The correct verb

[smp917]

The EKG, along with the CT scan, was negative or
The EKG, along with the CT scan, were negative.

[Lucky6]

The EKG, along with the CT scan, was negative.


The EKG was negative.


The EKG and the CT scan were negative.

[smp917]

which one is it was or were?

[Casiopea]

which one is it was or were?

Welcome, smp917.


From Subject-Verb Agreement

Phrases such as together with, as well as, and along with are not the same as and. The phrase introduced by as well as or along with will modify the earlier word (mayor in this case), but it does not compound the subjects (as the word and would do).

• The mayor as well as his brothers is going to prison.
• The mayor and his brothers are going to jail.

From Subject and Verb Agreement | Grammar Rules

Sometimes the subject is separated from the verb by words such as along with, as well as, besides, or not. Ignore these expressions when determining whether to use a singular or plural verb.

Examples
The politician, along with the newsmen, is expected shortly.
Excitement, as well as nervousness, is the cause of her shaking.

Does that help?