D I A G N O S T I C S

Psychological Assessment Services

Psychological assessment can provide clarity when attention, learning, development, emotions, behavior, personality, or cognitive concerns are affecting daily life. Each service is selected and individualized based on the referral question, age, history, and clinical needs of the person being evaluated. These services are available for patients ages 6 and older.

Full Evaluation Package Services and Fees

  • ADHD Evaluation

    $2,000

    Clarify concerns with attention, organization, activity level, and impulsivity

  • Autism Evaluation

    $2,000

    Explore social communication, sensory experiences, routines, and support needs

  • ADHD + Autism Evaluation

    $2,500

    Assess both together to understand overlapping concerns and guide individualized support.

  • Mental Health and Personality Evaluation

    $1,800

    Clarify mood, anxiety, trauma, behavior, obsessive symptoms, and personality patterns

  • Giftedness and Cognitive Strengths Evaluation

    $2,000

    Explore intellectual giftedness, cognitive strengths, and educational needs. Ages 6–16.

  • Complex Diagnostic Evaluation

    $3,000

    Multiple interacting concerns, complicated histories, or substantial records

Evaluation Package Details

  • Designed for: Children, adolescents, and adults with concerns involving attention, organization, working memory, task completion, activity level, or impulsivity.

    This evaluation may include:

    • A detailed clinical and developmental interview

    • Standardized ADHD measures selected for the person's age, which may include parent, teacher, partner, or self-report forms

    • Assessment of functioning across settings rather than reliance on a single questionnaire

    • Measures of adaptive, emotional, behavioral, or cognitive functioning when needed for differential diagnosis

    • Consideration of other explanations for attention problems, including anxiety, mood, trauma, sleep, learning, developmental, and medical factors

    • An integrated report, recommendations, feedback, and an accommodation letter upon request when supported

    Important: This evaluation focuses on ADHD and related differential diagnosis. A comprehensive learning-disorder or autism evaluation may require a different package.

  • Designed for: Children, adolescents, and adults with questions about social communication, sensory experiences, routines, restricted interests, masking, developmental differences, or support needs.

    This evaluation may include:

    • A detailed developmental and diagnostic interview

    • Direct, autism-specific assessment and clinical observation

    • Standardized measures of autism-related traits and social communication

    • Assessment of adaptive functioning and day-to-day support needs

    • Brief cognitive assessment when it will improve diagnostic interpretation

    • Collateral information and review of early developmental history when available

    • Consideration of ADHD, anxiety, trauma, personality, intellectual, and other conditions that can overlap with autism

    • An integrated report, recommendations, feedback, and an accommodation letter upon request when supported

  • Designed for: Individuals who may have ADHD, autism, or both and need the overlap evaluated within one integrated process.

    This evaluation may include:

    • The core components of both the ADHD and autism evaluations without unnecessary duplication

    • A detailed developmental and diagnostic interview

    • Direct autism-specific assessment and observation

    • ADHD, autism, adaptive-functioning, and cross-setting rating measures

    • Cognitive, emotional, or behavioral measures when clinically indicated

    • Collateral information and relevant records

    • An integrated explanation of which concerns are best accounted for by ADHD, autism, both conditions, or another factor

    • A written report, individualized recommendations, feedback, and an accommodation letter upon request when supported

  • Designed for: Individuals seeking diagnostic clarification involving mood, anxiety, trauma, obsessive thoughts or behaviors, emotional regulation, behavior, relationship patterns, or longstanding personality concerns.

    This evaluation may include:

    • A comprehensive clinical interview and diagnostic history

    • Broad emotional and behavioral assessment

    • Trauma, anxiety, mood, obsessive-compulsive, or other targeted measures as indicated

    • Personality assessment when developmentally and clinically appropriate

    • Review of relevant treatment records and collateral information when helpful

    • Differential diagnosis and treatment-planning recommendations

    • A written report, feedback appointment, and an accommodation letter upon request when supported

    Important: The assessment battery differs by age. Formal personality measures are used only when developmentally appropriate.

  • Designed for: Children and adolescents ages 6 through 16 whose families want to understand intellectual giftedness, cognitive strengths, and educational needs.

    This evaluation may include:

    • A parent interview and review of relevant educational history

    • Comprehensive, individually administered cognitive testing

    • Additional measures when needed to understand the student's learning profile or twice-exceptional concerns

    • A written explanation of cognitive strengths and relative weaknesses

    • Educational recommendations, feedback, and an accommodation letter upon request when supported

    Important: School districts and gifted programs set their own eligibility rules. Families should confirm program-specific requirements before scheduling; an independent evaluation does not guarantee admission or eligibility.

