Hypovolemia is detected through the tilt test.
The tilt test measures postural changes in blood pressure and heart rate.
To perform this procedure asks the patient to lie supine.2 minutes in the supine position is important to cause maximum leg pooling of blood. This results in maximal drop in cardiac output and maximal increase in heart rates upon re standing.
Therefore 2 minutes in supine position increases the sensitivity of tilt test. Patient should not lie supine more than 2 minutes.
Wait at least 2 minutes then measure the blood pressure and heart rate in this position. Patient is asked to stand. Wait for 1 minute. Blood pressure and heart are measured while the patient is standing. Heart rate is measured by counting over 30 minutes and multiple by 2.