1,25-dihydroxyvitamin D (calcitriol)
This test measures 1,25-dihydroxyvitamin D, the biologically active form of vitamin D. It is used to investigate calcium imbalance, kidney disease and...
Zinc (Red Cell)
70.00
The red cell zinc test measures zinc inside red blood cells. It reflects longer-term zinc status more accurately than serum testing.
Turnaround time
2 days
Biomarkers count
1
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Zinc (Red Cell)
What is the Zinc (Red Cell) test?
The Zinc (Red Cell) blood test measures zinc concentration within red blood cells rather than in serum. Because zinc is primarily an intracellular mineral, red cell measurement provides a more accurate reflection of long-term zinc status.
Zinc is essential for immune function, wound healing, hormone production, DNA synthesis, and neurological health. Serum zinc levels can fluctuate with stress, infection, or recent intake, whereas red cell zinc reflects tissue stores over time.
This test is often preferred when zinc deficiency is suspected despite normal serum zinc results.
Why do I need a test for Zinc (Red Cell)?
Zinc deficiency can be subtle and chronic, affecting multiple systems before obvious symptoms appear. Red cell zinc testing helps identify hidden or long-standing deficiency that may be missed by standard blood tests.
It is particularly useful in individuals with immune dysfunction, digestive disorders, hormonal imbalance, or increased nutritional demands.
You may benefit from this test if you experience:
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Frequent infections or poor immunity
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Slow wound healing
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Hair loss or brittle nails
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Skin problems or acne
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Poor appetite or taste changes
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Hormonal imbalance or fertility concerns
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Digestive or absorption issues
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Chronic fatigue or brain fog
Benefits of the Zinc (Red Cell) test
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Reflects long-term zinc status
Measures intracellular zinc rather than short-term fluctuations. -
More reliable than serum zinc
Less affected by stress or recent intake. -
Supports immune health assessment
Zinc is critical for immune cell function. -
Useful in digestive and absorption disorders
Detects deficiency related to malabsorption. -
Supports hormonal and reproductive health
Zinc plays a role in testosterone, fertility, and thyroid function. -
Relevant for skin and wound healing issues
Identifies deficiency affecting tissue repair. -
Supports neurological and cognitive health
Zinc is involved in neurotransmission. -
Guides targeted nutritional support
Helps personalise supplementation strategies.
Step-by-step – how we offer Zinc (Red Cell) testing
Clinic-based testing (UK-wide)
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Choose your nearest UK clinic
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Attend your appointment
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Blood sample collected by a qualified clinician or phlebotomist
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Sample is sent to the laboratory for analysis
At-home or hotel testing (+£60)
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A qualified phlebotomist visits your home or hotel
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Blood sample collected in a comfortable, familiar setting
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No clinic visit or travel required
Both services are available UK-wide.
Your Zinc (Red Cell) results explained
Low red cell zinc levels
Low levels indicate zinc deficiency at a cellular level. This may impair immune function, hormone production, wound healing, and neurological processes.
Causes may include poor intake, malabsorption, chronic illness, or increased demand.
UK reference interpretation:
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Low: Below laboratory reference range
Normal red cell zinc levels
Normal levels suggest adequate zinc availability within cells and healthy long-term zinc status. This supports immune resilience and metabolic function.
Symptoms may still occur if other nutrients are deficient.
UK reference interpretation:
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Normal: Within laboratory reference range
High red cell zinc levels
High levels are uncommon and usually related to supplementation. Excess zinc can interfere with copper absorption and immune balance.
Clinical context is important when interpreting elevated results.
UK reference interpretation:
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High: Above laboratory reference range
How It Works
Simple steps to get your results
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Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
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Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
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Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
It measures zinc concentration inside red blood cells.
Yes, it reflects long-term zinc status more accurately.
Yes, zinc is essential for immune defence.
Yes, it supports reproductive and thyroid hormones.
Yes, malabsorption is a common cause.
Yes, supplements can raise zinc levels.
Yes, zinc deficiency commonly affects skin and hair.
Excess zinc may interfere with copper balance.
Yes, copper and iron are often assessed alongside zinc.
When long-term zinc status or hidden deficiency is suspected.
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