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The postcoital test (PCT) evaluates the interaction between the sperm and the cervical mucus at a time near ovulation to determine if any incompatibility exists between them. Abnormal mucus may occur because of infections or surgery of clomiphene
citrate therapy. This test is a poor predictor of pregnancy
success, but may be useful to determine the need for intrauterine insemination
. If it is done too early before ovulation or too late after, the results may be falsely abnormal.