was your blood test for the purpose of obtaining work visa, or a blood test to obtain nursing license in qatar? anyway, both procedures required blood test for nursing profession and other medical/paramedical employees.

there is nothing much to worry if it was done purposely to complete your visa procedure. usually, they wont inform you for the result unless there are abnormalities been traced in your blood, you can directly go to cid for finger print at least 3-5 working days from the date of your test.

but if it was done as a requirements for NHA licensing you may need to follow up the results at the place where you took the test.