PracticeVideosBlogFlashcardsEspañol
All Practice Exams

125+ Free SCYM Practice Questions

Prepare for the ASCP Specialist in Cytometry exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
125+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More ASCP Certifications

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

ASCP Phlebotomy Technician (PBT)

Practice QuestionsStudy Guide2 videos4 blogs

ASCP Medical Lab Technician (MLT)

Practice QuestionsStudy GuideCheat SheetFlashcards1 video1 blog

ASCP Medical Laboratory Scientist (MLS)

Practice QuestionsStudy GuideCheat SheetFlashcards1 video1 blog

ASCP Specialist in Blood Banking

Practice QuestionsStudy Guide

ASCP Blood Banking Technologist

Practice Questions1 video1 blog

ASCP Molecular Biology Technologist

Practice Questions1 video1 blog

More From This Family

Videos and articles for deeper review.

VideoASCP Blood Banking Technologist Exam Guide 2026: Train Panel Logic FirstVideoASCP MB Exam Guide 2026: Molecular Biology Eligibility, CAT Scoring, and Free PracticeVideoFREE ASCP MLS + MLT Study Guide 2026: 10-Week PlanVideoFREE ASCP MLS + MLT Study Guide 2026: 10-Week PlanArticlePhlebotomy Certification Exam Prep 2026: FREE Study Guide19 min readArticleBest Phlebotomy Certification 2026: Which to Choose10 min readArticleNHA vs ASCP vs AMT vs NCCT: 2026 Phlebotomy Guide10 min readArticleASCP MB Exam Guide 2026: Molecular Biology Eligibility, CAT Scoring, and Free Practice12 min read
2026 Statistics

Key Facts: SCYM Exam

100

Total Items

ASCP BOC

$310

Exam Fee

ASCP

4 yrs

Required Experience

Flow cytometry

ISHAGE

CD34 Protocol

Standard for HCT

The ASCP SCYM (Specialist in Cytometry) is a Specialist-level BOC credential. 100 MCQ items, 2h 30m, $310 fee. Eligibility: bachelor's + 4 yrs flow cytometry experience. Master fluorochrome panels and compensation, CLL Matutes score (CD5+CD19+CD23+), AML markers (CD34/CD117/MPO), CD34 stem cell enumeration via ISHAGE, and CS&T daily QC.

Sample SCYM Practice Questions

Try these sample questions to test your SCYM exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 125+ question experience with AI tutoring.

1A flow cytometer's blue laser emits at which wavelength, primarily exciting FITC and PE?
A.355 nm UV laser wavelength
B.405 nm violet laser wavelength
C.488 nm blue laser wavelength
D.633 nm red laser wavelength
Explanation: The 488 nm blue laser is the workhorse of conventional flow cytometry, exciting FITC (em 525 nm), PE (em 575 nm), PerCP, PE-Cy5, and PE-Cy7 tandems.
2Forward scatter (FSC) signal is most closely correlated with which cellular property?
A.Internal granularity measured by side scatter
B.Cell size estimated by forward scatter
C.DNA content measured by PI or DAPI
D.Surface antigen density from antibody fluorescence
Explanation: Forward scatter is light diffracted at small angles (typically 0.5-5 degrees) from the laser axis and is roughly proportional to cell surface area or cross-sectional size.
3Side scatter (SSC) is primarily a measure of:
A.Cell volume correlating with forward scatter
B.Cell viability from membrane-impermeable dyes
C.Internal complexity and cytoplasmic granularity
D.Surface electrical charge on the plasma membrane
Explanation: SSC is collected at approximately 90 degrees to the incident laser and reflects internal complexity such as granules, organelles, and nuclear lobulation. Granulocytes have very high SSC; lymphocytes have low SSC.
4Hydrodynamic focusing in a flow cytometer is achieved by:
A.Magnetic confinement of cells in the core stream
B.Sheath fluid constricts the sample into single-file flow
C.Electrostatic deflection plates in the interrogation zone
D.Acoustic standing wave without sheath fluid
Explanation: Sheath fluid surrounds the sample core stream and, by laminar flow physics, constricts cells into single file as they pass through the interrogation point.
5Which detector type is most commonly used for fluorescence detection in conventional flow cytometers?
A.Photodiode detector for forward scatter
B.Photomultiplier tube for fluorescence
C.CCD camera for imaging cytometry
D.Avalanche photodiode as sole fluorescence detector
Explanation: PMTs are standard fluorescence detectors due to high gain and sensitivity. Newer spectral systems and some instruments (e.g., Aurora, ID7000) use APD arrays for improved red/NIR detection.
6A bandpass filter labeled 530/30 transmits light:
A.500-530 nm band below filter center
B.515-545 nm band centered at 530 nm
C.530-560 nm band above filter center
D.Exactly 530 nm with no bandwidth
Explanation: A bandpass filter is centered at the first number (530 nm) with a bandwidth equal to the second number (30 nm), so it passes 515-545 nm. This is the standard FITC detector filter.
7The 405 nm violet laser is used to excite which fluorochromes?
A.FITC and PE on the 488 nm laser
B.Pacific Blue, BV421, BV510, BV605
C.APC and APC-Cy7 on the 633 nm laser
D.BUV395 and BUV737 on the 355 nm laser
Explanation: The violet (405 nm) laser excites Pacific Blue (em 450), BV421, BV510, BV605, BV650, BV711, BV786, and similar Brilliant Violet polymer dyes.
8Spectral flow cytometry differs from conventional flow cytometry primarily because it:
A.Spectral cytometry does not use excitation lasers
B.Full-spectrum capture with computational unmixing
C.Tandem dyes cannot be resolved on spectral systems
D.All PMT detectors replaced by CCD imaging
Explanation: Spectral cytometers (Aurora, ID7000) capture the entire emission spectrum across many detectors and apply spectral unmixing using single-stained reference spectra, enabling use of fluorochromes with similar peak emissions but distinct full spectra.
9A jet-in-air flow cell design (vs cuvette) is most associated with:
A.Jet-in-air design for droplet sorting in cell sorters
B.Cuvette flow cell for maximum analyzer sensitivity
C.Spectral unmixing exclusive to jet-in-air optics
D.Acoustic focusing replaces hydrodynamic sheath
Explanation: Jet-in-air designs are used in cell sorters (e.g., FACSAria) because the stream must exit into air to form droplets for sorting; this typically has slightly lower sensitivity than cuvette designs used in analyzers.
10On a sort, the drop delay determines:
A.Voltage applied to electrostatic deflection plates
B.Laser-to-droplet delay for correct droplet charging
C.Minimum fluorescence threshold for event recording
D.Sample pressure setting controlling flow rate
Explanation: Drop delay is the precise number of droplets between the interrogation point and the break-off point; if incorrect, the wrong droplet is charged and sort purity drops drastically.

