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esa-pa-interpret-oral-sodium-loading

This skill interprets the oral sodium loading test for primary aldosteronism by evaluating 24‑hour urinary aldosterone excretion after a high‑sodium diet. Use when reviewing results of an "oral sodium loading test" for PA diagnosis; trigger phrases include "urinary aldosterone excretion ≤10 g/24 h" (PA unlikely) or "≥12 g/24 h (Mayo) / ≥14 g/24 h (Cleveland)" (PA highly likely).

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Interpret Oral Sodium Loading Test for PA

STEP 1 — Gather Information

Collect 24‑hour urinary aldosterone excretion (g/24h) after 3 days of oral sodium loading (~200 mmol Na⁺/day). Verify adequate slow‑release potassium supplementation, absence of severe uncontrolled hypertension, renal insufficiency, cardiac arrhythmia, or severe hypokalemia, and confirm proper urine collection timing (morning of day 3 to morning of day 4).

STEP 2 — Rule In / Rule Out

Is urinary aldosterone excretion ≤10 g/24h?

Yes → PA is unlikely (proceed to Step 4 – Decide: rule out PA).
No → proceed to Step 3.

STEP 3 — Classify or Stratify

Is excretion ≥12 g/24h (Mayo Clinic) or ≥14 g/24h (Cleveland Clinic)?

Yes → PA is highly likely.
No (10 g/24h < excretion < cutoff) → indeterminate range; consider alternative confirmatory testing.

STEP 4 — Decide

If PA unlikely: explore other causes of hypertension; avoid unnecessary adrenal work‑up.
If PA highly likely: advance to subtype classification (adrenal CT, then AVS if indicated).
If indeterminate: repeat the oral sodium loading test or perform another confirmatory test (e.g., saline infusion test, fludrocortisone suppression test).

Clinical Guardrails / Mimics / Pitfalls

Do not perform the test in patients with severe uncontrolled hypertension, renal insufficiency, cardiac arrhythmia, or severe hypokalemia. Ensure potassium supplementation to prevent hypokalemia‑induced false‑low aldosterone. Beware of renal metabolites (e.g., aldosterone‑18‑oxo‑glucuronide) that may blunt assay accuracy; use HPLC‑tandem mass spectrometry when available. Avoid testing in pregnancy. Inadequate 24‑h urine collection invalidates results.

Concrete Clinical Example

A 48‑year‑old woman with resistant hypertension and spontaneous hypokalemia undergoes oral sodium loading; her 24‑h urinary aldosterone excretion is 8 g/24h. Because this is ≤10 g/24h, PA is deemed unlikely, and the clinician investigates other secondary hypertension causes rather than pursuing adrenal venous sampling.

Source: The Management of Primary Aldosteronism: Case Detection, Diagnosis, and Treatment: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2016, DOI:10.1210/jc.2015-4061

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