How is the furosemide (Lasix) stimulation test used in the workup of primary aldosteronism?

Updated: Mar 24, 2020
  • Author: Gabriel I Uwaifo, MD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Answer

This test is often combined with the upright posture test. The typical test involves the oral administration of 40 mg of furosemide the night before as well as the morning of the test. On the morning of the test, after the furosemide dose has been administered, the patient remains upright 2-3 hours; then, S-Aldo and PRA levels are assayed. The interpretation of the test results is similar to that described above for the postural stimulation test.


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