{"title":"Vitamin D Health","description":"\u003ch2\u003eVitamin D testing: understanding your results\u003c\/h2\u003e\n\u003cp\u003eVitamin D helps the body absorb calcium and supports normal bone and muscle function. Your body produces vitamin D when skin is exposed to sunlight, and smaller amounts come from food and supplements. The amount you obtain can vary with the season, time spent outdoors, diet and individual circumstances.\u003c\/p\u003e\n\u003cp\u003eThis collection features a vitamin D test reporting vitamin D2, vitamin D3 and total vitamin D. Before ordering, review the product page for the sample requirements, what is measured and the instructions supplied with the kit. Testing provides a measurement to discuss with a healthcare professional; it does not explain every symptom or replace a clinical assessment.\u003c\/p\u003e\n\u003ch2\u003eWhen might testing be discussed?\u003c\/h2\u003e\n\u003cp\u003eA healthcare professional may consider vitamin D testing alongside your symptoms, medical history and other relevant information. Tiredness or muscle discomfort can have many explanations, so symptoms alone cannot confirm low vitamin D. Equally, a result should not be used on its own to decide whether another condition is present.\u003c\/p\u003e\n\u003ch2\u003ePreparing for your sample\u003c\/h2\u003e\n\u003cp\u003eFollow the instructions provided with your particular kit. Check the collection requirements before starting, complete the requested information and package your sample as directed. Tell your healthcare professional about supplements and prescribed medicines that may be relevant. Do not stop prescribed treatment or change your supplement dose solely to prepare for testing unless advised.\u003c\/p\u003e\n\u003ch2\u003eUnderstanding the next steps\u003c\/h2\u003e\n\u003cp\u003eReview your result together with its units and laboratory reference information. Your clinician can explain how it fits your circumstances and whether any further assessment is appropriate. Avoid assuming that a higher result is always better or choosing high supplement doses without advice. Ask for clarification if anything is unclear.\u003c\/p\u003e\n\u003cp\u003eUse the product details below to explore the available test and make an informed decision about whether it suits your needs.\u003c\/p\u003e","products":[{"product_id":"vitamin-d-testing-d2-and-d3-in-dried-blood-spots-25oh-total-blood","title":"Vitamin D Test (Vitamin D2, D3 and D Total) (LCMS)","description":"\u003cp\u003e\u003cstrong\u003eTest ID:\u003c\/strong\u003e B-223 Vitamin D Test (Vitamin D2, D3 and D Total) (LCMS) | \u003cstrong\u003eSample Type:\u003c\/strong\u003e Dried Blood Spot | \u003cstrong\u003eTest Method:\u003c\/strong\u003e LC-MS\/MS | \u003cstrong\u003eResults:\u003c\/strong\u003e 3–5 Working Days | \u003cstrong\u003eLaboratory:\u003c\/strong\u003e ZRT Laboratory – CLIA Certified | \u003cstrong\u003eReport:\u003c\/strong\u003e Specialist Doctor Comment Included | \u003cstrong\u003eSuitable For:\u003c\/strong\u003e Adults and Children | \u003cstrong\u003eCollect Sample At Home:\u003c\/strong\u003e No Clinic Visit Required\u003c\/p\u003e\u003ch2\u003eWhat Vitamin D Test Measures?\u003c\/h2\u003e\u003cp\u003eThis is one of the most precise Vitamin D tests available, using \u003cstrong\u003eLC-MS\/MS technology\u003c\/strong\u003e to independently measure both forms:\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVitamin D2 (Ergocalciferol)\u003c\/strong\u003e — the form found in plant-based foods and many supplements\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVitamin D3 (Cholecalciferol)\u003c\/strong\u003e — the form produced by sunlight and found in animal-based foods\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTotal Vitamin D (25-OH)\u003c\/strong\u003e — the calculated combined level used to assess overall Vitamin D status\u003c\/p\u003e\u003cp\u003eMeasuring D2 and D3 separately is important for anyone supplementing, as it shows exactly which form is contributing to your levels and whether your supplementation is working.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e25-OH Vitamin D Ranges\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eUnit:\u003c\/strong\u003e ng\/mL\u003c\/p\u003e\u003cp\u003eMarkerWomenMen25-OH Vitamin D2\u0026lt;4 ng\/mL*\u0026lt;4 ng\/mL*25-OH Vitamin D320–80 ng\/mL20–80 ng\/mL25-OH Vitamin D, Total20–80 ng\/mL20–80 ng\/mL\u003c\/p\u003e\u003cp\u003e*Applicable unless supplementing with vitamin D2.\u003c\/p\u003e\u003ch2\u003eCould Vitamin D Deficiency Be Behind Your Fatigue, Pain, or Low Mood?\u003c\/h2\u003e\u003cp\u003eVitamin D deficiency is one of the most widespread and underdiagnosed nutritional issues in the UK — affecting an estimated 1 in 5 adults. It often has no obvious symptoms, yet it silently increases the risk of serious health conditions. If you recognise any of the following, a Vitamin D test could be the missing piece:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePersistent fatigue or low energy that doesn’t improve with rest\u003c\/li\u003e\n\u003cli\u003eBone pain, aching joints, or muscle weakness\u003c\/li\u003e\n\u003cli\u003eFrequent illness or infections (low immunity)\u003c\/li\u003e\n\u003cli\u003eLow mood, depression, or seasonal mood changes\u003c\/li\u003e\n\u003cli\u003eHair loss or slow hair growth\u003c\/li\u003e\n\u003cli\u003eChronic back pain or musculoskeletal discomfort\u003c\/li\u003e\n\u003cli\u003eSpending most of your time indoors or living in the UK or northern latitudes\u003c\/li\u003e\n\u003cli\u003eDark skin tone (requires more sun exposure to produce Vitamin D)\u003c\/li\u003e\n\u003cli\u003eOverweight or obese (Vitamin D can become trapped in fat tissue)\u003c\/li\u003e\n\u003cli\u003eTaking Vitamin D supplements and unsure if your levels are optimal\u003c\/li\u003e\n\u003cli\u003eElderly or at risk of osteoporosis or fractures\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat Is Vitamin D and Why Does It Matter?