Final answer:
Serum Mg2+ levels less than 1.5 mEq/L indicate hypomagnesemia, which is associated with various conditions including uremia and abnormal pregnancy, and can co-occur with hypercalcemia and other electrolyte imbalances.
Step-by-step explanation:
When serum Mg2+ levels are less than 1.5 mEq/L, this condition is known as hypomagnesemia. Hypomagnesemia can occur in various conditions such as uremia, pregnancy (normal and abnormal), recovery from a diabetic coma, and in association with other electrolyte imbalances like hypercalcemia, hyperphosphatemia, and hypokalemia. It's important for the body to maintain adequate magnesium levels, as it is involved in numerous cellular processes and metabolic functions.