Endo Against 25ohd Test Obesity

---
name: endo-against-25ohd-test-obesity
description: Recommends against routine screening for 25(OH)D levels in adults with obesity (BMI ≥30 kg/m²). Use when a clinician considers ordering a 25(OH)D test for an obese patient without established indications for vitamin D testing.
---

# Against routine 25(OH)D testing in adults with obesity

## STEP 1 — Gather Information
Measure BMI and assess for established indications for 25(OH)D testing (e.g., hypocalcemia, malabsorption syndromes, renal osteodystrophy, hepatogenic osteoporosis, or symptoms such as bone pain, proximal muscle weakness, unexplained fractures). Document absence of these indications.

## STEP 2 — Rule In / Rule Out
If BMI ≥30 kg/m² **and** no established indication for 25(OH)D testing → proceed to Step 3 (classify as obese without indication). Otherwise → consider 25(OH)D testing per the identified indication and stop using this skill.

## STEP 3 — Classify or Stratify
Classify the patient as an adult with obesity (BMI ≥30 kg/m²) lacking established indications for 25(OH)D testing.

## STEP 4 — Decide
Recommend against routine 25(OH)D testing; do not order the test solely based on obesity. If vitamin D repletion is clinically indicated for other reasons (e.g., osteoporosis, falls, known deficiency symptoms), follow condition‑specific guidance without relying on a 25(OH)D level.

## Clinical Guardrails / Mimics / Pitfalls
Do not use obesity alone as a trigger for 25(OH)D testing; avoid interpreting low 25(OH)D levels in obesity as requiring repletion without established benefit thresholds. Do not delay empiric vitamin D for proven indications (e.g., treatment of osteoporosis) pending a test result. Recognize that 25(OH)D assays vary and obesity‑related sequestration does not define a therapeutic target.

## Concrete Clinical Example
A 52‑year‑old woman with BMI 34 kg/m² requests a vitamin D level check during a wellness visit. She denies hypocalcemia, malabsorption, bone pain, or fractures. Applying the skill: BMI ≥30 kg/m² and no established indication → recommend against routine 25(OH)D testing.

**Source:** Vitamin D for the Prevention of Disease: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2024, https://doi.org/10.1210/clinem/dgae290