Drawing blood samples from patients for laboratory investigations

PAA\VQSET

vocational

This subtopic covers the practical skill and underpinning knowledge required to safely and competently draw venous blood samples from patients in a clinical setting for laboratory analysis. Learners must demonstrate proper patient identification, vein selection, use of equipment, infection control, and sample handling to ensure the integrity of specimens and compliance with standard operating procedures.

Learning Outcomes

Assessment Guidance

Key Skills

Key Terms

Assessment Criteria

Assessment criteria

PAA\VQSET Level 2 NVQ Diploma in Laboratory Science (QCF)

Learning Objectives

What you need to know and understand

1a. Draw blood samples from patients for laboratory investigations, 1b. Draw blood samples from patients for laboratory investigations (continued), 2a. Know how to draw blood samples from patients for laboratory investigations, 2b. Know how to draw blood samples from patients for laboratory investigations (continued)

Assessment Criteria

Key criteria assessors look for in your portfolio

Award credit for correctly identifying the patient using at least two identifiers (e.g., full name, date of birth, or NHS number) and matching to the request form before proceeding.
Award credit for selecting an appropriate vein (e.g., median cubital vein) and demonstrating correct technique for venepuncture, including anchor of the vein and needle insertion at the correct angle.
Award credit for adhering to the correct order of draw when multiple sample tubes are required, to prevent cross-contamination of additives and ensure accurate test results.
Award credit for disposing of the needle and other sharps immediately into a designated sharps container without recapping, and managing any clinical waste according to local policies.

Assessment Guidance

Guidance for achieving higher grades

💡In your observed assessments, always verbalize your actions as you perform them, particularly infection control steps and patient identification checks, to provide evidence for the assessor.
💡Familiarize yourself with the local phlebotomy SOPs and use them as a reference when compiling your knowledge evidence, ensuring you can explain the rationale behind each step.

Common Mistakes

Common errors to avoid in your coursework

Failing to obtain informed consent or not confirming the patient’s identity before proceeding with the procedure, leading to potential misidentification errors.
Leaving the tourniquet on for more than one minute, which can cause haemoconcentration and affect test results, or forgetting to release it before withdrawing the needle, causing haematoma.
Using a vein that appears small, fragile, or near a joint (e.g., basilic vein) without assessing its suitability first, resulting in collapsed veins or patient discomfort.
Labels being applied after blood collection, risking mislabelling or illegibility, or forgetting to invert tubes containing additives gently to ensure proper mixing.

Key Terminology

Essential terms to know

1a. Draw blood samples from patients for laboratory investigations, 1b. Draw blood samples from patients for laboratory investigations (continued), 2a. Know how to draw blood samples from patients for laboratory investigations, 2b. Know how to draw blood samples from patients for laboratory investigations (continued)

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Drawing blood samples from patients for laboratory investigations

Assessment criteria

Learning Objectives

Assessment Criteria

Assessment Guidance

Common Mistakes

Key Terminology

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