EX-5.1 2 ea030175301ex5-1.htm OPINION OF HOGAN LOVELLS CADWALADER US LLP

Exhibit 5.1

Hogan Lovells Cadwalader US LLP Columbia Square 555 Thirteenth Street, NW Washington, DC 20004-1109 T +1 202 637 5600 F +1 202 637 5910 www.hlc.com

August 12, 2026

Board of Directors

Bluejay Diagnostics, Inc.

360 Massachusetts Avenue, Suite 203

Acton, MA 01720

To the addressee referred to above:

We are acting as counsel to Bluejay Diagnostics, Inc., a Delaware corporation (the “Company”), in connection with its registration statement on Form S-8 (the “Registration Statement”), filed with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Act”) relating to the proposed offering of up to 600,000 shares of the common stock, par value $0.0001 per share (the “Common Stock”) of the Company (the “Shares”), all of which shares of Common Stock are issuable pursuant to the Bluejay Diagnostics, Inc. 2021 Stock Plan, as amended (the “2021 Stock Plan”). This opinion letter is furnished to you at your request to enable you to fulfill the requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. § 229.601(b)(5), in connection with the Registration Statement.

For purposes of this opinion letter, we have examined copies of such agreements, instruments and documents as we have deemed an appropriate basis on which to render the opinions hereinafter expressed. In our examination of the aforesaid documents, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the accuracy and completeness of all documents submitted to us, the authenticity of all original documents, and the conformity to authentic original documents of all documents submitted to us as copies (including pdfs). As to all matters of fact, we have relied on the representations and statements of fact made in the documents so reviewed, and we have not independently established the facts so relied on. This opinion letter is given, and all statements herein are made, in the context of the foregoing.

This opinion letter is based as to matters of law solely on the Delaware General Corporation Law, as amended. We express no opinion herein as to any other statutes, rules or regulations.

Based upon, subject to and limited by the foregoing, we are of the opinion that following (i) effectiveness of the Registration Statement, (ii) issuance of the Shares pursuant to the terms of the 2021 Stock Plan, and (iii) receipt by the Company of the consideration for the Shares specified in the applicable resolutions of the Board of Directors or a duly authorized committee thereof and in accordance with the 2021 Stock Plan, the Shares will be validly issued, fully paid, and nonassessable.

Hogan Lovells Cadwalader US LLP is a limited liability partnership registered in the state of Delaware. “Hogan Lovells Cadwalader” is an international legal practice that includes Hogan Lovells Cadwalader International LLP and Hogan Lovells Cadwalader US LLP, with offices in: Alicante Amsterdam Baltimore Beijing Berlin Birmingham Boston Brussels Charlotte Colorado Springs Denver Dubai Dublin Dusseldorf Frankfurt Hamburg Hanoi Ho Chi Minh City Hong Kong Houston London Los Angeles Luxembourg Madrid Mexico City Miami Milan Minneapolis Monterrey Munich New York Northern Virginia Paris Philadelphia Riyadh Rome San Francisco São Paulo Shanghai Silicon Valley Singapore Tokyo Washington, D.C. Associated Offices: Jakarta Shanghai FTZ. Business Services Centers: Johannesburg Louisville. For more information see www.hlc.com.

Board of Directors Bluejay Diagnostics, Inc. August 12, 2026

This opinion letter has been prepared for use in connection with the Registration Statement. We assume no obligation to advise of any changes in the foregoing subsequent to the effective date of the Registration Statement.

We hereby consent to the filing of this opinion letter as Exhibit 5.1 to the Registration Statement. In giving this consent, we do not thereby admit that we are an “expert” within the meaning of the Act.

Very truly yours,

/s/ Hogan Lovells Cadwalader US LLP

HOGAN LOVELLS CADWALADER US LLP