Problem: A 54 year old woman presented to her primary care provider for symptoms of urinary tract infection. since her nurse practitioner did not see her for more than 1 yeat, lab tests were drawn. creatinine 1.1. sodium 135, potassium 4.5. calcium 11.1, albumin 4.5. the np calls the patient after recieving the lab results and directs the patient to have more lab tests performed.which is the most appropriate labt tests? a. parathyroid hormone, b. phosphorus, c. vitamin D, d. magnesium