# A client with CKD takes calcitriol for secondary hyperparathyroidism. Which lab finding most warrants holding the medication?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=391829&lang=en  
> language: en  
> subject: Medical Emergencies  
> category: PA

## Question

A client with CKD takes calcitriol for secondary hyperparathyroidism. Which lab finding most warrants holding the medication?

## Option

1. Parathyroid hormone 220 pg/mL — indicates ongoing secondary hyperparathyroidism
2. Hemoglobin 10.5 g/dL — indicates worsening anemia of chronic kidney disease
3. Serum calcium 11.0 with phosphate 5.5 — combined risk of metastatic calcification **✔ Correct answer**
4. Serum albumin 3.8 g/dL — suggests malnutrition could worsen hyperparathyroidism

**Correct answer: 3**

## Explanation

Correct (2): Calcitriol (active vitamin D) suppresses PTH but raises Ca and phosphate; hypercalcemia and hyperphosphatemia together raise Ca×P product → metastatic calcification (vasculature, soft tissue). Hold calcitriol when Ca >10.5 or Ca×P >55. (1) Indication for treatment. (3,4) Unrelated.

## In-depth explanation

Memory Tip Vit D analogs (calcitriol, paricalcitol, doxercalciferol) = "Watch Ca and P." Calcimimetic (cinacalcet, etelcalcetide) lowers PTH without raising Ca.

## Clinical scenario

Scenario 62-year-old male CKD 4 on calcitriol 0.25 mcg PO daily. Routine labs: Ca 11.0, phosphate 5.5, PTH 220.

## Key concepts

- **Calcitriol** — Active vitamin D; suppresses PTH but raises Ca and P.
- **Ca×P product** — Multiply Ca and P; >55 risks metastatic calcification.
- **Secondary hyperparathyroidism** — CKD-related; treated with vit D analogs, calcimimetics, phosphate binders.

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