Which statement best describes the interpretation when Rh typing is deemed invalid?

Which statement best describes the interpretation when Rh typing is deemed invalid?

• A. Rh positive
• B. Rh negative
• C. Invalid Rh typing
• D. Rh negative with weak D

Answer: (C)

When Rh typing is invalid, you cannot determine the presence or absence of the D antigen from that result. An invalid outcome means the test didn't yield a reliable pattern due to technical issues (such as sample quality, interference, or reagent problems). The correct course is to repeat the Rh typing with a new sample or use an alternative method, so a true Rh status can be assigned. In other words, the interpretation is that the Rh typing is invalid, not positive, negative, or weak D.

When Rh typing is invalid, you cannot determine the presence or absence of the D antigen from that result. An invalid outcome means the test didn't yield a reliable pattern due to technical issues (such as sample quality, interference, or reagent problems). The correct course is to repeat the Rh typing with a new sample or use an alternative method, so a true Rh status can be assigned. In other words, the interpretation is that the Rh typing is invalid, not positive, negative, or weak D.