Health Encyclopedia | FloridaHealthFinder.gov
The Agency for Health Care Administration (Agency) and this website do not claim the information on, or referred to by, this site is error free. This site may include links to websites of other government agencies or private groups. Our Agency and this website do not control such sites and are not responsible for their content. Reference to or links to any other group, product, service, or information does not mean our Agency or this website approves of that group, product, service, or information.. Additionally, while health information provided through this website may be a valuable resource for the public, it is not designed to offer medical advice. Talk with your doctor about medical care questions you may have.. ...
  http://www.floridahealthfinder.gov/healthencyclopedia/Health%20Illustrated%20Encyclopedia/1/003653.aspx
*  DVT & PE Mgt US Guidelines.html
LMWH does not require monitoring for therapeutic effect, and does not prolong APTT or TCT at therapeutic levels as much as does standard UFH. The effectiveness of UFH therapy is usually monitored by the activated partial thromboplastin time (APTT) or the thrombin time (also referred to as the thrombin clotting time, or TCT). The APTT is readily available and relatively inexpensive. Several studies have shown that anticoagulation guided by nomograms is superior to individual physician-guided therapy, which varies significantly. Published nomograms have been based on the APTT. Table 2 is one such nomogram, in which initial heparin dose is based on patient weight (the best predictor of heparin requirements), and subsequent dose changes are based on the APTT. An APTT ratio of 1.5-2.5 x control is generally considered therapeutic. Unlike the APTT, the TCT does not require addition of a thromboplastin, and it is not affected by acute phase increases in plasma proteins or ...
  http://www.healthcoachmd.com/handouts/dvt%20&%20pe%20mgt%20us%20guidelines.html
*  Safety and Efficacy of Lean Body Weight-based IV Heparin Dosing in Obese/Morbidly Obese Patients - Full Text View -...
Unfractionated Heparin has been used as an anticoagulant in various disease states and conditions, such as atrial fibrillation, deep vein thrombosis (DVT), pulmonary embolism (PE), myocardial infarction, acute coronary syndrome, and peripheral vascular disease. Prior studies have demonstrated that a weight-based heparin (WBH) dosing regimen is superior to a fixed dosing regimen (e.g. 5000 units bolus and 1000 units/hour) in achieving a therapeutic activated partial thromboplastin time (aPTT) more quickly and with fewer complications (1,2). The importance of achieving anticoagulation to a targeted aPTT range within 24 hours after starting intravenous heparin infusion has demonstrated a therapeutic benefit (1,3,30-31). WBH dosing is now the standard of care for intravenous heparin therapy.. Prior studies have assessed the benefit of WBH utilizing the patients' actual body weight (ABW), but have not significantly considered the issue of dosing and titrating WBH in the obese and morbidly obese ...
  https://clinicaltrials.gov/ct2/show/NCT01363193?recr=Open&cond=%22Obesity%22&rank=2
*  Helena Biosciences Europe :: APTT Si L Plus
APTT Si L Plus contains phospholipid extract and a near-colloidal particle activator. It is for use in the determination of Activated Partial Thromboplastin Times (aPTT) with sensitivity to lupus-like inhibitors, related coagulation factor assays, pre-surgical screening and monitoring of Heparin therapy using citrated plasma. The reagent can be used on manual, semi- automated and automated methods.. ...
  http://helena-biosciences.com/en/haemostasis/assays/routine/aptt-si-l-plus/
*  Effect of Antioxidant Vitamins on Coagulopathy and Nosocomial Pneumonia After Severe Trauma - Full Text View - ClinicalTrials...
Coagulation parameters are evaluated using standard functional tests (prothrombin time (PT), partial thromboplastin time (PTT), fibrinogen and platelet count)and point of care functional analysis using thromboelastogram (TEG-ROTEM). A blood sample is collected upon arrival in the emergency department at 0 hours only and analyzed for markers of activation of coagulation, inflammation, and levels of vitamin C/E ...
  https://clinicaltrials.gov/ct2/show/NCT01897792?recr=Open&intr=%22Ascorbic+Acid%22&rank=17
*  Hubungan Gangguan Hemostasis Dengan Penyakit Ginjal Kronik
Background : Chronic kidney disease ( CKD ) is a global health problem that continues to increase , CKD is usually associated with the likelihood of protrombik in the early stages of CKD and evolve further in end-stage renal disease , which can cause bledding disorder. Coagulation abnormality associated with kidney disease seen in CKD , acute renal failure , nephritic syndrome , glomerulonephritis , neoplasms and renal transplantation . Abnormal platelet function also occur due to accumulation of toxins metabolites . Hiperkoagulopati with a tendency for thrombosis may also occur . Fibrinolytic activity , anti - thrombin III and protein C is reduced and an increase in factor V , VII , VIII and X ( value of prothrombin time ( PT ) , activated partial thromboplastin time ( aPTT ) lengthwise ) . Methods : A cross-sectional study with consecutive sampling method on 30 patients in the inpatient unit and clinical disease in Adam Malik Hospital in Medan, were divided into three study groups , in ...
  http://repository.usu.ac.id/handle/123456789/44737
*  coagulation analyzer manufacturers
... Specifications∶ •Principle: dual-magnetic circuit bead method •Parameter:PT(Prothrombin Time),APTT,(Activated Partial Thromboplastin Time), TT (Thrombin Time), ...
  http://www.maikong.cc/coagulation-analyzer-manufacturers-2/
*  AID 789091 - Open TG-GATES: Regimen: Daily Repeat; Time: 15 day; Dose: Middle; Route: Gavage | Dataset: Hematology; Assay: APTT...
BioAssay record AID 789091 submitted by ChEMBL: Open TG-GATES: Regimen: Daily Repeat; Time: 15 day; Dose: Middle; Route: Gavage | Dataset: Hematology; Assay: APTT (Activated Partial Thromboplastin Time); Study_ID: 467/11.
  https://pubchem.ncbi.nlm.nih.gov/bioassay/789091