About the SCYM Exam

ASCP BOC Specialist-level credential for senior flow cytometry technologists. Co-administered with the cytometry community. Validates expertise in flow cytometry instrumentation (lasers, optics, fluidics, fluorochromes, compensation), hematolymphoid immunophenotyping (CLL, MCL, AML, B-ALL, T-ALL, plasma cell, MRD), HIV CD4 monitoring, stem cell enumeration (ISHAGE protocol), apoptosis assays, data analysis/gating, and quality control.

Questions

100 scored questions

Time Limit

2 hours 30 minutes

Passing Score

Scaled

Exam Fee

$310 (ASCP BOC)

SCYM Exam Content Outline

15-20%

Instrumentation

Fluidic systems, optical layout, lasers, filters, detectors, electronics, pulse processing, and troubleshooting

25-30%

Panel & Experiment Design

Sample collection and integrity, cell preparation and staining, cell enrichment, fluorochrome selection, compensation, controls, and assay optimization

25-30%

Applications

Immunophenotyping, functional assays, multiplex bead assays, solid organ transplant/HLA, stem cell enumeration, cell cycle/DNA ploidy, rare event/small particle analysis, fetal hemoglobin, cell sorting, imaging cytometry, mass cytometry, and immune monitoring

15-20%

Data

Data standards (FCS), signal processing, data display/transformations, gating hierarchy, statistical/high-dimensional analysis, data modeling, quantitative calibration, and data troubleshooting

10-15%

Laboratory Operations

Quality control, assay validation and verification, biosafety and aerosol containment, laboratory administration, and regulatory compliance (CLIA, CAP, FDA)

How to Pass the SCYM Exam

What You Need to Know

  • Passing score: Scaled
  • Exam length: 100 questions
  • Time limit: 2 hours 30 minutes
  • Exam fee: $310

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

SCYM Study Tips from Top Performers

1Master fluorochrome lasers: 488 (FITC, PE), 561 (PE+), 405 (BV/Pacific Blue series), 633/635 (APC, AlexaFluor 647)
2Know CLL Matutes score and key panel: CD5+CD19+CD23+ + sIg dim + FMC7- (4-5/5 supports CLL)
3Memorize AML lineage markers: CD34 (precursor), CD117/c-KIT (myeloid), MPO (myeloid commitment), CD13/CD33 (myeloid); APL (M3) is HLA-DR-negative
4Apply ISHAGE for CD34: SSC/CD45 → CD34+/CD45dim → 7-AAD viable; report absolute count and dose/kg
5Understand compensation vs FMO: compensation corrects spectral spillover; FMO sets accurate positive gates

Frequently Asked Questions

What is ISHAGE?

ISHAGE is the standard protocol for CD34+ stem cell enumeration in HCT (hematopoietic cell transplant) products. Single-platform gating: SSC/CD45 → CD34+/CD45dim → 7-AAD- (viability). Reports absolute CD34+ cells/μL and total CD34+ cells per kg recipient body weight. Transplant target dose typically ≥2-5 × 10⁶ CD34+/kg.

What is the CLL Matutes score?

Matutes (also called Royal Marsden) score for CLL diagnosis: 1 point each for (1) CD5+; (2) CD23+; (3) sIg dim; (4) FMC7-; (5) CD22 or CD79b weak/negative. Score ≥4 supports CLL; score ≤3 suggests another B-cell lymphoma (mantle cell t(11;14) cyclin D1+ scores low — often 1-2).

What is FMO?

Fluorescence-Minus-One controls — used to set gates near positive populations when spectral spillover from other channels matters. For each fluorochrome in the panel, FMO control omits that fluorochrome but includes all others; the gate is set just above the FMO background. More accurate than isotype controls for complex panels.

How should I study for ASCP SCYM?

Plan 60-100 hours over 8-12 weeks. Focus on Applications (25-30%), Panel & Experiment Design (25-30%), and Instrumentation (15-20%) — together 70-80% of the exam. Master Matutes/Moreau scores, ISCN-defined leukemia/lymphoma markers, fluorochrome spectra and compensation, ISHAGE CD34 enumeration, and ICCS/CLSI flow cytometry standards.