Tourniquet test: Difference between revisions

Latest revision as of 05:23, 16 February 2025

Tourniquet Test[edit]

The tourniquet test, also known as the capillary fragility test or Rumpel-Leede test, is a clinical diagnostic tool used to assess capillary fragility and platelet function. It is often employed in the evaluation of dengue fever and other conditions that affect the vascular system.

A positive tourniquet test showing petechiae formation.

Procedure[edit]

The tourniquet test is performed by applying a blood pressure cuff to the upper arm and inflating it to a point midway between the systolic and diastolic blood pressures. The cuff is maintained at this pressure for a specified period, usually 5 minutes. After the cuff is deflated, the forearm is examined for the appearance of petechiae, which are small red or purple spots caused by bleeding into the skin.

Interpretation[edit]

A positive tourniquet test is indicated by the presence of 10 or more petechiae per square inch on the forearm. This result suggests increased capillary fragility or a defect in platelet function. A positive test is commonly associated with conditions such as dengue fever, thrombocytopenia, and other coagulation disorders.

Clinical Significance[edit]

The tourniquet test is particularly useful in the diagnosis of dengue fever, where it is one of the criteria for clinical diagnosis according to the World Health Organization (WHO). In dengue, the test reflects the increased vascular permeability and capillary fragility that are characteristic of the disease.

Limitations[edit]

While the tourniquet test can provide valuable diagnostic information, it is not specific to any single condition and should be interpreted in the context of other clinical findings and laboratory tests. False positives can occur in individuals with naturally fragile capillaries or those taking medications that affect platelet function.

Related Pages[edit]

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-'''Tourniquet test''' is a medical diagnostic test used primarily to identify the presence of [[dengue fever]]. The test is named after the device used in the procedure, a [[tourniquet]], which is a constricting or compressing device used to control venous and arterial circulation to an extremity for a period of time.
+== Tourniquet Test ==
-==Procedure==
+The '''tourniquet test''', also known as the '''capillary fragility test''' or '''Rumpel-Leede test''', is a clinical diagnostic tool used to assess capillary fragility and platelet function. It is often employed in the evaluation of [[dengue fever]] and other conditions that affect the [[vascular system]].
-The tourniquet test is performed by inflating a blood pressure cuff on the upper arm to a point mid-way between the systolic and diastolic blood pressures for five minutes. The test is positive if more than 20 petechiae per square inch or 3 cm² are observed on the skin below the cuff. The test is used in the diagnosis of diseases such as dengue fever and [[rickettsial infections]].
-==Interpretation==
+[[File:Positive-tourniquet-test.gif|thumb|right|A positive tourniquet test showing petechiae formation.]]
-A positive tourniquet test is one of the major warning signs of severe dengue fever. However, a negative test does not rule out dengue fever. The test is less sensitive in cases of secondary dengue infection. The test can also be positive in other medical conditions such as [[vitamin C deficiency]] and [[idiopathic thrombocytopenic purpura]].
-==Limitations==
+=== Procedure ===
-The tourniquet test has several limitations. It is less sensitive in secondary dengue infections. The test can also be positive in other medical conditions such as vitamin C deficiency and idiopathic thrombocytopenic purpura. The test is also subjective and depends on the skill of the person performing the test.
+The tourniquet test is performed by applying a blood pressure cuff to the upper arm and inflating it to a point midway between the systolic and diastolic blood pressures. The cuff is maintained at this pressure for a specified period, usually 5 minutes. After the cuff is deflated, the forearm is examined for the appearance of [[petechiae]], which are small red or purple spots caused by bleeding into the skin.
+=== Interpretation ===
+A positive tourniquet test is indicated by the presence of 10 or more petechiae per square inch on the forearm. This result suggests increased capillary fragility or a defect in platelet function. A positive test is commonly associated with conditions such as [[dengue fever]], [[thrombocytopenia]], and other [[coagulopathy|coagulation disorders]].
+=== Clinical Significance ===
+The tourniquet test is particularly useful in the diagnosis of [[dengue fever]], where it is one of the criteria for clinical diagnosis according to the World Health Organization (WHO). In dengue, the test reflects the increased vascular permeability and capillary fragility that are characteristic of the disease.
+=== Limitations ===
+While the tourniquet test can provide valuable diagnostic information, it is not specific to any single condition and should be interpreted in the context of other clinical findings and laboratory tests. False positives can occur in individuals with naturally fragile capillaries or those taking medications that affect platelet function.
+== Related Pages ==
-==See also==
 * [[Dengue fever]]
-* [[Rickettsial infections]]
+* [[Thrombocytopenia]]
-* [[Vitamin C deficiency]]
+* [[Coagulation disorders]]
-* [[Idiopathic thrombocytopenic purpura]]
+* [[Petechiae]]
 [[Category:Medical tests]]
-[[Category:Dengue fever]]
+[[Category:Hematology]]
-[[Category:Rickettsial infections]]
-[[Category:Vitamin C deficiency]]
-[[Category:Idiopathic thrombocytopenic purpura]]
-{{stub}}