jes-pa-bypass-confirmatory

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name: jes-pa-bypass-confirmatory description: Identifies patients with a positive aldosterone-to-renin ratio screening who may proceed directly to subtype testing without confirmatory testing based on specific clinical criteria. Triggers include spontaneous hypokalemia, baseline plasma aldosterone concentration >100 pg/mL (CLEIA), renin suppression, or a clinician questioning the need for a confirmatory test after a positive screen.

Determine when confirmatory testing can be bypassed for PA diagnosis

STEP 1 — Gather Information

Collect screening results: aldosterone-to-renin ratio (ARR) ≥200 (PAC/PRA) or ≥40 (PAC/ARC) with PAC ≥60 pg/mL (CLEIA); note spontaneous hypokalemia (serum K+ <3.5 mEq/L), baseline PAC >100 pg/mL (CLEIA), and renin suppression (PRA <0.5 ng/mL/h or ARC <2.5 pg/mL).

STEP 2 — Rule In / Rule Out

If the patient has a positive screening test AND exhibits spontaneous hypokalemia, baseline PAC >100 pg/mL (CLEIA), and renin suppression, rule in for bypassing confirmatory test; otherwise, rule out bypass and proceed to confirmatory testing.

STEP 3 — Classify or Stratify

Classify as eligible for confirmatory test bypass when all three criteria (spontaneous hypokalemia, high baseline PAC, renin suppression) are present; stratify as not eligible if any criterion is missing.

STEP 4 — Decide

Decide to skip confirmatory testing and move directly to subtype testing (e.g., adrenal venous sampling) for patients meeting all bypass criteria; for those not meeting criteria, order a confirmatory test (e.g., captopril challenge test or saline infusion test).

Clinical Guardrails / Mimics / Pitfalls

Do not bypass confirmatory testing in patients with borderline PAC (60–100 pg/mL CLEIA), normokalemia, or incomplete renin suppression; avoid mistaking diuretic-induced hypokalemia for spontaneous hypokalemia; remember that bypass does not exclude the need for subtype testing before adrenalectomy.

Concrete Clinical Example

A 45-year-old hypertensive patient presents with spontaneous hypokalemia (K+ 3.0 mEq/L), screening ARR 250 (PAC/PRA) with PAC 120 pg/mL (CLEIA), and PRA 0.2 ng/mL/h. All bypass criteria are met, so confirmatory testing is skipped and adrenal venous sampling is performed for subtype classification.

Source: Japan Endocrine Society clinical practice guideline for the diagnosis and management of primary aldosteronism 2021, Japan Endocrine Society, 2021