Investigating an infertile couple involves a systematic approach to identify the underlying causes. Here’s a general outline of the steps involved:

1. Medical History and Physical Examination: Both partners undergo a detailed medical history review and physical examination to identify any potential causes of infertility.
2. Semen Analysis: For the male partner, a semen analysis is performed to assess sperm count, motility, and morphology.
3. Ovulation Testing: For the female partner, ovulation can be tracked through basal body temperature charts, ovulation predictor kits, or blood tests to measure hormone levels (LH, FSH, progesterone).
4. Hysterosalpingography (HSG): An X-ray test that examines the inside of the uterus and fallopian tubes to check for blockages or abnormalities.
5. Transvaginal Ultrasound: This imaging test provides detailed images of the reproductive organs, including the uterus, ovaries, and fallopian tubes.
6. Hormonal Tests: Blood tests to measure hormone levels that affect ovulation and fertility (e.g., thyroid-stimulating hormone, prolactin, androgens).
7. Laparoscopy: A minimally invasive surgical procedure that allows direct visualization of the pelvic organs to identify any abnormalities or causes of infertility.
8. Genetic Testing: In some cases, genetic testing may be recommended to identify any genetic causes of infertility.

These investigations help in identifying the specific cause of infertility, which is crucial for determining the appropriate treatment plan. Consulting a healthcare provider specializing in reproductive medicine is essential for a comprehensive evaluation.