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Phlebotomy, Specimen Handling & Blood Transfusion Safety (Nursing & Patient Care) Solved Questions & Notes (2026) - Apex Rankers

Medical & Health Sciences > Nursing & Patient Care > Phlebotomy, Specimen Handling & Blood Transfusion Safety

100 Total Solved Questions
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Phlebotomy, Specimen Handling & Blood Transfusion Safety

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Q. 1 Nursing
Difficulty: medium (1 Mark)
In specialized clinical nursing practice: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
B
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
C
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
D
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 2 Nursing
Difficulty: hard (1 Mark)
Under ISPD, CDC and critical care nursing protocols, according to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
B
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
C
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
D
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 3 Nursing
Difficulty: hard (1 Mark)
A registered dialysis / ICU staff nurse caring for a clinical patient reviews: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
B
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
C
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
D
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 4 Nursing
Difficulty: medium (1 Mark)
Regarding patient safety, aseptic procedures, and hospital infection prevention: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
B
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
C
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
D
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 5 Nursing
Difficulty: hard (1 Mark)
In emergency resuscitation, patient monitoring, and clinical triage, according to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
B
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
C
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
D
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 6 Nursing
Difficulty: hard (1 Mark)
Under medication administration rights, dosage calculations, and pharmacovigilance: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
B
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
C
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
D
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 7 Nursing
Difficulty: medium (1 Mark)
Which nursing intervention is prioritized when considering: according to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
B
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
C
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
D
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 8 Nursing
Difficulty: hard (1 Mark)
During perioperative nursing care and post-transplant patient management: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
B
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
C
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
D
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 9 Nursing
Difficulty: medium (1 Mark)
In diagnostic blood collection, vacutainer handling, and transfusion safety: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
B
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
C
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
D
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 10 Nursing
Difficulty: medium (1 Mark)
From the perspective of bedside nursing fundamentals and quality patient care: According to the Clinical and Laboratory Standards Institute (CLSI) guidelines, what is the correct Order of Draw for evacuated blood collection tubes during venipuncture?
A
Lavender (EDTA) -> Light Blue (Citrate) -> Blood Cultures -> Red/Gold (Serum) -> Gray
B
Blood Culture bottles -> Light Blue (Citrate) -> Red/Gold (Serum SST) -> Green (Heparin) -> Lavender (EDTA) -> Gray (Fluoride/Oxalate)
✓ Correct
C
Gray (Fluoride) -> Green (Heparin) -> Lavender (EDTA) -> Light Blue -> Blood Cultures
D
Red/Gold (Serum) -> Lavender (EDTA) -> Green (Heparin) -> Blood Cultures -> Light Blue
💡 Step-by-Step Explanation & Concept Rationale
The CLSI order of draw prevents cross-contamination of tube additives: Blood cultures first, then Coagulation (Citrate), Serum tubes, Heparin tubes, EDTA tubes, and finally Glycolytic inhibitors (Fluoride/Oxalate).
Q. 11 Nursing
Difficulty: medium (1 Mark)
In specialized clinical nursing practice: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
B
Lithium Heparin with polymer gel separator
C
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
D
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 12 Nursing
Difficulty: hard (1 Mark)
Under ISPD, CDC and critical care nursing protocols, which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
Lithium Heparin with polymer gel separator
B
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
C
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
D
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 13 Nursing
Difficulty: hard (1 Mark)
A registered dialysis / ICU staff nurse caring for a clinical patient reviews: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
B
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
C
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
D
Lithium Heparin with polymer gel separator
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 14 Nursing
Difficulty: medium (1 Mark)
Regarding patient safety, aseptic procedures, and hospital infection prevention: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
B
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
C
Lithium Heparin with polymer gel separator
D
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 15 Nursing
Difficulty: hard (1 Mark)
In emergency resuscitation, patient monitoring, and clinical triage, which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
Lithium Heparin with polymer gel separator
B
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