  • Designed for: Individuals with multiple interacting developmental, emotional, behavioral, personality, or cognitive concerns; complicated histories; substantial records; previous conflicting diagnoses; or significant diagnostic uncertainty.

    This evaluation may include:

    • An extended clinical and developmental interview

    • Detailed review of relevant medical, psychological, educational, and treatment records

    • A broad, individualized battery selected from cognitive, adaptive, developmental, emotional, behavioral, personality, attention, and autism-related measures

    • Collateral consultation or care coordination when clinically necessary and authorized

    • Extensive integration of findings across multiple possible diagnoses

    • A comprehensive written report, individualized recommendations, feedback, and an accommodation letter upon request when supported

    Important: This service is not a comprehensive neuropsychological evaluation. Concerns involving progressive cognitive decline, active complex neurological disease, significant regression, severe traumatic brain injury, or detailed attribution of cognitive symptoms to a neurological condition may require referral to a neuropsychologist, neurologist, or another specialist.

What Every Full Evaluation Includes

Every full evaluation package is individualized. The exact measures used may vary because a valid evaluation should answer the referral question, not force every person through an identical battery. Full evaluations include:

  • A clinical/developmental interview lasting at least 60 minutes

  • An individualized assessment plan based on the referral question and history

  • Review of relevant records and questionnaires

  • Collateral information from parents, teachers, partners, caregivers, or other providers when appropriate and authorized

  • Approximately three hours of in-person testing in many cases, with additional or shorter testing when clinically indicated

  • Scoring, interpretation, and integration of all available information

  • A written report explaining findings, diagnoses when supported, and practical recommendations

  • A feedback session, available in person or by telehealth

  • An accommodations letter upon request when the evaluation findings clinically support the requested accommodations

The goal is to provide the completed report within one week after testing is finished and all required questionnaires, collateral information, and records have been received. Complex cases may require additional time.

About Dr. Grimmer

Dr. Sarah Grimmer is a licensed clinical psychologist with extensive training in psychological assessment, differential diagnosis, neuropsychology, trauma psychology, and health psychology. She earned her bachelor’s degree in psychology from Texas Christian University and her master’s and doctoral degrees in clinical psychology from Fielding Graduate University’s APA-accredited program.

Dr. Grimmer has trained in several medical and psychological settings familiar to North Texas families, including John Peter Smith Hospital, JPS Family Medicine Clinic, the University of Texas Health Science Center at Tyler, and the Center for Psychological Services. Her experience includes comprehensive evaluations for children and adults with ADHD, autism, intellectual and learning differences, mood and anxiety disorders, personality concerns, trauma-related symptoms, and cognitive or neuropsychological difficulties. She has also worked in primary care, inpatient medical and psychiatric settings, and specialty health services, giving her a broad perspective on how psychological, developmental, medical, and environmental factors can overlap.

Her approach to assessment emphasizes careful differential diagnosis rather than simply matching symptoms to a label. She works to understand the whole person, integrate information from multiple sources, and provide clear, practical recommendations that individuals and families can actually use.

Dr. Grimmer is also a published researcher whose work has focused on physician and family well-being, burnout, and secondary emotional trauma. She lives in the Fort Worth area with her husband and their three children. As both a psychologist and a parent, she understands how important it is for families to feel heard, receive straightforward answers, and leave an evaluation with a meaningful path forward.

Focused Screening and Consultation Services

  • Dyslexia Screening

    $400

    Focused screening for reading-related concerns and recommended next steps

  • Memory and Thinking Screening

    $400

    Brief adult screening of memory, attention, language, and other thinking skills to identify possible cognitive concerns and determine whether medical or comprehensive neuropsychological follow-up may be appropriate

  • Concussion and TBI Screening Consultation

    $400

    Brief screening of symptoms and cognitive concerns to determine whether a full neuropsychological evaluation is recommended

Screening services are narrower than full diagnostic evaluations. Each includes a focused 30-minute intake, targeted screening, scoring and review, a results discussion, and a brief written summary. Screening can identify risk and guide next steps, but it may not confirm or rule out a diagnosis.

  • Designed for: Children, adolescents, or adults with concerns about reading accuracy, fluency, spelling, or other indicators of dyslexia.

    This evaluation may include:

    • A focused interview and review of relevant educational history

    • Targeted measures of reading-related skills and dyslexia risk

    • A brief written summary of results and recommended next steps

    • Feedback explaining whether a comprehensive academic or learning evaluation should be pursued

    Important: This is a screening service, not a comprehensive learning-disability evaluation. A screening result alone may not satisfy school or testing-agency documentation requirements.

