The Intact PTH with Creatinine & Calcium (Serum) test assesses parathyroid function and calcium regulation by measuring PTH, serum calcium, and kidney function through creatinine levels. It helps diagnose hyperparathyroidism and monitor calcium imbalances linked to kidney disorders, as impaired renal function can elevate PTH. This test provides a comprehensive view of the interplay between parathyroid activity and renal health.