What are the limitations of the prolactin interpretation tool?

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

How does the prolactin interpretation tool compare to other Endocrinology scores?

The prolactin interpretation tool 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 prolactin interpretation tool free to use?

Yes. OpiCalc provides the prolactin interpretation tool completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

Evidence-Based Prolactin interpretation tool Scoring

CLINICAL REFERENCE

CLINICAL INSIGHT

When to Use

When to Screen

Investigation of secondary amenorrhoea or oligomenorrhoea.
Evaluating galactorrhoea in women or men.
Workup for male hypogonadism and erectile dysfunction.
Monitoring known pituitary adenomas.

CLINICAL INSIGHT

How it Works

Interpretation based on ng/mL

Level (ng/mL)	Typical Causes
< 25	Normal Range
25 – 100	Drugs, Stalk Effect, Hypothyroidism, PCOS, Macroprolactin
100 – 250	Microprolactinoma, Risperidone, Metoclopramide
> 250	Macroprolactinoma (almost certainly)

CLINICAL INSIGHT

Practical Pearls

The Hook Effect

In extremely large macroprolactinomas, very high prolactin levels can saturate the assay antibodies, leading to a falsely low or normal result (the "Hook Effect"). If a large macroadenoma is present but prolactin is only mildly elevated, repeat the assay with clinical dilution.

Macroprolactin

Macroprolactin is a large complex of prolactin molecules bound to IgG. It is biologically inactive but is detected by standard prolactin assays. If a patient is asymptomatic despite high prolactin, ask the lab for "PEG precipitation" to screen for macroprolactin.

CLINICAL INSIGHT

Evidence Base

Primary Source

Diagnosis and treatment of hyperprolactinemia: an Endocrine Society clinical practice guideline.

Melmed S, Casanueva FF, et al.J Clin Endocrinol Metab2011

When to Use

When to Screen

How it Works

Interpretation based on ng/mL

Practical Pearls

The Hook Effect

Macroprolactin

Evidence Base

Primary Source

Prolactin Interpretation Tool

When to Use

When to Screen

How it Works

Interpretation based on ng/mL

Practical Pearls

The Hook Effect

Macroprolactin

Evidence Base

Primary Source

Prolactin Interpretation Tool

Clinical Evidence and Methodology

When to Use

When to Screen

How it Works

Interpretation based on ng/mL

Practical Pearls

The Hook Effect

Macroprolactin

Evidence Base

Primary Source

Prolactin Interpretation Tool

Clinical Evidence and Methodology

When to Use

When to Screen

How it Works

Interpretation based on ng/mL

Practical Pearls

The Hook Effect

Macroprolactin

Evidence Base

Primary Source

Prolactin Interpretation Tool