Vitamin A (Retinol)
Private Vitamin A (Retinol) testing in London for £99, measuring one retinol marker with results expected in around 8 days.
Turnaround time
8 business days
Biomarkers count
1
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Overview of the Vitamin A (Retinol) Blood Test
The Vitamin A blood test measures Retinol, the principal circulating form of Vitamin A used to assess nutritional Vitamin A status.
The test assesses 1 nutritional biomarker: Vitamin A (Retinol).
Vitamin A is a fat-soluble vitamin required for vision, immune function, reproduction, cellular differentiation and maintenance of healthy epithelial tissues.
One of its best-known roles is in the visual cycle.
Significant deficiency can impair the eye's ability to adapt to low light and eventually cause more serious ocular disease.
Vitamin A is obtained as preformed Retinol from animal foods and as provitamin A carotenoids from plant foods.
The liver stores substantial quantities of Vitamin A.
This means blood concentrations can remain relatively stable until body stores become significantly depleted.
Clinically important deficiency is therefore more likely in people with severe dietary deficiency or fat-malabsorption disorders.
Pancreatic insufficiency, cholestatic disease, intestinal disease and some gastrointestinal surgery can increase risk.
Excess is also important because Vitamin A accumulates within the body.
Long-term excessive intake of preformed Vitamin A can cause liver toxicity, bone effects, headache and other adverse outcomes.
High-dose Retinol supplements are also particularly important during pregnancy because excessive preformed Vitamin A can harm fetal development.
The test should therefore guide measured supplementation rather than encourage indiscriminate high-dose use.
What Does the Vitamin A (Retinol) Blood Test Check ?
The test measures circulating Retinol as a marker of Vitamin A nutritional status. This test measures 1 biomarker.
Vitamin A (Retinol)
Measures circulating Retinol, supporting assessment of Vitamin A deficiency, malabsorption or excessive supplementation.
Who May Benefit From the Vitamin A (Retinol) Blood Test?
Vitamin A testing can be useful where deficiency risk, malabsorption or high supplementation requires objective assessment.
People with fat-malabsorption disorders - Vitamin A requires normal intestinal fat absorption.
People with pancreatic or biliary disease - Reduced fat digestion or bile availability can impair absorption.
People with unexplained night-vision problems under clinical assessment - Severe Vitamin A deficiency can impair dark adaptation.
People following highly restrictive diets - Very low dietary intake can contribute to deficiency.
People taking high-dose Vitamin A supplements - Testing can help identify excessive exposure.
People after bariatric or gastrointestinal surgery - Nutritional monitoring can be important.
People with previous low Vitamin A results - Repeat testing can assess correction.
People undergoing broader fat-soluble vitamin assessment - Vitamins A, D, E and K can be affected together by malabsorption.
How to Prepare
Do not take extra Vitamin A immediately before testing.
High-dose preformed Vitamin A can be toxic and requires particular caution during pregnancy.
Symptoms and Reasons to Consider the Vitamin A (Retinol) Blood Test
Significant Vitamin A deficiency can affect vision, skin and epithelial tissues.
Poor night vision - Difficulty adapting to darkness is a recognised feature of deficiency.
Dry eyes or significant ocular dryness - Vitamin A supports normal ocular epithelial tissues.
Dry or rough skin with nutritional risk - Deficiency can affect epithelial health.
Known fat malabsorption - Reduced absorption raises the risk of deficiency.
Restricted dietary intake - Severe nutritional limitation can lower Vitamin A stores.
High-dose Retinol supplementation - Testing can help assess the possibility of excessive exposure.
Visual symptoms require appropriate eye assessment and should not automatically be attributed to Vitamin A.
Pregnant people should avoid high-dose preformed Vitamin A supplements unless specifically prescribed.
How to Book Your Vitamin A (Retinol) Blood Test in London
The Vitamin A test can be booked privately for focused nutritional assessment.
Choose the Vitamin A (Retinol)
Select the individual Vitamin A blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where suitable.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Your serum undergoes measurement of Vitamin A (Retinol).
Receive your results securely
Your authorised result is delivered securely and can be interpreted alongside diet, supplements and other nutritional markers.
When Will I Receive My Results?
The current live London Blood Tests page lists a turnaround of approximately 8 days after laboratory receipt for Vitamin A (Retinol).
This is a specialist nutritional assay.
The specimen undergoes Retinol analysis, quality-control procedures and laboratory authorisation before release.
Understanding Your Results
A low Vitamin A result can indicate reduced Retinol status.
This becomes particularly relevant where there is malabsorption, severe nutritional restriction or compatible clinical findings.
A result within range suggests the measured circulating Retinol concentration is within the laboratory's expected interval.
Because the liver stores Vitamin A, circulating Retinol does not always fall immediately when body stores begin to decline.
A high result can occur with excessive supplementation.
Chronic high intake of preformed Vitamin A can produce toxicity and should not be ignored.
The result should be interpreted with supplement dose, liver health, dietary intake and clinical context.
Why Book With London Blood Tests?
London Blood Tests provides private Vitamin A testing for focused nutritional assessment.
Measures circulating Retinol - The test assesses the principal circulating form of Vitamin A.
Relevant to visual health - Severe deficiency can affect dark adaptation and ocular tissues.
Useful in malabsorption - Fat-soluble vitamins can become low when intestinal fat absorption is impaired.
Can identify excessive supplementation - Vitamin A can accumulate and become toxic at high intakes.
Can complement other fat-soluble vitamins - Vitamins D, E and K can provide additional nutritional information.
Specialist laboratory analysis - Samples undergo dedicated Retinol measurement.
Professional blood collection - Clinic and suitable home or hotel appointments are available.
Clear pricing - The Vitamin A (Retinol) test costs £99.
Private Vitamin A (Retinol) Blood Test in London
London Blood Tests provides private Vitamin A testing for people requiring assessment of Retinol status.
The test costs £99 and measures 1 nutritional biomarker.
Results are expected approximately 8 days after laboratory receipt.
The result can help identify deficiency or excessive supplementation when interpreted alongside dietary and clinical information.