{"id":63859,"date":"2014-05-14T12:54:09","date_gmt":"2014-05-14T10:54:09","guid":{"rendered":"https:\/\/badamysie.pl\/produkt\/25-hydroxyvitamin-d-25-oh-test\/"},"modified":"2026-10-10T22:39:00","modified_gmt":"2026-10-10T20:39:00","slug":"25-hydroxyvitamin-d-25-oh-test","status":"publish","type":"product","link":"https:\/\/badamysie.pl\/en\/produkt\/25-hydroxyvitamin-d-25-oh-test\/","title":{"rendered":"25-hydroxyvitamin D (25 OH) &#8211; vitamin D test"},"content":{"rendered":"<div class=\"bm-kv\">\n<div><b>Where<\/b>any sample collection centre listed in the basket<\/div>\n<div><b>Results turnaround time<\/b>up to 2 working days<\/div>\n<div><b>Sample<\/b>venous blood (serum)<\/div>\n<div><b>Preparation<\/b>fasting is not required<\/div>\n<\/div>\n<h2>Why vitamin D is tested<\/h2>\n<p>The test measures the concentration of 25-hydroxyvitamin D (calcidiol, 25(OH)D), the form in which vitamin D circulates in the blood and which best reflects its stores from skin synthesis, diet and supplements. Vitamin D supports calcium and phosphate absorption, bone mineralisation and muscle function; deficiency causes rickets in children and osteomalacia and osteoporosis in adults, and is also associated with reduced immunity and persistent tiredness.<\/p>\n<p>In Poland, deficiency is common from October to April because the angle of sunlight prevents synthesis in the skin. The result helps determine a suitable supplement dose instead of taking one without knowing your level.<\/p>\n<h2>When to consider this test<\/h2>\n<ul>\n<li>before starting supplementation and around 3 months afterwards, then once a year,<\/li>\n<li>for bone and muscle pain, weakness, frequent infections or fractures after minor injury,<\/li>\n<li>in people who are overweight or obese, pregnant, over 65 or have little sun exposure,<\/li>\n<li>in kidney and liver disease, malabsorption disorders (coeliac disease, Crohn&#8217;s disease) or osteoporosis,<\/li>\n<li>during long-term treatment with glucocorticoids, antiepileptic medicines or immunosuppressants.<\/li>\n<\/ul>\n<p>Polish guidelines do not recommend testing the whole population; testing is strongly recommended for people in risk groups.<\/p>\n<h2>How to prepare<\/h2>\n<ul>\n<li>Fasting is not required. Drink a glass of water around 30 minutes before sample collection.<\/li>\n<li>If you take vitamin D supplements, do not stop them before the test; note the dose and tell your doctor when discussing the result.<\/li>\n<li>If you take high-dose biotin (hair and nail supplements), stop it for one day before the test; it may distort results obtained using immunoassays.<\/li>\n<\/ul>\n<h2>Understanding your result<\/h2>\n<p>Results are reported in ng\/ml (sometimes in nmol\/l; 1 ng\/ml = 2,5 nmol\/l). Thresholds according to the Polish guidelines from 2023:<\/p>\n<table>\n<tr>\n<th>25(OH)D<\/th>\n<th>Interpretation<\/th>\n<th>What the doctor usually does<\/th>\n<\/tr>\n<tr>\n<td>up to 20 ng\/ml<\/td>\n<td>deficiency<\/td>\n<td>treatment doses, repeat testing after 1\u20133 months<\/td>\n<\/tr>\n<tr>\n<td>20\u201330 ng\/ml<\/td>\n<td>suboptimal level<\/td>\n<td>increase the dose, repeat testing after about 6 months<\/td>\n<\/tr>\n<tr>\n<td>30\u201350 ng\/ml<\/td>\n<td>optimal concentration<\/td>\n<td>preventive dose, annual testing<\/td>\n<\/tr>\n<tr>\n<td>50\u2013100 ng\/ml<\/td>\n<td>high concentration<\/td>\n<td>reduce the dose<\/td>\n<\/tr>\n<tr>\n<td>above 100 ng\/ml<\/td>\n<td>risk of toxicity<\/td>\n<td>stop supplementation, measure calcium in blood and urine, test monthly until the level falls below 50 ng\/ml<\/td>\n<\/tr>\n<\/table>\n<p>A low result alone is not a disease, but a signal to correct the deficiency. If the result is above 100 ng\/ml, the doctor checks calcium, as this determines the symptoms of toxicity.<\/p>\n<h2>Other tests to consider alongside vitamin D<\/h2>\n<p>When investigating bone health and calcium metabolism, the doctor usually also requests <a href=\"\/en\/?s=wap\u0144&amp;post_type=product\">calcium<\/a>, <a href=\"\/en\/?s=fosfor&amp;post_type=product\">phosphate<\/a> and <a href=\"\/en\/?s=parathormon&amp;post_type=product\">parathyroid hormone (PTH)<\/a>; for tiredness and weakness, also <a href=\"\/en\/?s=morfologia&amp;post_type=product\">full blood count<\/a>, <a href=\"\/en\/?s=ferrytyna&amp;post_type=product\">ferritin<\/a> and <a href=\"\/en\/?s=TSH&amp;post_type=product\">TSH<\/a>. Read more about deficiency and dosing: <a href=\"https:\/\/www.badania-medyczne.pl\/?s=witamina+D\">Badania-Medyczne.pl<\/a>.<\/p>\n<div class=\"bm-faq\">\n<h2>Frequently asked questions<\/h2>\n<details>\n<summary>Do I need to fast for a vitamin D test?<\/summary>\n<p>No. You can eat a light meal. The result does not depend on the time of day, although morning blood collection is usually most convenient.<\/p>\n<\/details>\n<details>\n<summary>What is a normal vitamin D result?<\/summary>\n<p>According to the Polish guidelines from 2023, the optimal 25(OH)D concentration is 30\u201350 ng\/ml. A result of 20 ng\/ml or below indicates deficiency, 20\u201330 ng\/ml a suboptimal level and above 100 ng\/ml a risk of toxicity.<\/p>\n<\/details>\n<details>\n<summary>When should I repeat the test after starting supplementation?<\/summary>\n<p>For people aged 11 and over, repeat testing is performed after 8\u201312 weeks, no later than 3 months. Once the dose has been established, annual testing is sufficient.<\/p>\n<\/details>\n<\/div>\n<p class=\"bm-src\">Sources: <a href=\"https:\/\/www.alab.pl\/badanie\/witamina-d-25oh\" rel=\"noopener\">ALAB laboratoria, Vitamin D3 metabolite 25(OH) (preparation, turnaround time, interpretation thresholds)<\/a>; <a href=\"https:\/\/www.mdpi.com\/2072-6643\/15\/3\/695\" rel=\"noopener\">P\u0142udowski P. et al., Guidelines for Preventing and Treating Vitamin D Deficiency, Nutrients 2023 (Polish guidelines, 25(OH)D thresholds, monitoring)<\/a>. For information only; does not replace medical advice.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A test to measure vitamin D (calcidiol) levels.<\/p>\n<p>&nbsp;<\/p>\n<p id=\"docs-internal-guid-a8f8950c-fa74-bb1a-7d71-0d8faf256fd0\" dir=\"ltr\">\n","protected":false},"featured_media":63861,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[2230],"product_tag":[],"class_list":["post-63859","product","type-product","status-publish","has-post-thumbnail","product_cat-other-laboratory-tests","first","instock","sale","virtual","sold-individually","taxable","purchasable","product-type-simple"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Measure your vitamin D level with a 25-hydroxyvitamin D blood test. 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