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Cover - shares
 9 Months Ended
Sep. 30, 2021
Nov. 18, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2021  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity File Number 001-40901  
Entity Registrant Name LUCID DIAGNOSTICS INC.  
Entity Central Index Key 0001799011  
Entity Tax Identification Number 82-5488042  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One One Grand Central Place  
Entity Address, Address Line Two Suite 4600  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10165  
City Area Code (212)  
Local Phone Number 949-4319  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol LUCD  
Security Exchange Name NASDAQ  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   36,808,647