Final answer:
The ASO titer and anti-DNase B titer are tests used for documenting a past or recent streptococcal infection by measuring antibodies against toxins and enzymes produced by Group A streptococci.
Step-by-step explanation:
The two tests that are helpful for documenting previous streptococcal throat and skin infections are the ASO (antistreptolysin O) titer and anti-DNase B titer. The ASO titer is a measure of antibodies against the streptolysin O toxin produced by Group A streptococci, indicative of a recent or past infection. The anti-DNase B titer measures antibodies against the DNase B enzyme, which is also produced by Group A streptococci. Both of these titers rise during an infection and can be detected afterward, providing evidence of an immune response to the pathogen.
Tests such as CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate) are nonspecific markers of inflammation and would not be as useful for documenting streptococcal infections. IgG and IgM antibodies against specific streptococcal antigens might be useful, but this is not represented in the provided options. The Monospot test and heterophile antibody test are used to diagnose infectious mononucleosis, not streptococcal infections.