A medical laboratory technician (MLT) license is the state-level authorization to work as a laboratory technician in clinical and diagnostic settings. It's separate from national certification — though in most states, earning national certification is required before the state will issue a license. The two are connected, but they're not the same thing.
National certification comes from organizations like ASCP (American Society for Clinical Pathology), AMT (American Medical Technologists), or AAB (American Association of Bioanalysts). State licensure is issued by your state's Department of Health or equivalent regulatory body. Some states require both; others accept national certification alone as sufficient to practice.
The specific requirements for an MLT license vary considerably by state. Some have detailed licensure processes with their own applications and fees; others have no state licensure requirement at all, relying entirely on national certification standards. Knowing what your state requires is the first step.
Not all states license medical laboratory technicians. The states with the most defined MLT licensure requirements include:
States without formal MLT licensure requirements (including Texas, Ohio, and many others) still typically require that laboratory workers meet CLIA standards — meaning labs must employ personnel who meet education and training requirements even if the state doesn't issue individual licenses. In these states, national certification is the de facto standard for employment even without a formal license mandate.
The standard educational path to MLT certification and licensure is an associate degree in medical laboratory technology or clinical laboratory science from a program accredited by NAACLS (National Accrediting Agency for Clinical Laboratory Sciences).
NAACLS-accredited associate programs are typically two years in length and include both classroom instruction and supervised clinical laboratory experience. Clinical rotations at affiliated hospitals or reference labs are usually built into the curriculum — you can't complete the program without hands-on laboratory training.
Some candidates enter with a bachelor's degree in biology, chemistry, or another natural science and complete an MLT certification pathway through a formal training program (sometimes called a "categorical" or "transitional" program). This route is available through some hospital-based programs and is accepted by ASCP and other certification bodies, though it requires documentation of sufficient clinical training hours.
ASCP's pathway for candidates with non-MLT degrees requires:
The specific coursework and clinical hour requirements are detailed on ASCP's website and vary by certification pathway. Always verify current requirements directly with the certifying body and your state health department before beginning a program.
The medical laboratory technician certification resources available on this site include practice questions covering the major lab disciplines that appear on the ASCP MLT exam and similar national certification tests.
The ASCP MLT (Medical Laboratory Technician) certification exam is the most widely recognized national credential and the most commonly used examination pathway for state licensure. It's a computer-based test with 100 questions administered at Pearson VUE testing centers.
The exam covers six major content areas:
The passing score is set using a scaled scoring methodology — ASCP doesn't publish a single numeric cutoff, but candidates typically need roughly 70–75% correct to pass. Questions are a mix of straightforward knowledge recall and case-based scenario questions requiring application of laboratory procedures to clinical situations.
Once you've passed your national certification exam, the state licensure application process typically involves:
In most states, you can work as an MLT in a supervised capacity while your licensure application is pending, as long as your national certification is active. Check your state's specific rules on provisional practice before assuming this applies to you.
Both national certification and state licensure require ongoing maintenance. For ASCP certification, recertification is required every three years through completion of continuing education (CE) credits. The CE requirement is 36 credits over three years, with credits available through ASCP's online education platform, approved conferences, and journal-based learning.
State license renewal timelines and requirements vary. Most states require renewal every one or two years, with documentation that your national certification remains active and, in some cases, completion of state-specific CE requirements.
Keep track of your renewal deadlines separately for certification and licensure — they don't always align. A lapsed national certification can trigger a problem with your state license renewal, so setting calendar reminders well in advance of both expiration dates prevents avoidable gaps in your credentials.
For candidates preparing for the certification exam, the medical laboratory technician salary and career information available on this site provides context on what the credential unlocks — both the earning potential and the practice settings where MLTs work.
Once you're licensed and certified, the work settings available to you are broader than many candidates realize going in. Hospital laboratories are the most obvious path, but MLTs also work in:
Starting salaries for MLTs typically run $45,000–$60,000 depending on geography and setting, with hospital and reference lab positions often paying more than physician office settings. States with high cost of living (California, New York) have higher absolute salaries but the net difference when adjusted for living costs is variable.
Many MLTs eventually pursue bachelor's completion programs to advance to MLS/MT status, which opens supervisory and specialty positions with higher earning potential. Several universities offer online bachelor's completion programs specifically designed for practicing MLTs — you can typically complete the degree while working full time in 18–24 months.
The MLT credential is a solid entry point into laboratory medicine — strong job security, consistent demand, and a clear advancement pathway for those who want to grow. The medical laboratory technician field is one where your initial certification investment pays returns for decades.