  • Designed for: Adults who have noticed changes in memory, attention, language, orientation, or other thinking skills and need guidance about appropriate next steps.

    This evaluation may include:

    • A focused interview covering cognitive concerns, medical history, and daily functioning

    • Administration of the Montreal Cognitive Assessment, or MoCA, when appropriate

    • A brief written summary and results discussion

    • Recommendations for medical, neurological, psychological, or neuropsychological follow-up when indicated

    Important: This screening does not diagnose or rule out dementia, a neurological disorder, or a specific neurocognitive disorder and is not a substitute for a comprehensive neuropsychological evaluation.

  • Designed for: Individuals seeking a brief review of symptoms, cognitive concerns, and daily functioning following a concussion or traumatic brain injury. Results are intended to be shared with the individual’s medical provider to guide follow-up and determine whether additional specialty evaluation may be appropriate.

    This evaluation may include:

    • A focused interview regarding the injury, symptoms, medical care, and current functioning

    • Targeted symptom and cognitive screening

    • A brief written summary and results discussion

    • Recommendations for medical follow-up and, when indicated, neurological, rehabilitation, or comprehensive neuropsychological evaluation

    Important: This screening does not diagnose a concussion or traumatic brain injury, determine neurological causation, provide return-to-play or return-to-work clearance, or replace medical or comprehensive neuropsychological evaluation. Urgent or worsening neurological symptoms require immediate medical care.

What to Expect

  1. Initial forms and planning. After scheduling, you will receive detailed instructions, consent forms, questionnaires, and information about records that may be helpful.

  2. Clinical interview. Most full evaluations begin with an interview lasting at least 60 minutes. The interview may be completed in person or by secure telehealth. Parents or caregivers participate when appropriate.

  3. Records and questionnaires. Relevant medical, educational, psychological, or treatment records may be reviewed. Questionnaires may also be requested from parents, teachers, partners, caregivers, or other people who know the individual well.

  4. In-person testing. Psychological testing must be completed in person. Many evaluations involve approximately three hours of testing, although the length varies based on age, referral question, pace, fatigue, and the measures needed. Testing may be divided across appointments when clinically appropriate.

  5. Review and integration. After all required information is received, the results are scored, interpreted, and integrated into a written report. The report-turnaround goal is one week, although complex cases may require additional time.

  6. Feedback. A feedback appointment is used to review findings, answer questions, and discuss recommendations. Feedback may be completed in person or by telehealth.

Flexible Appointment Locations

Clinical interviews and feedback appointments may be completed in person or by secure telehealth. Testing is completed in person and may be offered in an office, in the client's home, or at another approved location when clinically appropriate. A combination of locations may be used across the evaluation.

The testing environment must support privacy, safety, standardized administration, and valid results. Some tests or clinical circumstances require an office setting. Dr. Grimmer retains sole clinical discretion to determine whether a requested location is appropriate. If a home or other requested setting is too noisy, distracting, crowded, unsafe, or otherwise unsuitable, testing may need to occur at an alternative location.

School Documentation and Accommodation Letters

Reports include practical recommendations intended to help families communicate with schools and other providers. A standard accommodations letter is included and available upon request when the evaluation findings support the requested accommodations. Screening services can support an accommodation letter only when the available clinical information is sufficient to justify one.

Dr. Grimmer does not attend IEP meetings, 504 Plan meetings, or other school meetings. The written report is designed to provide recommendations that can be reviewed by the school team. Schools, testing organizations, employers, and other institutions make their own eligibility and accommodation decisions, and an evaluation or letter cannot guarantee approval.

Payment and Insurance

The practice is entirely self-pay and does not accept or bill insurance. This allows Dr. Grimmer to use her training and clinical judgment to select the evaluation your family needs without an insurance company limiting the assessment process. A copy of your paid invoice will be provided. You may choose to submit the invoice to your insurance company for possible out-of-network reimbursement, but reimbursement is not guaranteed.

Cancellation Policy

If you are unable to attend a scheduled appointment, please cancel or reschedule at least 24 hours in advance. Appointments cancelled with less than 24 hours' notice, as well as missed appointments, may be charged at the full rate of the scheduled session.

Court and Legal Proceedings

If Dr. Grimmer is summoned to court or required to participate in a legal proceeding for any reason related to services provided, the rate is $250 per hour. Billable time may include preparation, record review, consultation, travel, waiting time, deposition, and testimony.

Important Scope Information

The appropriate service is determined by the referral question and clinical needs. If the requested service falls outside the scope of the practice or requires medical, neurological, speech-language, academic, or comprehensive neuropsychological expertise beyond the evaluation offered, a referral to an appropriate specialist may be recommended.