100+ Free SCYM Practice Questions

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Forward scatter (FSC) signal is most closely correlated with which cellular property?

Surface antigen density

Cell size

DNA content

Internal granularity

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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 100+ question experience with AI tutoring.

1A flow cytometer's blue laser emits at which wavelength, primarily exciting FITC and PE?

A.355 nm

B.405 nm

C.488 nm

D.633 nm

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

B.Cell size

C.DNA content

D.Surface antigen density

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

B.Cell viability

C.Internal complexity and granularity

D.Surface charge

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

B.A surrounding sheath fluid that constricts the sample stream

C.Electrostatic deflection plates

D.An acoustic standing wave

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

B.Photomultiplier tube (PMT)

C.CCD camera

D.Avalanche photodiode (APD) only

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.From 500 to 530 nm

B.From 515 to 545 nm

C.From 530 to 560 nm

D.Only at exactly 530 nm

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

B.Pacific Blue, BV421, BV510, BV605

C.APC and APC-Cy7

D.BUV395 and BUV737

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.Does not require lasers

B.Captures the full emission spectrum of each fluorochrome and uses unmixing algorithms instead of compensation matrices

C.Cannot detect tandem dyes

D.Replaces PMTs with CCD cameras

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.Lower sensitivity, used in cell sorters where the stream exits into air for droplet formation

B.Higher sensitivity, used in benchtop analyzers

C.Spectral unmixing only

D.Acoustic focusing

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.The voltage applied to the deflection plates

B.The time between when a cell crosses the laser and when its containing droplet reaches the deflection plates so the correct droplet is charged

C.The threshold for sorting

D.The 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

25%

Flow Cytometry Principles & Instrumentation

Lasers (488/561/405/633), FSC/SSC, fluorochromes, compensation, FMO controls

30%

Hematolymphoid Immunophenotyping

CLL, MCL, MM, AML, ALL, B-NHL panels; clonality kappa/lambda; MRD

10%

HIV/CD4 & Other Clinical Applications

CD4 absolute count, HIV monitoring (<200 AIDS), lymphocyte subsets

10%

Stem Cell Enumeration & Apoptosis

ISHAGE CD34/CD45 protocol, CD34 dose calculation, Annexin V/PI

15%

Data Analysis & Gating Strategies

FSC vs SSC, CD45/SSC gating, doublet exclusion, Boolean gating, MRD

10%

QC, Compliance & Lab Operations

CS&T beads, voltage standardization, ICCS guidelines, CLSI H42, CAP/CLIA

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 Hematolymphoid Immunophenotyping (30%) and Instrumentation (25%) — together over half the exam. Master Matutes/Moreau scores, ISCN-defined leukemia/lymphoma markers, fluorochrome spectra and compensation, ISHAGE CD34 enumeration, and ICCS/CLSI flow cytometry standards.