ALS Exam Domains 2026: Complete Guide to All 2 Content Areas

ALS Exam Structure Overview

The Andrology Laboratory Scientist credential, issued as ALS(AAB) by the AAB Board of Registry (ABOR), is built around just two content areas. That's a deliberately narrow structure compared to many multi-domain laboratory certifications, and it means candidates can't spread thin preparation across a dozen subtopics - every study hour needs to land on one of two exams: the Basic Knowledge Examination or the Andrology Examination.

Both examinations follow the same format: 70 multiple-choice questions administered in a 90-minute window. Calculators and outside notes are not permitted in either sitting, so recall speed and comfort with mental estimation matter more than they might on an open-reference exam. A score of 60% is required on each examination independently - passing one does not offset a lower score on the other.

If you're still getting oriented to the credential itself before diving into content, our companion pieces on What Is ALS? and ALS Certification lay out the bigger picture, while this guide focuses specifically on what's tested inside each domain.

Domain 1: Basic Knowledge Examination

The Basic Knowledge Examination covers the foundational science and laboratory principles that underpin clinical laboratory work broadly, before the Andrology Examination narrows into specialty content. This is the exam every candidate must sit first - it is required at your initial testing sitting and cannot be postponed to a later date.

Because this exam is mandatory at the outset, candidates sometimes underestimate how much dedicated review it deserves - treating it as a formality before the "real" specialty exam. That's a mistake worth avoiding. A failed Basic Knowledge attempt still counts against your testing history and fee outlay, so it deserves the same structured preparation as the Andrology Examination. For a broader look at how the two exams interact in terms of overall difficulty, see How Hard Is the ALS Exam? Complete Difficulty Guide 2026.

Domain 2: Andrology Examination

The Andrology Examination is the specialty content area - the part of the credential that distinguishes an Andrology Laboratory Scientist from a general laboratory professional. It carries the same format as Basic Knowledge: 70 questions, 90 minutes, no calculators, no outside notes, and a 60% passing threshold applied separately from the other exam.

Because this exam is timed identically to Basic Knowledge but tests narrower, deeper material, many candidates find pacing feels different between the two sittings even though the clock and question count are the same. Building familiarity with the exact question style ahead of time - through structured practice rather than passive review - tends to matter more here. Our ALS Study Guide 2026: How to Pass on Your First Attempt breaks down preparation strategies specifically for this domain.

Registration, Sitting Order, and Fees

Understanding the mechanics of how the two exams are scheduled and paid for is just as important as knowing their content, because a mistake in sequencing can cost you time and money. Basic Knowledge must be your first exam. The Andrology Examination can follow on the same day or be scheduled for a later date, but many candidates choose to sit both back-to-back since same-day testing is explicitly supported by the fee structure.

Note that college or university proctor fees, when applicable instead of an AAB proctor, are billed separately from this total. For a complete breakdown of every fee scenario and how they add up depending on your testing path, read ALS Certification Cost 2026: Complete Pricing Breakdown.

Eligibility to sit for either exam runs through one of four education routes combined with either an approved clinical laboratory training program or at least three months of full-time high-complexity andrology laboratory training or experience completed within the preceding 10 years. Candidates who satisfy the education requirement before finishing the training component may qualify for ALS-P(AAB) provisional status in the meantime. Full detail on each pathway is covered in ALS Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Who Hires ALS-Certified Professionals

Because the credential is anchored to two specific domains - general laboratory foundations and andrology specialty practice - employers hiring for andrology laboratory roles look for candidates who can demonstrate both. That typically means fertility clinics, reproductive endocrinology practices, hospital-based andrology labs, and reference laboratories that process semen analysis and related specialty testing.

Hiring managers in these settings often use the credential as a shorthand signal that a candidate has passed standardized testing on both foundational lab science and the technical specifics of andrology work, rather than relying solely on years of on-the-job experience. If you're evaluating whether this career path and its associated testing investment make sense for you, Is the ALS Certification Worth It? Complete ROI Analysis 2026 and ALS Salary Guide 2026: Complete Earnings Analysis are useful next reads, and ALS Jobs covers the kinds of postings that reference this credential directly.

Mapping a Study Timeline to the Two Domains

With only two domains, the biggest planning decision isn't how many topics to cover - it's how to sequence and pace review between Basic Knowledge and Andrology content so neither gets shortchanged before test day. A simple approach: dedicate the earlier portion of your prep window to Basic Knowledge foundations, then shift emphasis toward Andrology-specific material as your sitting date approaches, since that's the content most likely to feel unfamiliar if you're coming from a general lab background.

Whichever schedule you build, practicing under real time pressure matters more here than with open-book exams, since neither the Basic Knowledge nor the Andrology Examination allows outside references. Working through timed questions on our practice test platform before test day helps you calibrate pacing so 90 minutes for 70 questions feels routine rather than rushed. For a quick pre-exam refresher once you've completed full study cycles, the ALS Cheat Sheet 2026: One-Page Review of Must-Know Facts condenses the highest-value facts from both domains into a single reference.

It's also worth confirming exact scoring expectations before you sit down, since 60% on each exam is a firm, independent threshold rather than an average across both. ALS Passing Score 2026: Exactly What You Need to Pass walks through what that means in practice, and ALS Pass Rate 2026: What the Data Shows puts the requirement in broader context.

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