POWER OF ATTORNEY

	Know all by these presents that the undersigned hereby
constitutes and appoints each of Laurie Churchill, Brian Keane, Ian
Macdonald and Bonnie McManus as the undersigned's true and lawful
attorney-in-fact to:
(1)	execute for and on behalf of the undersigned, in the
undersigned's capacity as a beneficial owner of Quanterix
Corporation (the "Company"), Forms 3, 4, and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934 and
the rules thereunder and Schedules 13D and 13G in accordance
with Section 13 of the Securities Exchange Act of 1934 and the
rules thereunder;
(2)	do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and
execute any such Form 3, 4, or 5 or Schedules 13D or 13G,
complete and execute any amendment or amendments thereto, and
timely file such form with the U.S. Securities and Exchange
Commission (the "SEC") and any securities exchange or similar
authority; and
(3)	take any other action of any type whatsoever in connection with
the foregoing which, in the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or legally
required by, the undersigned, it being understood that the
documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such
form and shall contain such terms and conditions as such
attorney-in-fact may approve in such attorney-in-fact's
discretion.
	The undersigned hereby grants to each attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all
intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes, shall lawfully do
or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned also ratifies
hereby any action previously taken by each attorney-in-fact that
would have been authorized by this power of attorney if it has been
in effect at the time such action was taken. The undersigned
acknowledges that each foregoing attorney-in-fact, in serving in such
capacity at the request of the undersigned, is not assuming, nor is
the Company assuming, any of the undersigned's responsibilities to
comply with Sections 13 and 16 of the Securities Exchange Act of
1934.
	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4, and 5
and Schedules 13D and 13G with respect to the undersigned's holdings
of and transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing delivered to
each foregoing attorney-in-fact.



	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 20th day of August, 2023.



/s/ William P. Donnelly


William P. Donnelly