MLS ASCP EXAM NEWEST 2026 ACTUAL EXAM TEST
BANK| COMPLETE 1200 REAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+| ASCP MLS CERTIFICATION
EXAM PREP 2026 (BRAND NEW!!)
1. A patient's forward typing shows strong reactivity with
anti-A and anti-B reagents. Reverse typing shows no
reactivity with A1 or B cells. What is the most likely
explanation?
A. Bombay phenotype
B. Acquired B phenomenon
C. Newborn with immature immune system
D. Cold autoantibody interfering with reverse typing
Correct Answer: C
Rationale: Newborns do not produce significant levels of ABO
1
,antibodies until 3–6 months of age. Forward typing is reliable,
but reverse typing will be negative or weak.
2. Which antibody is most likely to be missed if the antibody
screen is performed only at immediate spin and 37°C but not
at AHG?
A. Anti-M
B. Anti-Lea
C. Anti-K
D. Anti-P1
Correct Answer: C
Rationale: Anti-K is an IgG antibody that only reacts at the
antihuman globulin (AHG) phase. IgM antibodies (Anti-M, anti-
Lea, anti-P1) react at immediate spin or room temperature.
2
,3. A DAT is positive on a patient's RBCs with IgG only. The
eluate reacts with all panel cells tested. The serum does not
react with panel cells. What is the most likely diagnosis?
A. Alloanti-D
B. Warm autoimmune hemolytic anemia (WAIHA)
C. Cold agglutinin disease
D. Drug-induced hemolytic anemia with drug-dependent
antibody
Correct Answer: B
Rationale: WAIHA shows positive DAT (IgG), panagglutinating
eluate (autoantibody), and negative serum screen (antibody
adsorbed onto patient's RBCs).
4. Which of the following is the primary cause of ABO
hemolytic disease of the fetus and newborn (HDFN)?
A. Mother is group A, baby is group B
3
, B. Mother is group O, baby is group A or B
C. Mother is group B, baby is group A
D. Mother is group AB, baby is group O
Correct Answer: B
Rationale: Group O mothers have IgG anti-A and anti-B that
cross the placenta. ABO HDFN is almost always seen in group A
or B infants of group O mothers.
5. A patient has a positive antibody screen. The panel shows
reactivity with all 10 panel cells at 2+ strength, but the
autocontrol is negative. What is the most likely antibody?
A. Warm autoantibody
B. Anti-k (Cellano)
C. Anti-K
D. Anti-Lea
4
BANK| COMPLETE 1200 REAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+| ASCP MLS CERTIFICATION
EXAM PREP 2026 (BRAND NEW!!)
1. A patient's forward typing shows strong reactivity with
anti-A and anti-B reagents. Reverse typing shows no
reactivity with A1 or B cells. What is the most likely
explanation?
A. Bombay phenotype
B. Acquired B phenomenon
C. Newborn with immature immune system
D. Cold autoantibody interfering with reverse typing
Correct Answer: C
Rationale: Newborns do not produce significant levels of ABO
1
,antibodies until 3–6 months of age. Forward typing is reliable,
but reverse typing will be negative or weak.
2. Which antibody is most likely to be missed if the antibody
screen is performed only at immediate spin and 37°C but not
at AHG?
A. Anti-M
B. Anti-Lea
C. Anti-K
D. Anti-P1
Correct Answer: C
Rationale: Anti-K is an IgG antibody that only reacts at the
antihuman globulin (AHG) phase. IgM antibodies (Anti-M, anti-
Lea, anti-P1) react at immediate spin or room temperature.
2
,3. A DAT is positive on a patient's RBCs with IgG only. The
eluate reacts with all panel cells tested. The serum does not
react with panel cells. What is the most likely diagnosis?
A. Alloanti-D
B. Warm autoimmune hemolytic anemia (WAIHA)
C. Cold agglutinin disease
D. Drug-induced hemolytic anemia with drug-dependent
antibody
Correct Answer: B
Rationale: WAIHA shows positive DAT (IgG), panagglutinating
eluate (autoantibody), and negative serum screen (antibody
adsorbed onto patient's RBCs).
4. Which of the following is the primary cause of ABO
hemolytic disease of the fetus and newborn (HDFN)?
A. Mother is group A, baby is group B
3
, B. Mother is group O, baby is group A or B
C. Mother is group B, baby is group A
D. Mother is group AB, baby is group O
Correct Answer: B
Rationale: Group O mothers have IgG anti-A and anti-B that
cross the placenta. ABO HDFN is almost always seen in group A
or B infants of group O mothers.
5. A patient has a positive antibody screen. The panel shows
reactivity with all 10 panel cells at 2+ strength, but the
autocontrol is negative. What is the most likely antibody?
A. Warm autoantibody
B. Anti-k (Cellano)
C. Anti-K
D. Anti-Lea
4
