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Pro-Surfactant B

Published: July 27, 2026Updated: August 25, 2026

Pro-Surfactant B is a protein precursor that is essential for the production of pulmonary surfactant, a substance that reduces surface tension in the lungs and prevents alveolar collapse.

Quick summary

Pro-Surfactant B is a diagnostic biomarker for lung surfactant production.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
ng/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche SP-B, Millipore SP-B
interpretation: {"text":"May indicate impaired surfactant production, potentially leading to respiratory issues such as RDS or ARDS.","label":"Low levels"}; {"text":"Could suggest overproduction of surfactant or other lung conditions that need further investigation.","label":"High levels"}

Pro-Surfactant B is a precursor protein that plays a crucial role in the synthesis of pulmonary surfactant, a mixture of lipids and proteins that coats the alveoli in the lungs and reduces surface tension, thereby preventing alveolar collapse during respiration.

Measurement of Pro-Surfactant B levels in the blood can provide valuable information about the lung's ability to produce surfactant, which is essential for normal lung function and gas exchange.

Abnormal levels of Pro-Surfactant B may indicate conditions such as respiratory distress syndrome (RDS) in newborns or acute respiratory distress syndrome (ARDS) in adults, making it a useful diagnostic tool in pulmonology.

Frequently asked questions

What is the normal range for Pro-Surfactant B?
The normal range for Pro-Surfactant B is 0–130 ng/mL.
Why is Pro-Surfactant B important in lung function?
Pro-Surfactant B is crucial for the production of pulmonary surfactant, which reduces surface tension in the lungs and prevents alveolar collapse, thus maintaining normal lung function.
  1. 1
    Pulmonary Surfactant Proteins and Lipids in Health and DiseaseSource
  2. 2
    Role of Surfactant in Respiratory Distress SyndromeSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

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If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy