Phentolomine test Test used to lower blood pressure in a person with pheochromocytoma. Phosphorus level Blood test. Influenced by estrogens and many other medications. Fasting required before test. The sample can be drawn at any time during the day.
Results are higher in pregnant and breast-feeding women.
See chapter 3. Serum aldosterone Blood test. Diuretics, antihypertensive drugs, some hormone medications, and licorice should be avoided 2-4 weeks before tests. A normal sodium diet should be ingested for 2-4 weeks before tests. Levels may be low in diabetics.