Under the national TB programme, for a PHC to be called a PHC-R, requisite is:
Microscopy
Microscopy plus radiology
Radiology
None of the above
Microscopy Facilities are available at all Primary health centres (PHC). Those Primary health centres (PHC) with additional Radiology facility were called PHC-R (R for Radiology) under the national tuberculsis (TB) programme. Ref: Park's Textbook of Preventive and Socaial Medicine By K.Park, 18th Edition, Page 335.