Under RNTCP sputum sample slide with 3 AFB per oil immersion field will be repoed as:

Number of AFB Result repoed No AFB per 100 oil immersion fields 0 1-9 AFB per 100 oil immersion fields Scanty 10-99 AFB per 100 oil immersion fields + (1+) 1-10 AFB per oil immersion fields ++ (2+) >10 AFB per oil immersion fields +++ (3+) Ref: Park's textbook of Preventive and Social Medicine, 21stedition, page-169.