QIHC study plan
QIHC · Give each week a clear focus.
8 weeks · About 7 hours per week
Preanalytic variables and specimen handling (fixation, processing, sectioning, antigen preservation)
Map the full preanalytic timeline from excision to microtomy and label each point where cold ischemia, fixative volume, fixation time, or temperature can degrade antigen
Compare recommended neutral buffered formalin windows for small biopsies versus large resections and state the differential effect of under- and over-fixation on nuclear versus cytoplasmic antigens
Sequence each processing step (dehydration, clearing, embedding, section thickness, floatation temperature, bake time) and rank the steps that most affect antigen preservation
Contrast decalcification approaches used for bone and marrow specimens and predict their impact on subsequent immunostaining
Your checkpoint
One-page preanalytic flowchart plus a variable table listing acceptable ranges and the failure consequence of exceeding each range
Antigen retrieval and pretreatment (heat-induced and enzymatic methods, buffer selection, optimization) & Preanalytic variables and specimen handling (fixation, processing, sectioning, antigen preservation)
Distinguish heat-induced epitope retrieval from enzymatic digestion and match each method to antigen classes and subcellular localizations
Compare citrate pH 6, EDTA pH 8-9, and Tris-EDTA buffers and state the selection rule linking buffer to target localization
Evaluate retrieval platforms (water bath, steamer, pressure cooker, microwave) on achieved temperature, hold time, and run-to-run reproducibility
Design a checkerboard titration that optimizes retrieval time and primary antibody dilution simultaneously
Explain retrieval compatibility constraints for multiplex panels, including sequential retrieval, antibody stripping, and species order
Your checkpoint
Retrieval optimization worksheet: a checkerboard grid with pass/fail criteria and a written rule for selecting buffer by localization
Staining methods and detection systems (direct/indirect, polymers, amplification, chromogens, multiplexing)
Contrast direct, indirect, and polymer-based detection for sensitivity, endogenous biotin interference, and nonspecific background
Compare DAB, AEC, alkaline phosphatase red, and Fast Red chromogens and state selection criteria including counterstain interaction and mounting medium compatibility
Explain tyramide signal amplification and avidin-biotin complex chemistry and describe the background-versus-sensitivity trade-off of each
Trace signal generation from primary antibody through chromogen deposition step by step and identify the failure point associated with each reagent
Differentiate endogenous peroxidase, endogenous alkaline phosphatase, and endogenous biotin blocking strategies and specify when each is required
Your checkpoint
Detection system selection matrix with platform/chromogen combinations scored for sensitivity, background risk, multiplex fit, and recommended use case
Staining methods and detection systems (direct/indirect, polymers, amplification, chromogens, multiplexing) & Controls, validation, and quality assurance/quality control
Design a sequential multiplex panel specifying antibody stripping/denaturation steps, species ordering, and chromogen contrast pairing
Evaluate co-localization and cross-reactivity risks in multiplex and describe how single-stain controls verify them
Build a new-antibody validation plan covering sensitivity, specificity, precision, and reportable result thresholds
Draft the acceptance criteria that must be met before a new antibody or detection system enters clinical use
Your checkpoint
Written multiplex panel protocol with associated control set list and explicit acceptance criteria
Controls, validation, and quality assurance/quality control
Construct a control block for each antibody containing a known-positive tissue, a negative tissue, and a reagent negative control
Apply acceptance criteria for positive and negative control performance and state the required action when a control fails
Distinguish daily quality control, lot-to-lot comparison, and proficiency testing and translate each into log entries
Evaluate the documentation elements of validation records, including concordance, reproducibility, and limit of detection
Your checkpoint
Quality control log template containing daily, lot-change, and proficiency testing entries with written decision rules
Controls, validation, and quality assurance/quality control & Interpretation, localization patterns, and reporting
Explain how altered fixation or retrieval shifts control performance and separate control failure from test specimen failure
Classify nuclear, cytoplasmic, membranous, and combined staining patterns and state the pitfall associated with each
Differentiate true immunostaining from endogenous pigment and counterstain by listing concrete discriminators
Compose complete report elements including clone, platform, control status, and percentage/intensity scoring
Your checkpoint
Set of ten written case scenarios, each resolved with pattern assignment, control status interpretation, and a complete report sentence
Troubleshooting and problem solving (background, weak or absent staining, edge artifacts) & Interpretation, localization patterns, and reporting
Diagnose weak or absent staining using a decision tree that traverses fixation, retrieval, antibody, detection, and chromogen
Troubleshoot background by separating edge artifact, nonspecific binding, endogenous peroxidase activity, and dried-out sections and stating the corrective action for each
Rank corrective actions by likelihood and cost, testing retrieval changes before replacing reagents
Recognize necrotic, fibrotic, and edge artifact traps that mimic false-negative or false-positive results
Your checkpoint
One-page troubleshooting decision tree with eight scenarios resolved to root cause and corrective action
Safety, regulatory, and laboratory operations & Staining methods and detection systems (direct/indirect, polymers, amplification, chromogens, multiplexing) & Controls, validation, and quality assurance/quality control
Summarize safety requirements for formalin, DAB, and organic solvents and describe waste stream segregation practices
List regulatory requirements for immunohistochemical assays, including assay classification, documentation, and competency records
Practice laboratory operations tasks such as reagent lot tracking, inventory rotation, and temperature monitoring logs
Assemble a condensed high-yield summary of detection systems and control requirements for final review
Your checkpoint
Completed safety and compliance checklist plus a full-length mixed practice examination scored at 80% or higher
Milestones
Week 2: State from memory the buffer selection rule for nuclear, cytoplasmic, and membranous targets and complete the retrieval checkerboard worksheet without reference notes
Week 4: Score 80% or higher on a 50-question mixed set covering preanalytic variables, antigen retrieval, and detection systems
Week 6: Resolve all ten case scenarios with correct staining pattern, correct control interpretation, and a report sentence that omits no required element
Week 8: Submit all eight weekly deliverables, score 80% or higher on the final practice examination, and confirm each domain has been reviewed at least once