Calcium and phosphorus homeostasis is tightly regulated by parathyroid hormone (PTH), vitamin D, and renal function. Disruptions in this balance yield distinct laboratory patterns. Match each of the following serum laboratory profiles to its most likely underlying pathophysiologic diagnosis.
- Decreased serum calcium, elevated intact PTH, and elevated serum phosphorusAdvanced chronic kidney disease
- Elevated serum calcium, inappropriately normal or elevated intact PTH, and decreased serum phosphorusPrimary hyperparathyroidism
- Decreased serum calcium, decreased intact PTH, and elevated serum phosphorusPrimary hypoparathyroidism
- Elevated serum calcium, appropriately suppressed intact PTH, and decreased serum phosphorusHumoral hypercalcemia of malignancy
Cevap
The laboratory profiles correctly map to their underlying pathophysiologic states based on the physiological feedback loops between calcium, phosphorus, and PTH. Primary parathyroid disorders drive calcium and phosphorus in opposite directions, while secondary disorders reflect appropriate parathyroid compensation.
Each diagnosis produces a unique signature of calcium, phosphorus, and intact PTH based on renal, bone, and parathyroid pathophysiology. Recognizing these specific combinations is essential for accurate endocrine diagnosis and management.
Adım Adım Çözüm
Anahtar Kavram
Pathophysiological laboratory patterns in calcium and phosphorus metabolism.