Situation: A nurse at the infertility clinic of a tertiary hospital assesses couples who have been unable to conceive and teaches them about fertility tests. A 31-year-old wife has regular 30-day cycles, and her menstrual bleeding lasts 5 days. She was treated for pelvic inflammatory disease (PID) 2 years ago, and the physician has ordered hysterosalpingography (HSG) with a prophylactic antibiotic. She has no allergies. Which statement shows that she understood the nurse's teaching?

HSG is done after menstrual bleeding ends and before ovulation so that the cervix is not bleeding and an early pregnancy is not exposed. With a 30-day cycle, ovulation is around cycle day 16 (30 minus 14), so cycle day 9, after her 5 days of bleeding, falls in the safe window. A history of PID is not a contraindication; such clients may receive a prophylactic antibiotic as ordered and should report fever, severe pain, or foul discharge afterward.

Timing of HSG
Hysterosalpingography is scheduled after menstrual bleeding has completely stopped and before ovulation occurs. This timing protects the patient in two ways: the cervical canal is no longer actively bleeding, and there is no chance that an early pregnancy could be exposed to contrast or radiation. With a regular 30-day cycle, ovulation is estimated at approximately cycle day 16 (calculated as 30 minus 14). Since her menstrual bleeding lasts 5 days, cycle day 9 falls safely after bleeding has ended and well before the expected ovulation. The follicular phase, specifically the early-to-mid proliferative window, is the standard and safest time for HSG. ^[2]

Why not cycle day 3 or cycle day 17?
Cycle day 3 is too early because menstrual bleeding is often still ongoing or just tapering, which increases the risk of introducing bacteria into the uterine cavity and makes interpretation more difficult. Cycle day 17 is too late because ovulation has likely already occurred around day 16; performing HSG after ovulation risks disturbing a very early conception. Key point! The safe window is after menses and before ovulation, not simply any day when the patient feels ready.

History of PID and prophylactic antibiotics
A past pelvic inflammatory disease is not an absolute contraindication to HSG. Rather, it identifies a patient who may have tubal damage or adhesions, which is precisely why tubal patency assessment is indicated. Because prior PID can increase the risk of post-procedure infection, the physician may order a prophylactic antibiotic. Taking the prescribed antibiotic as ordered is an essential part of safe HSG preparation in this population. ^[1] The patient should also be taught to report fever, worsening pelvic pain, or foul-smelling vaginal discharge after the procedure.

Interpreting the answer choices

Option	Timing / Rationale	Correct?
1. Cycle day 3	Bleeding may still be present; higher infection risk and poor visualization	No
2. Cycle day 9 plus antibiotic	After menses, before ovulation; antibiotic taken as prescribed	Yes
3. Cycle day 17	After expected ovulation; risk of disturbing early pregnancy	No
4. Past infection means no test	PID is not a contraindication; prophylactic antibiotic is used instead	No

Clinical reasoning for the licensure exam
The question tests whether the examinee can calculate the ovulation window from a regular cycle and apply infection-prevention principles. Follicular phase timing is supported by standard practice, although direct comparative data on cycle-phase timing remain limited. ^[2] The presence of prior PID should prompt the nurse to reinforce the antibiotic order and post-procedure monitoring rather than cancel the test. Watch out! Do not confuse “history of PID” with “active pelvic infection.” Active infection is a contraindication; a treated past infection is not.