What are the limitations of the phaeochromocytoma pre test probability?

While the phaeochromocytoma pre test probability is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the phaeochromocytoma pre test probability to ensure safe bedside use and optimal diagnostic accuracy.

How does the phaeochromocytoma pre test probability compare to other Endocrinology scores?

The phaeochromocytoma pre test probability is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the phaeochromocytoma pre test probability free to use?

Yes. OpiCalc provides the phaeochromocytoma pre test probability completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

Phaeochromocytoma pre test probability Score and Guidance

CLINICAL REFERENCE

CLINICAL INSIGHT

When to Use

When to Screen

Presence of paroxysmal Hypertension, Headache, Palpitations, or Diaphoresis.
Incidentally discovered adrenal mass with > 10 Hounsfield Units (HU) on CT.
Unexplained spells of anxiety or panic accompanied by tachycardia.
Resistant hypertension or hypertension starting at a young age (< 20 years).
Family history of MEN2, VHL, or NF1.

CLINICAL INSIGHT

How it Works

First-line Biochemical Tests

Test	Sensitivity	Specificity
Plasma Free Metanephrines	96-99%	80-90%
24hr Urine Metanephrines	87-90%	95-99%

The Rule of 10s (Traditional)

10% Malignant (though now considered a continuous spectrum).
10% Bilateral.
10% Extradrenal (Paragangliomas).
10% Pediatric.
10% Familial (Now recognized as 30-40% genetic).

CLINICAL INSIGHT

Practical Pearls

Alpha Blockade Priority

NEVER start a beta-blocker before adequate alpha-blockade (e.g., Phenoxybenzamine or Doxazosin). Blocking beta-receptors first leaves alpha-receptors unopposed, which can lead to a hypertensive crisis from intense vasoconstriction.

The "Five Ps"

Clinical memory aid: Pressure (HTN), Pain (Headache), Perspiration (Diaphoresis), Palpitations, and Pallor.

CLINICAL INSIGHT

Evidence Base

Primary Source

Pheochromocytoma and paraganglioma: an endocrine society clinical practice guideline.

Lenders JW, et al.J Clin Endocrinol Metab2014

When to Use

When to Screen

How it Works

First-line Biochemical Tests

The Rule of 10s (Traditional)

Practical Pearls

Alpha Blockade Priority

The "Five Ps"

Evidence Base

Primary Source

Phaeochromocytoma Pre-test Probability

Low Probability

When to Use

When to Screen

How it Works

First-line Biochemical Tests

The Rule of 10s (Traditional)

Practical Pearls

Alpha Blockade Priority

The "Five Ps"

Evidence Base

Primary Source

Phaeochromocytoma Pre-test Probability

Low Probability

Clinical Evidence and Methodology

When to Use

When to Screen

How it Works

First-line Biochemical Tests

The Rule of 10s (Traditional)

Practical Pearls

Alpha Blockade Priority

The "Five Ps"

Evidence Base

Primary Source

Phaeochromocytoma Pre-test Probability

Low Probability

Clinical Evidence and Methodology

When to Use

When to Screen

How it Works

First-line Biochemical Tests

The Rule of 10s (Traditional)

Practical Pearls

Alpha Blockade Priority

The "Five Ps"

Evidence Base

Primary Source

Phaeochromocytoma Pre-test Probability

Low Probability