Baseline Laboratory and Imaging Investigations

The baseline infertility work-up is a focused set of tests that probe the prerequisites of conception: confirmation of ovulation, assessment of ovarian reserve, semen analysis, and imaging of the fallopian tubes and uterine cavity. Each test addresses a specific physiological requirement, so the combined results localise the most likely barrier to pregnancy.

Definition

Baseline infertility investigations are the standard first-line laboratory and imaging tests used to assess ovulation, ovarian reserve, semen quality, and the patency and structure of the fallopian tubes and uterine cavity in couples evaluated for infertility.

Scope

This topic surveys the standard first-line investigations and what each is intended to show: ovulation assessment, ovarian reserve markers, semen analysis, and tubal and uterine imaging. It is reference material on the purpose and interpretation of these tests and does not specify which tests an individual should undergo.

Core questions

• How is ovulation confirmed, and what do ovarian reserve markers measure?
• What does a semen analysis assess and how is it interpreted?
• How is tubal patency evaluated?
• How is the uterine cavity assessed for structural factors?

Key concepts

• Ovulation confirmation (e.g. mid-luteal progesterone)
• Ovarian reserve markers: anti-Mullerian hormone and antral follicle count
• Semen analysis
• Hysterosalpingography and tubal patency testing
• Pelvic and transvaginal ultrasound
• Saline infusion sonohysterography and hysteroscopy
• Test interpretation in the context of age and history

Mechanisms

Each baseline test interrogates one prerequisite of conception. Ovulation is confirmed indirectly, for example by a mid-luteal serum progesterone consistent with a recent ovulation. Ovarian reserve testing, principally anti-Mullerian hormone and antral follicle count, estimates the quantity of remaining follicles and helps predict ovarian response, though it does not reliably predict natural conception. Semen analysis quantifies sperm concentration, motility, and morphology to assess the male contribution. Tubal patency is assessed by hysterosalpingography or equivalent imaging, and the uterine cavity is evaluated by ultrasound, saline infusion sonohysterography, or hysteroscopy to detect structural factors that could impair implantation.

Clinical relevance

A focused baseline work-up identifies treatable factors and informs prognosis and counselling, while avoiding low-yield testing. As reference content it explains what each investigation measures and the limits of interpretation; it is not a prescription of tests or treatment for any individual.

Evidence & guidelines

The standard female work-up is set out in the ASRM committee opinion on diagnostic evaluation of the infertile female (Practice Committee, 2015), ovarian reserve testing in the ASRM committee opinion on testing and interpreting measures of ovarian reserve (Penzias et al., 2020), with comparative predictive performance of anti-Mullerian hormone and antral follicle count reviewed by Broer et al. (2010). Male testing is described in the ASRM committee opinion on diagnostic evaluation of the infertile male (Practice Committee, 2012), and an integrated pathway in NICE CG156 (2013, updated 2017).

History

The baseline work-up consolidated as endocrine assays, semen analysis, and tubal imaging matured during the twentieth century. The introduction of anti-Mullerian hormone and antral follicle count as ovarian reserve markers refined assessment of ovarian response, while committee opinions standardised which first-line tests are recommended (Penzias et al., 2020).

Debates

What can ovarian reserve testing actually predict?

Anti-Mullerian hormone and antral follicle count predict ovarian response to stimulation reasonably well, but they are poor predictors of natural conception and should not by themselves be used to deny or counsel against attempts at pregnancy.

Seminal works

• practice-committee-asrm-2015-female
• penzias-2020-ovarian-reserve
• broer-2010

Frequently asked questions

Does a low anti-Mullerian hormone mean a woman cannot conceive naturally?

No. Anti-Mullerian hormone reflects ovarian reserve and predicts response to ovarian stimulation, but it is a poor predictor of natural conception and should be interpreted alongside age and the rest of the evaluation.

Why is tubal patency tested?

Open fallopian tubes are required for sperm and egg to meet and for the embryo to reach the uterus, so confirming patency identifies a common and important cause of infertility.