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NK Cells (CD3/CD16/CD56)

NK Cells Blood Test (CD3/CD16/CD56) – Immune System & Fertility Assessment

The NK Cells Blood Test (CD3/CD16/CD56) is a specialised immunology blood test used to measure Natural Killer (NK) cells, a key part of the immune system. This private NK cell test helps assess immune function and is commonly used in fertility investigations, recurrent miscarriage cases, and immune-related conditions.

At Vitalync Diagnosis, we offer advanced immune testing near you, with fast results and clinically reliable analysis.

What Are NK Cells?

Natural Killer (NK) cells are a type of white blood cell that play an essential role in the body’s immune defence by:

Targeting and destroying infected or abnormal cells

Regulating immune responses

Supporting early defence against viruses and tumours

This test measures NK cells using markers such as CD3, CD16, and CD56, providing insight into immune activity and balance.

What Does the NK Cells Test Measure?

This immune function blood test evaluates:

CD3 – T-cell marker (used to differentiate NK cells from T lymphocytes)

CD16 & CD56 – Surface markers used to identify and quantify NK cells

NK Cell Levels & Distribution – Helps determine immune system activity

Abnormal NK cell levels or activity may be linked to immune dysfunction or reproductive challenges.

Why This Test Is Important

The NK cells blood test is particularly valuable in:

Recurrent miscarriage investigations

Fertility assessments (implantation failure)

Autoimmune condition screening

Chronic inflammation or immune imbalance

Understanding NK cell levels can help guide treatment plans, fertility support, and further specialist investigations.

When Is NK Cell Testing Recommended?

You may consider this private NK cell test near you if you have:

Recurrent pregnancy loss or IVF implantation failure

Unexplained infertility

Suspected immune system dysfunction

Autoimmune conditions

Ongoing inflammation or chronic illness symptoms

How the NK Cells Blood Test Works

A simple blood sample is collected at one of our private clinics near you

The sample is analysed using advanced laboratory techniques

NK cell markers (CD3/CD16/CD56) are measured and interpreted

Results are provided with clear clinical insights

Accurate & Trusted Laboratory Testing

All samples are processed by UKAS-accredited laboratories, ensuring high levels of accuracy, reliability, and clinical quality. Results can support both patients and healthcare professionals in making informed decisions.