<prompt> Minimum level of HCG detected by radio immunoassay is :1.5-3.5 IUm10.5-1 IUm10.02-0.05 1Um10.001 IUm1  <response>: Ans. is d i.e. 0.001 1Um1 Pregnancy tests All the pregnancy tests used now days are immunological, which function on the principle of detecting HCG quantitatively or qualitatively, either in the urine or blood : 