\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eVitamin D\u003c\/strong\u003e is a prohormone — not just a vitamin — that plays a critical role in dozens of body systems. Most of it is produced by the skin in response to sunlight, with very little coming from diet alone. In the UK, low sunlight levels make deficiency extremely common, particularly in autumn and winter.\u003c\/p\u003e\u003cp\u003eResearch links Vitamin D deficiency to a wide range of serious conditions, including osteoporosis and increased fracture risk, cardiovascular disease and stroke, type 1 and type 2 diabetes, autoimmune conditions including multiple sclerosis and rheumatoid arthritis, depression and mood disorders, and chronic musculoskeletal pain.\u003c\/p\u003e\u003ch2\u003eWho Should Consider This Test?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePersistent fatigue, bone pain, muscle weakness, or low mood\u003c\/li\u003e\n\u003cli\u003eFrequent illness or low immunity\u003c\/li\u003e\n\u003cli\u003eLiving in the UK or spending limited time outdoors\u003c\/li\u003e\n\u003cli\u003eDark skin tone or overweight (both reduce Vitamin D synthesis)\u003c\/li\u003e\n\u003cli\u003eCurrently taking Vitamin D supplements and wanting to confirm optimal dosing\u003c\/li\u003e\n\u003cli\u003eElderly or at risk of osteoporosis\u003c\/li\u003e\n\u003cli\u003eAnyone wanting a precise D2 vs D3 breakdown rather than a total-only result\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eHow It Works\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003eOrder your kit — delivered to your door\u003c\/li\u003e\n\u003cli\u003eCollect your sample at home — a simple finger-prick dried blood spot; no clinic or GP visit needed\u003c\/li\u003e\n\u003cli\u003ePost your sample to ZRT Laboratory using the return instructions provided\u003c\/li\u003e\n\u003cli\u003eReceive your results by email within 3–5 working days of the lab receiving your sample\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003eWhat You Receive\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eYour D2, D3, and Total Vitamin D levels displayed clearly in graphics and numbers\u003c\/li\u003e\n\u003cli\u003eWritten interpretation by a Hormone Specialist PhD Doctor\u003c\/li\u003e\n\u003cli\u003eGuidance on whether your levels are deficient, low, or optimal, and what to do next\u003c\/li\u003e\n\u003cli\u003eLaboratory fee included — no hidden charges\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy We Use ZRT Laboratory\u003c\/h2\u003e\u003cp\u003eAll testing is performed by \u003cstrong\u003eZRT Laboratory\u003c\/strong\u003e — a globally recognised, \u003cstrong\u003eCLIA-certified\u003c\/strong\u003e diagnostic laboratory founded in 1998 by \u003cstrong\u003eDr. David Zava, PhD\u003c\/strong\u003e. ZRT has performed \u003cstrong\u003eover 11 million tests\u003c\/strong\u003e and is trusted by healthcare professionals in \u003cstrong\u003e96+ countries\u003c\/strong\u003e. ZRT’s LC-MS\/MS Vitamin D test independently measures D2 and D3 — a level of precision not available from standard immunoassay-based Vitamin D tests.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhy does this test measure D2 and D3 separately?\u003c\/strong\u003e\u003cbr\u003eMost standard Vitamin D tests only report a total 25-OH value. Measuring D2 and D3 separately shows which form is driving your total level — essential if you are supplementing, as D2 and D3 supplements have different potency and conversion rates.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the optimal Vitamin D level?\u003c\/strong\u003e\u003cbr\u003eOptimal levels are generally considered to be 32–100 ng\/mL. Levels below 20 ng\/mL indicate deficiency; levels below 32 ng\/mL are considered low. Your specialist report will interpret your result in context and advise on supplementation if appropriate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the price include the laboratory fee?\u003c\/strong\u003e\u003cbr\u003eYes. The full laboratory analysis fee is included. You are only responsible for posting your sample to the laboratory.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow long is the kit valid for?\u003c\/strong\u003e\u003cbr\u003eThe kit must be used within \u003cstrong\u003e12 months\u003c\/strong\u003e of the purchase date.\u003c\/p\u003e","brand":"Hormone Lab UK","offers":[{"title":"Default Title","offer_id":32921367689,"sku":"10012","price":139.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1885\/4859\/files\/Vitamin-D-Test-Vitamin-D2-D3-and-D-Total.webp?v=1792582700"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1885\/4859\/collections\/Vitamin_D_a768afaa-5131-459a-bdca-669b9cfab702-6726991.png?v=1792433946","url":"https:\/\/hormonelab.co.uk\/de\/collections\/vitamin-d.oembed","provider":"Hormone Lab UK","version":"1.0","type":"link"}