Tests
Further tests [2] may be needed. Your doctor may recommend a blood test to check the levels of electrolytes like potassium and calcium in your blood. They may also check your thyroid and kidney function. This is because muscle cramps may arise from electrolyte imbalance. This imbalance may also be caused by problems with kidney function.
Some doctors also recommend pregnancy tests. In certain cases, your doctor may suggest you get an electromyography (EMG) to check muscle activity and see if there is any abnormality in your muscles.
Other tests your doctor may recommend include a myelogram and magnetic resonance imaging (MRI). Both are imaging tests that may help your doctor reach a conclusive diagnosis.
In most cases of muscle cramps, questions are enough for doctors to make a recommendation. Further tests are only required if the cramps do not respond to treatment and the underlying cause is obscure.