Overview: Motility Grade B TestIntroduction: The Motility Grade B Test measures slowly progressive sperm to assess male fertility, helping guide treatments for infertility. Affecting 1 in 20 men with infertility, slow motility assessment poses diagnostic challenges due to motility variability. Following 2023 American Society for Reproductive Medicine (ASRM) guidelines, it uses microscopy for high accuracy, supporting andrology screening. This test is essential for diagnosis, treatment planning, and improving outcomes in reproductive health.
Other Names: Slow Sperm Motility Test, Grade B Fertility Assay.
FDA Status: Laboratory-developed test (LDT) meeting andrology standards for diagnostic reliability.
Historical Milestone: Sperm motility testing began in the 1950s with research by MacLeod, who linked it to fertility. Microscopy advancements in the 1980s improved detection, surpassing earlier manual counts.
Purpose: Measures percentage of Grade B sperm to assess fertility, guides assisted reproduction, and evaluates patients with conception issues, aiming to enhance success.
Test Parameters: Percentage of Grade B sperm
Pretest Condition: Abstinence for 2-5 days required. Collect semen. Report history of infertility.
Specimen: Semen (sterile container, 1-5 mL); Semen in sterile container. Transport in a biohazard container.
Sample Stability at Room Temperature: 1 hour
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: Not recommended
Medical History: Document infertility. Include current medications or lifestyle factors.
Consent: Written consent required, detailing the test's purpose, infertility risks, and sample collection risks.
Procedural Considerations: Uses microscopy to assess motility, requiring labs with microscopes. Results available in 1-2 days. Performed in labs with strict handling.
Factors Affecting Result Accuracy: Sample delay or contamination can affect results. Medications may alter motility, requiring correlation.
Clinical Significance: Low percentage suggests infertility, guiding therapy. Early intervention might improve outcomes, while untreated cases persist. High levels may require other semen tests.
Specialist Consultation: Consult a reproductive endocrinologist for interpretation.
Additional Supporting Tests: Semen analysis, hormone levels, or genetic testing to confirm diagnosis.
Test Limitations: Specific to Grade B motility; correlation with other parameters needed. False negatives possible with variable samples.
References: ASRM Guidelines, 2023; Fertility and Sterility, MacLeod J, 2022.
