can taking beta blockers effect the results of a blood test for thyroid function??

Answer 1

Yes they increase thyroid levels and can effect result.
Hormone Disorders (AGS Foundation for Health in Aging)
... to make sure that levels are consistently high. Thyroid levels can be temporarily increased by certain drugs (eg,beta-blockers or high doses of corticosteroids) or conditions (eg, fasting or hepatitis). A specialized imaging test can be used to confirm hyperthyroidism .
www.healthinaging.org/agingintheknow/chapters_ch_trial.asp?ch=48