A 35 year female presented with complaints of infeility. She has previous history of PID. Preliminary investigations like USG showed normal organs and hormone levels were also normal. What is the next best investigation?
**Core Concept**
The patient's history of pelvic inflammatory disease (PID) and current complaint of infertility may be related to tubal damage or scarring, which can affect fertility. A thorough evaluation of the fallopian tubes is essential in this case.
**Why the Correct Answer is Right**
Hysterosalpingogram (HSG) is a diagnostic imaging test that evaluates the shape and patency of the fallopian tubes. It involves injecting a contrast agent through the cervix, which fills the uterine cavity and fallopian tubes. The X-ray images obtained can help identify any blockages, scarring, or other abnormalities in the tubes. This is particularly useful in patients with a history of PID, as it can help determine if the tubes are patent or not.
**Why Each Wrong Option is Incorrect**
**Option A:** Laparoscopy - While laparoscopy is a valuable tool for evaluating pelvic anatomy and diagnosing conditions like endometriosis, it is not the next best investigation in this case, as HSG provides a more direct assessment of the fallopian tubes.
**Option B:** Semen analysis - Semen analysis is essential for evaluating male fertility, but it is not relevant in this case, as the patient's partner's fertility status is not mentioned.
**Option C:** Endometrial biopsy - Endometrial biopsy is useful for evaluating endometrial pathology, but it is not the next best investigation in this case, as the patient's hormone levels are normal and the focus is on evaluating the fallopian tubes.
**Option D:** CT scan of the pelvis - CT scan of the pelvis may be useful in evaluating pelvic pathology, but it is not the next best investigation in this case, as HSG provides more specific information about the fallopian tubes.
**Clinical Pearl / High-Yield Fact**
In patients with a history of PID, a normal HSG result does not rule out the possibility of tubal damage or scarring, as some patients may have patent tubes with significant scarring or adhesions.
**Correct Answer:** C.