AFB Stain (ZN Stain)-Sputum Test for 1 parameters The AFB (Acid-Fast Bacilli) stain, also known as the Ziehl-Neelsen (ZN) stain, is a laboratory test used to detect the presence of acid-fast bacteria in sputum samples. Sputum No Fasting Required ₹220Free home sample Book Test Free home sample collection in 60 mins Reports within 3 Hours 10,00,000+Tests done TrustedDoctors 10,00,000+Certified Labs 10,00,000+Pickup-at-home Gallery-