{"id":"basophils-absolute","name":"Basophils (Absolute)","shortName":"Basophils (abs)","aliases":["Absolute Basophils","Basos (Absolute)","Baso#","Basophils #","Absolute Basophil Count","Baso (Absolute)","Basophils Abs","Baso Abs","Basophil count","Basophils, Absolute","Basophil Absolute","Baso Absolute","ABSOLUTE BASOPHILS","Absolute Basophil","Basophil Count, Absolute","Basophils (Absolute Count)","Basophils Absolute Count","Basophil #","Basophil Number","Basos Abs","Basófilos Absolutos","Basophile absolut"],"abbreviations":["BASO#"],"loinc":[{"code":"704-7","primary":true},{"code":"705-4","primary":false},{"code":"26444-0","primary":false}],"specimen":"whole-blood","units":[{"ucum":"10*3/uL","display":"×10³/µL"},{"ucum":"10*9/L","display":"×10⁹/L"},{"ucum":"/uL","display":"cells/µL"},{"ucum":"/mm3","display":"cells/mm³"}],"referenceRanges":[{"population":"18+","low":0,"high":0.2,"unit":"10*3/uL","unitDisplay":"×10³/µL","note":"Labcorp (above 17 years) and NSW Health Pathology both list 0.0 to 0.2, and StatPearls describes basophilia as a count above about 0.2. Some labs use a lower limit: ARUP and Manchester 0.0 to 0.1, Mayo 0.01 to 0.08 for adults, and a textbook table 0 to 0.15. Automated and microscope basophil counts can disagree at low levels, and many labs print only one decimal, so most healthy results show as 0.0 or 0.1. Use the range printed on your own report first.","sources":[{"title":"Pediatric Testing Reference Ranges (test 005009, CBC With Differential/Platelet)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp Diagnostics"},{"title":"Sample patient report, test 005013 (CBC with Diff, Platelet, NLR)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/005013.pdf","publisher":"Labcorp"},{"title":"NSW Health Pathology: Adult Reference Intervals (CPROAH Reference Ranges Adult)","url":"https://www.seslhd.health.nsw.gov.au/sites/default/files/2019-04/NSWHP%20Reference%20Ranges%20Adult%202019.pdf","publisher":"NSW Health Pathology","year":2019},{"title":"CBC with Platelet Count and Automated Differential (test 0040003), hotline effective March 1, 2021: reference intervals","url":"https://ltd.aruplab.com/api/ltd/hotline/0040003/44232","publisher":"ARUP Laboratories","year":2021},{"title":"Haematology User Guide: Blood counts reference ranges","url":"https://mft.nhs.uk/app/uploads/2024/07/Blood-counts-reference-ranges.pdf","publisher":"Manchester University NHS Foundation Trust","year":2024},{"title":"Complete Blood Cell Count (CBC) with Differential, Blood (test ID CBC): reference values","url":"https://www.mayocliniclabs.com/test-catalog/overview/9109","publisher":"Mayo Clinic Laboratories"},{"title":"Normal Values for Leukocyte Concentration in Blood (Table 63-1)","url":"https://download.skyscape.com/download/ota/lonestar/76CD77F7-898A-4928-AE45-A3D54D0FF0F0/harrisons.ed19/content/HTML/c/tu13.htm","publisher":"Harrison's Principles of Internal Medicine, 19th edition (McGraw-Hill)","year":2015},{"title":"Basophilia","url":"https://www.ncbi.nlm.nih.gov/books/NBK535365/","publisher":"StatPearls (NCBI Bookshelf)","year":2024},{"title":"Blood basophil numbers in chronic ordinary urticaria and healthy controls: diurnal variation, influence of loratadine and prednisolone and relationship to disease activity","url":"https://pubmed.ncbi.nlm.nih.gov/12614448/","publisher":"Clinical and Experimental Allergy","year":2003}]}],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"The number of basophils, the rarest white blood cell, in each microliter of your blood. Basophils take part in allergic reactions.","url":"https://bloodtesttracker.com/markers/basophils-absolute","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}