This type of email could worry anyone who receives it. Those who have recently had a blood test may fall for this scam and click the email attachment, infecting their PC with malware that may steal data or be used to launch other scams.
If you receive such an email delete it. It is always advisable not to click the attachment on any email unless you know exactly what that attachment is. Even attachments from friends may contain viruses, if their computer has been infected.