v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 18, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Registrant Name PROFUSA, INC.  
Entity Central Index Key 0001859807  
Entity Tax Identification Number 86-3437271  
Entity Current Reporting Status Yes  
Entity File Number 001-41177  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 626 Bancroft Way  
Entity Address, Address Line Two Suite A  
Entity Address, City or Town Berkeley  
Entity Address, Country CA  
Entity Address, Postal Zip Code 94710  
City Area Code (925)  
Local Phone Number 997-6925  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol PFSA  
Security Exchange Name NASDAQ  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   605,647