Salt sensitivity test

A simple test is designed  to determine salt sensitivity. There are three phases of this test, which have been shown as follows

Phase 1

  • Consume a absolutely normal diet to establish the lower baseline salt intake.
  • Now, measure blood pressure
  • Determine urinary salt intake.

Phase 2

  • Consume a 2 gms salt-restricted diet for 2 weeks.
  • Measure blood pressures
  • If DBP<90mm Hg, the patient is salt-sensitive and its urine sample should be collected for 24 hrs.
  • After 1 month, if DBP is >90 mm Hg, with a urinary NaCl of <2gms/24 hrs, then patient is salt-resistant.

Phase 3

  • Consume a 2 gms salt diet, but add 1 gm of salt/day
  • Each1gm increase in salt is consumed for 3 days, blood pressure is measured at each step.
  • When DBP is>90 mm Hg, then 24-hr urine is collected
  • By this a threshold for salt intake is established.

             DBP = Diastolic Blood Pressure.