What are the reasons why chest xrays result is blurry, i mean the immigration medical they told my friend she is under sputum test cuz her xrays blury?

Suspected infection: From what you described there was a irregularity in your friend's x-ray and the authorities want to exclude infection, especially tuberculosis. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine.

Checking for TB: The U.S. immigration exam requires making sure that a patient does not have active tuberculosis (TB). If a chest X-ray is suspicious for TB (or has poor image quality), the patient might undergo further testing to see if an infection is present.