<prompt> Streptococcal GN is best diagnosed by -ASO titreAntiDNAseAntihyaluronidaseCulture  <response>: Ans. is b i.e., AntiDNAse; c Antihyaluronidase . Antistreptolysin - 0 ASO, anti DNAase B, antihyaluronidase, anti-NADase are elevated in more than 95 cases of PSGN Post streptococcal glomerulonephritis secondary to Pharyngitis. - API . Anti DNAase B and antihyaluronidase are elevated in more than 85 cases of PSGN following skin infection. - API . So PSGN can be diagnosed by anti DNAase B and antihyaluronidase because these antibodies are elevated after skin infection as well as after pharyngitis, while ASO is not elevated after skin infection. 