- What the Embryology Laboratory Scientist Credential Actually Is
- Two Required Exams: Basic Knowledge and Embryology
- The Four Education Routes
- Thirty Procedures in Each of Six Categories
- Provisional Status: ELS-P(AAB)
- Mapping the 21 Curriculum Headings
- Fees, Sites, and Testing Mechanics
- Initial Validity and Annual Renewal
- Conflicting Information You May Encounter
- Sequencing Your Preparation by Domain
- Frequently Asked Questions
- ELS(AAB) is the Embryology Laboratory Scientist credential from the AAB Board of Registry (ABOR); it is not ALS(AAB).
- Candidates must pass both Basic Knowledge and Embryology; a failed exam alone is repeated.
- Eligibility requires thirty personally completed procedures in each of six ART categories, not thirty in total.
- One full-time experience year means 2,080 clock hours, completed within ten years before application.
What the Embryology Laboratory Scientist Credential Actually Is
The ELS(AAB) credential designates an Embryology Laboratory Scientist certified through the American Association of Bioanalysts (AAB) Board of Registry, known as ABOR. It is a practice-based certification for people who work in the human assisted reproductive technology (ART) laboratory, handling oocytes, sperm, and embryos. If you are new to the terminology, our explainers on what ELS(AAB) is and what ELS(AAB) stands for cover the basics.
One point deserves emphasis from the start: this credential is specific to embryology. It is distinct from the ALS(AAB) andrology credential and from AAB's director-level credentials. Because several unrelated certifications share similar abbreviations, always confirm that the information you are reading refers to the Embryology Laboratory Scientist pathway administered by ABOR. Everything in this article refers to that pathway only.
Two Required Exams: Basic Knowledge and Embryology
ABOR requires candidates to pass two examinations: Basic Knowledge and Embryology. Basic Knowledge is taken at the first examination sitting. You must pass both, and if you fail only one, you repeat only the one you failed. A passed exam does not need to be retaken.
Format and Testing Rules
ABOR describes the examinations as paper-and-pencil, multiple-choice tests that are scored by computer. Calculators and outside notes are restricted, so quantitative fluency (dilutions, concentrations, and similar calculations) should be practiced by hand.
What Is Not Publicly Known
Be cautious about any source that quotes a precise question count, time limit, or passing threshold for the combined ELS testing. Those ELS-specific values are not published in the materials ABOR makes publicly available, and unpublished topic weights remain unknown until you are approved as a candidate. ABOR's FAQ confirms that the examination outline, including approximate topic percentages, and the reference-book list are supplied after candidacy approval. For a deeper look at what is and is not known about scoring, see our discussion of the ELS(AAB) passing score and pass rate.
The Four Education Routes
ABOR recognizes four qualifying education pathways. All four additionally require the documented procedures and the embryology experience described in the next section.
| Route | Education Requirement |
|---|---|
| 1 | Accredited doctorate, master's, or bachelor's degree (or equivalent) in chemical, physical, biological, or clinical laboratory science or medical technology. Degrees outside CLS/MT need six semester hours of chemistry, six of biology, and twelve combined in chemistry, biology, or medical laboratory technology. |
| 2 | Accredited associate or associate-of-applied-science degree in clinical laboratory science or medical technology. |
| 3 | Sixty accredited semester hours (or equivalent), including twenty-four hours of medical laboratory technology in chemistry, hematology, immunohematology, immunology, and microbiology, or twenty-four science hours with the same 6/6/12 distribution. |
| 4 | Technologist qualification or eligibility under revised Medicare/CLIA '67, 42 CFR 493.1433 (published March 14, 1990, 55 FR 9538), including HHS/HEW Proficiency Examination passers and those with ten years of full-time experience before January 1, 1968. |
For a fuller walkthrough of prerequisites, read our guide to ELS(AAB) requirements and how to qualify.
Thirty Procedures in Each of Six Categories
This is the requirement candidates most often misread. Under ABOR General Regulations section 15, you must have personally completed thirty human ART procedures in each of six categories. That is not thirty procedures in total. The procedures also need not involve the same cycles or patients.
