The tourniquet test is part of the new WHO case definition for dengue.
The test is a marker of capillary fragility and it can be used as a triage tool
to differentiate patients with acute gastroenteritis, for example, from
those with dengue. Even if a tourniquet test was previously done, it
should be repeated if
It was previously negative
There is no bleeding manifestation
How to do a Tourniquet Test
1.Take the patient's blood pressure and record it, for example,
2.Inflate the cuff to a point midway between SBP and DBP and
maintain for 5 minutes. (100 + 70) ÷ 2 = 85 mm Hg
3.Reduce and wait 2 minutes.
4.Count petechiae below antecubital fossa. See image at right.
A positive test is 10 or more petechiae per 1 square inch.
Positive tourniquet test with greater than
10 petechiae per one square inch