C
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
D
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 16 Nursing
Difficulty: hard (1 Mark)
Under medication administration rights, dosage calculations, and pharmacovigilance: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
B
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
C
Lithium Heparin with polymer gel separator
D
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 17 Nursing
Difficulty: medium (1 Mark)
Which nursing intervention is prioritized when considering: which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
B
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
C
Lithium Heparin with polymer gel separator
D
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 18 Nursing
Difficulty: hard (1 Mark)
During perioperative nursing care and post-transplant patient management: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
Lithium Heparin with polymer gel separator
B
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
C
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
D
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 19 Nursing
Difficulty: medium (1 Mark)
In diagnostic blood collection, vacutainer handling, and transfusion safety: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
B
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
C
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
D
Lithium Heparin with polymer gel separator
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 20 Nursing
Difficulty: medium (1 Mark)
From the perspective of bedside nursing fundamentals and quality patient care: Which additive and blood-to-anticoagulant ratio is present in Light Blue top evacuated tubes used for Coagulation profiles (PT/INR and aPTT)?
A
K2-EDTA with a 1:1 blood-to-anticoagulant ratio
B
Lithium Heparin with polymer gel separator
C
Sodium Fluoride and Potassium Oxalate in a 4:1 ratio
D
3.2% Sodium Citrate with a strict 9:1 blood-to-anticoagulant ratio (must be filled completely to the fill line)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Light blue tubes contain 3.2% buffered sodium citrate and require an exact 9:1 blood-to-anticoagulant ratio; underfilling alters plasma dilution and falsely prolongs coagulation clotting times.
Q. 21 Nursing
Difficulty: medium (1 Mark)
In specialized clinical nursing practice: What is the maximum duration a tourniquet should remain applied to a patient arm during routine venipuncture to prevent hemoconcentration and erroneous laboratory results?
A
No longer than 1 minute (60 seconds)
✓ Correct
B
Up to 5 minutes to ensure maximal vein engorgement
C
At least 10 minutes until all tubes are completely collected
D
Tourniquets must remain tied until the venipuncture needle is completely removed
💡 Step-by-Step Explanation & Concept Rationale
Tourniquet application > 1 minute causes localized hemoconcentration, protein shift, and false elevation of potassium, total protein, albumin, and calcium levels.
Q. 22 Nursing
Difficulty: hard (1 Mark)
Under ISPD, CDC and critical care nursing protocols, what is the maximum duration a tourniquet should remain applied to a patient arm during routine venipuncture to prevent hemoconcentration and erroneous laboratory results?
A
At least 10 minutes until all tubes are completely collected
B
No longer than 1 minute (60 seconds)
✓ Correct
C
Tourniquets must remain tied until the venipuncture needle is completely removed
D
Up to 5 minutes to ensure maximal vein engorgement
💡 Step-by-Step Explanation & Concept Rationale
Tourniquet application > 1 minute causes localized hemoconcentration, protein shift, and false elevation of potassium, total protein, albumin, and calcium levels.
Q. 23 Nursing
Difficulty: hard (1 Mark)
A registered dialysis / ICU staff nurse caring for a clinical patient reviews: What is the maximum duration a tourniquet should remain applied to a patient arm during routine venipuncture to prevent hemoconcentration and erroneous laboratory results?
A
Tourniquets must remain tied until the venipuncture needle is completely removed
B
Up to 5 minutes to ensure maximal vein engorgement
C
No longer than 1 minute (60 seconds)
✓ Correct
D
At least 10 minutes until all tubes are completely collected
💡 Step-by-Step Explanation & Concept Rationale
Tourniquet application > 1 minute causes localized hemoconcentration, protein shift, and false elevation of potassium, total protein, albumin, and calcium levels.
Q. 24 Nursing
Difficulty: medium (1 Mark)
Regarding patient safety, aseptic procedures, and hospital infection prevention: What is the maximum duration a tourniquet should remain applied to a patient arm during routine venipuncture to prevent hemoconcentration and erroneous laboratory results?
A
Up to 5 minutes to ensure maximal vein engorgement
B
At least 10 minutes until all tubes are completely collected
C
Tourniquets must remain tied until the venipuncture needle is completely removed
D
No longer than 1 minute (60 seconds)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Tourniquet application > 1 minute causes localized hemoconcentration, protein shift, and false elevation of potassium, total protein, albumin, and calcium levels.
Q. 25 Nursing
Difficulty: hard (1 Mark)
In emergency resuscitation, patient monitoring, and clinical triage, what is the maximum duration a tourniquet should remain applied to a patient arm during routine venipuncture to prevent hemoconcentration and erroneous laboratory results?
A
No longer than 1 minute (60 seconds)
✓ Correct
B
At least 10 minutes until all tubes are completely collected
C
Tourniquets must remain tied until the venipuncture needle is completely removed
D
Up to 5 minutes to ensure maximal vein engorgement
💡 Step-by-Step Explanation & Concept Rationale
Tourniquet application > 1 minute causes localized hemoconcentration, protein shift, and false elevation of potassium, total protein, albumin, and calcium levels.
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