The Six Procedure Categories
Each category needs its own documented thirty:
- Oocyte isolation from follicular aspirations
- Sperm preparation
- ICSI cycles
- Fertilization documentation
- Laboratory preparation for embryo transfer
- Egg/embryo cryopreservation
"Embryo transfer preparation" refers to the laboratory portion of transfer performed under your laboratory's standard operating procedures, not the clinical transfer itself.
The Experience Clock
In addition to the procedure counts, you need one year of acceptable full-time embryology experience within the ten years before your application. ABOR's FAQ defines one full-time year as 2,080 clock hours. Part-time or rotating staff should track hours carefully, because the total, not the calendar span, determines whether the year is satisfied.
Provisional Status: ELS-P(AAB)
Candidates who meet the education requirement but lack the full procedure or experience requirements may receive a provisional credential, ELS-P(AAB), after passing the examinations. Full certification then requires documented qualifying procedures and experience plus board approval. According to ABOR's Provisional Status page, the experience must fall within the ten years before the request to remove provisional status.
This route suits early-career embryologists who can prepare for the exams while still accumulating procedure counts. It lets you demonstrate knowledge competence sooner while your procedural record catches up. To weigh whether the investment makes sense for your situation, see whether the ELS(AAB) certification is worth it.
Mapping the 21 Curriculum Headings
The 21 headings below reflect the public subjects listed on AAB's Reproductive Biology Laboratory Courses page (2026 course list, recorded September 2025). Treat them as a recommended curriculum, not an official exam blueprint: they are unweighted and nonexhaustive, and they do not establish that the exam has 21 official domains or covers every topic listed. Our complete domains guide goes deeper on each area.
Core Embryology Bench Skills
Culture Techniques; Gamete Preparation; Micromanipulation
These headings cover the daily work of the IVF laboratory.
- Culture media, incubation environment, and conditions that influence embryo development
- Preparing sperm and oocytes for insemination or injection
- Micromanipulation principles underlying ICSI and related techniques
Cryopreservation Theory and Practice
Cryobiology underpins one of the six required procedure categories.
- Principles of freezing and vitrification, including cryoprotectant behavior
- Storage, tracking, and risk management for cryopreserved material
Fertilization and Early Embryonic Development; Embryo Selection and Contemporary Embryo Transfer Art and Science
These headings connect laboratory observation to clinical outcome.
- Fertilization events and early cleavage-stage development
- Assessing embryos and the laboratory's role in transfer
Reproductive Physiology and Genetics
Female Physiology; Ovulation Induction and Female Infertility
Understanding the cycle and stimulation protocols helps you interpret what arrives in the lab.
- Female reproductive function and hormonal regulation
- Ovulation induction concepts and causes of female infertility
Male Reproductive Function (three headings); Male Contribution to the Embryo and Offspring; Semen Analysis and Advanced Diagnostics
Six curriculum headings touch the male side, which is why andrology knowledge remains relevant to embryologists.
- Development of the male genitourinary tract
- Spermatogenesis and male reproductive tract biology
- Male infertility, semen analysis, and advanced diagnostics
- Paternal contribution to the embryo and offspring
Reproductive Genetics; Preimplantation Genetic Testing
Genetic concepts connect embryo biopsy and testing to broader inheritance principles.
- Core reproductive genetics
- Preimplantation genetic testing in the context of ART
Regulation, Safety, and Management
CLIA '88; FDA-HCTP Regulations and the Fertility Clinic Success Rate Certification Act
Regulatory literacy is part of the curriculum, not an afterthought.
- Laboratory regulation under CLIA '88
- FDA human cell, tissue, and tissue-based product requirements
- Success-rate reporting requirements
Laboratory Safety, OSHA, and Disaster Preparedness; Total Quality Management in the IVF Laboratory; General Laboratory Management; Financial Laboratory Management and Employment Law
These headings reflect supervisor-oriented review content.
