<prompt> Nile blue sulphatase test in amniotic fluid is forLung maturityKidney maturityLiver maturitySkin maturity  <response>: Nile blue sulphate test - Place on a slide, one drop of amniotic fluid and add one drop of 0.1 Nile blue sulphate. Place on slide with a cover slip and observe under high power microscope. More than 50 foetal squamous cells becoming orange in colour is considered as an indicator of foetal lung maturity. Please note: NBS test is NOT for Skin maturity 