An RBC (red blood cell) mineral test measures the levels of various minerals inside your red blood cells. This test provides a more accurate assessment of your mineral status compared to serum tests, as it reflects longer-term mineral status rather than short-term fluctuations. Here’s a breakdown of what’s typically included in an RBC mineral test. 1. Magnesium (Mg) • Role: Magnesium helps relax blood vessels, which can lower blood pressure. • Importance in RBC: Low magnesium levels in RBCs can