Lab Test : Bleeding Time

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Alternate:Ivy Bleeding Time; Ivy Template
Phone:(937) 641-3430
SQ Code:BT
Available:Daily, 24 hours
Turnaround:Routine: 3 hours, STAT: 30 min
Specimen:An in vivo test done directly on the patient
Rejection:The Bleeding Time cannot be performed on a patient with a platelet count under 100 x 103/ÁL. It is not recommended that children under 3 yrs. of age have this test performed due to the fact that they are more active during the testing. When children of any age need to be restrained the stress and attempted movement will most likely result in prolonged results. This can also result when a patient has cold hands, edema of the hands, and cyanotic extremities. The test can not be done when a pressure cuff can not be placed on either arm. The test may cause excessive scarring on a patient with a history of keloid formation.
Normal:Age 5 months to 15 years: to 9.0 minutes Age 15 years to adult: to 8.0 minutes
Uses:A more comprehensive test: Platelet Function Sceen utilizing epinephrine and ADP is available in place of a BT. This test is used to assess capillary function, platelet function, and the ability of platelets to adhere to the vessel wall and form a plug. The bleeding time is prolonged in cases of aspirin sensitivity and von Willebrand's disease. This test is useful in evaluation of ecchymosis, easy bleeding, spontaneous bruising, spontaneous bleeding and bleeding into the skin. The Bleeding Time is a screening test. Results of this test alone are NOT sufficient to diagnose specific conditions.
Limitations:Occasionally disorders attributed to abnormalities of the blood vessels will prolong the Bleeding Time. A low platelet count will prolong the bleeding time. Patients receiving medication containing aspirin should not undergo the Bleeding Time for at least a week after receiving the aspirin medication to avoid a prolonged bleeding time. The patient with an established severe bleeding diatheses may result in a prolonged bleeding time. A prolonged bleeding time may be exhibited by a patient with an infectious disease of the skin. Any drug of the acetyl groups may cause a prolonged bleeding time. Senile skin changes can prolong the bleeding time even in the presence of normal platelet function. When there is a prior history of keloid formation, the doctor should discuss the probability of severe scarring with the parents or the patient. Multiple testing of these severely scarred patients can result in limited areas of normal skin texture on which to perform future bleeding times. Drugs capable of inducing a prolonged Bleeding Time in the presence of a normal platelet count: anti-inflammatory Drugs: Aspirin Naproxen Indomethacin Ibuprofen Antibiotics: Ampicillin Naficillin Azlocillin Nitrofurantion Carbenicillin Penicillin Mithramycin Piperacillin Moxalactum Ticarcillin Anticoagulants: Dextran Prostacyclin Heparin Miscellaneous: Aminocaproic acid Ethanol Radiographic Halothane contrast agents Nitroglycerin Fluoxetine

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