There
are many names of capillary fragility tests, it can be HESS
test or tourniquet test. But
the purpose of the test is the same.
This is also
used to diagnose dengue.
Capillary
fragility test (tourniquet test) principle
A tourniquet test or Hess test, at 80 mm Hg pressure at
forearm causes obstruction of and obstructs venous blood return raises the
blood pressure in the capillaries. This pressure causes the rupture of
capillaries and causes petechiae at the antecubital fossa.
Tourniquet
test test requirements
1.Hess’s test is simple. We don’t need specific machines or
instruments. We need only one thing.
2.Sphygmomanometer
Hess test procedure
(Tourniquet test)
Here is the procedure of the HESS test.
1.Apply the Sphygmomanometer cuff on arm and inflate it to
80 mm Hg pressure.
2.Keep this pressure for FIVE minutes.
3.After five minutes, check the volar surface of the
forearm for the appearance of petechiae at the antecubital fossa.
4.If you found petechiae, count the petechiae in a 3 cm2 area.
5.If you found twenty (20) petechiae in this area, then the
result is positive.
Capillary fragility test (Hess test) purpose
Hess test or
capillary fragility test has THREE purposes.
1.Check the capillary RESISTANCE.
2.It is used to check the Platelets NUMBER in
the blood.
3.Hess test is used to monitor the platelets FUNCTION in
the body.
4.Tourniquete test used to diagnose the dengue.
Factors affecting capillary
fragility test (HESS TEST)
There are two main factors that affect the capillary
fragility test.
1.Time is an important factor. Apply Sphygmomanometer cuff
for only 5 minutes. More than 5 minutes or less than 5 minutes can affect the
result.
Sphygmomanometer
pressure is also an important factor.80 mm Hg pressure should be applied.
More than or less than 80 mm Hg pressure can alter the fragility result.
Hess test positive
3.If petechiae appear at the antecubital fossa after
80 mm Hg pressure, it means hess test positive. The patient has a low platelets
count or platelets function defects.
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