- Safety practices and emergency planning
- Quality management systems for the IVF lab
- Laboratory operations, finance, and employment considerations
Fees, Sites, and Testing Mechanics
ABOR's fee schedule explicitly includes ELS. The figures below come from the ABOR Application and Examination Fees page and are separate from any review-course price.
| Item | Amount |
|---|---|
| Initial application | $115 |
| First examination | $105 |
| Each additional examination taken the same day (maximum three exams) | $65 |
| ABOR proctor fee | $35 per person per day |
If you use a college or university testing center instead of an ABOR proctor, that center's proctor charges are paid separately. ABOR provides examination sites in California and Florida; approved college or university testing centers are the stated alternative elsewhere. Because review-course prices, contact hours, recording lengths, and 90-day individual-course access are learning-product terms rather than exam fees, do not confuse them with certification costs. Our certification cost breakdown lays out how to budget, and our exam dates guide addresses scheduling.
Initial Validity and Annual Renewal
Under General Regulations section 3, initial certification is valid through December 31 of the award year. After that, ABOR's Maintain Certification page specifies an annual renewal fee of $115 and no ABOR continuing-education requirement. State licensing obligations are separate and may impose their own requirements, so check your state's rules independently.
Conflicting Information You May Encounter
If you research this credential broadly, you may find sources that disagree with current ABOR pages. Two are worth flagging:
- Older newsletter language: An April 23, 2020 ABOR newsletter paragraph about the ELS pathway names ALS/Andrology testing. The current ELS Qualifications and Examinations pages govern, and they require Basic Knowledge plus Embryology.
- Third-party occupational listings: O*NET's credential entry lists a three-year renewal cycle and more than two years of work experience. The current issuer instead specifies annual renewal and the one-year (2,080-hour) experience requirement described above.
Key Takeaway
When any secondary source conflicts with ABOR's current Qualifications, Examinations, and Renew Certification pages, trust the issuer. Verify details directly with ABOR before committing money or planning your timeline.
Sequencing Your Preparation by Domain
Because your official topic percentages arrive only after candidacy approval, a sensible plan front-loads foundations and revisits weighted areas once you have the outline. The sequence below is one way to organize the recommended curriculum headings; adjust it once you see your candidate-approved materials. For a broader plan, see our ELS(AAB) study guide, and for a quick refresher near test day, the cheat sheet.
Reproductive Physiology Foundations
- Female physiology, ovulation induction, and the male reproductive headings, since later embryology topics build on them
- Spermatogenesis and tract biology alongside semen analysis
Bench Technique Domains
- Gamete preparation, micromanipulation, and culture techniques
- Fertilization, early development, and embryo selection and transfer
- Cryopreservation theory, paired with your own procedure log
Genetics, Regulation, and Quality
- Reproductive genetics and preimplantation genetic testing
- CLIA '88, FDA-HCTP, success-rate certification, OSHA, and quality management
Basic Knowledge and Integration
- Review the PER Basic Knowledge Manual (2020 edition) listed in ABOR study materials
- Practice calculations by hand, since calculators are restricted
Because Basic Knowledge is taken at the first sitting, do not leave its review until the end. Plan time for it alongside your embryology topics. ABOR's study materials page also identifies 2025-edition combined Andrology and Embryology review materials containing relevant ELS content.
If you are weighing how demanding the preparation will be, our difficulty guide discusses what to expect, and the pages on earnings and ELS(AAB) jobs cover career considerations in IVF laboratories. You can also explore the full ELS(AAB) training overview.
Frequently Asked Questions
You must pass both Basic Knowledge and Embryology to earn the credential, with Basic Knowledge taken at the first examination sitting. If you fail only one, you repeat only the failed exam.
No. ABOR requires thirty personally completed human ART procedures in each of six categories: oocyte isolation, sperm preparation, ICSI, fertilization documentation, laboratory preparation for embryo transfer, and cryopreservation. The procedures need not involve the same cycles or patients.
Education-eligible candidates who lack the procedure or experience requirements may receive provisional ELS-P(AAB) after passing. Full certification requires documented qualifying procedures and experience plus board approval.
ABOR lists a $115 initial application fee, $105 for the first examination, and $65 for each additional exam taken the same day (maximum three), plus a $35 per person per day ABOR proctor fee. College or university testing-center proctor charges are paid separately.
Initial certification is valid through December 31 of the award year. ABOR specifies annual renewal at $115 with no ABOR continuing-education requirement, though state licensing obligations are separate. For more background, see our overview of ELS(AAB) certification.