| Cover | May 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 9, 2022 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, Par Value $0.001 Per Share |
| Trading Symbol | LUCD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
