Calcium, magnesium and phosphorus are never read one at a time. Calcium hides behind albumin, phosphorus moves opposite calcium, and potassium will not correct while magnesium is low. Move the sliders or load a real panel, then read the corrected calcium, the bedside signs each value predicts, and the cross-talk that explains a value refusing to budge.
Load a real panel
Or dial the values yourself
8.5–10.5 mg/dL
3.5–5.0 g/dL
1.5–2.5 mEq/L
2.5–4.5 mg/dL
3.5–5.0 mEq/L
Read the units on the report. Magnesium is reported as 1.5 to 2.5 mEq/L in this chapter, which is roughly 1.8 to 3.0 mg/dL depending on the laboratory. Ionised (free, physiologically active) calcium is 4.5 to 5.6 mg/dL — in a critically ill patient order the ionised level and skip the arithmetic.