Often yes—many mineral deficiencies can be identified with the right tests and interpretation. But there is no single universal test for “minerals,” and some markers have limitations. Iron status typically uses ferritin plus a CBC (and sometimes transferrin saturation). Serum magnesium can be measured, yet it may not fully reflect intracellular stores in some cases; symptoms and risk factors matter. Zinc can be measured, but results may be influenced by acute inflammation or infection. Electrolytes (sodium, potassium, calcium) can shift rapidly in acute illness, diarrhea, or with diuretics. Therefore, symptom-guided testing and clinician interpretation—considering medications, diet, comorbidities, and timing—are essential. Avoid high-dose supplementation based solely on self-interpreted results.\n\nSource note: NIH ODS mineral fact sheets (testing and clinical considerations).