{"id":"hdl-p","name":"HDL Particle Number (HDL-P)","shortName":"HDL-P","aliases":["HDL Particle Number","HDL-P","Total HDL-P","HDL Particles","HDL Particle Concentration","HDL-P (Total)","HDL Particle Count","HDL Particle Number (NMR)","HDL-P (NMR)","Total HDL Particles","HDL Particles (Total)","HDL PARTICLE NUMBER","High Density Lipoprotein Particle Number"],"abbreviations":["HDL-P"],"loinc":[{"code":"49748-7","primary":true}],"specimen":"serum-or-plasma","units":[{"ucum":"umol/L","display":"µmol/L"},{"ucum":"nmol/L","display":"nmol/L"}],"referenceRanges":[{"population":"Adults","low":30.5,"high":null,"unit":"umol/L","unitDisplay":"µmol/L","note":"Labcorp prints 'greater than or equal to 30.5 µmol/L' on its NMR LipoProfile. 30.5 is the 50th percentile (median) of Labcorp's reference group of 4,588 men and women without known heart disease or diabetes and not on lipid medication, so about half of that group falls below it (25th percentile 26.7, 75th percentile 34.9 µmol/L). It is a cutoff on a risk scale, not the central 95% of healthy people. Ion mobility tests from other labs count particles by a different method, so no range is encoded for them.","sources":[{"title":"NMR LipoProfile+Lipids+Graph, sample patient report (test 123810)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/123810.pdf","publisher":"Labcorp","year":2024},{"title":"NMR LipoProfile With Lipids (With Graph) (Labcorp test 123810)","url":"https://www.labcorp.com/tests/123810/nmr-lipoprofile-with-lipids-with-graph","publisher":"Labcorp","year":2026}]},{"population":"Men, 18+","low":30.1,"high":null,"unit":"umol/L","unitDisplay":"µmol/L","note":"Mayo Clinic Laboratories prints 'greater than 30 µmol/L' for men 18 and older. It is stored as 30.1 so that a result of exactly 30 falls outside it. Mayo has no values for younger people. Compare your result with the range printed on your own report.","sources":[{"title":"Nuclear Magnetic Resonance Lipoprotein Profile, Serum (test NMRLP)","url":"https://www.testcatalog.org/show/NMRLP","publisher":"Mayo Clinic Laboratories","year":2026}]},{"population":"Women, 18+","low":35.1,"high":null,"unit":"umol/L","unitDisplay":"µmol/L","note":"Mayo Clinic Laboratories prints 'greater than 35 µmol/L' for women 18 and older. It is stored as 35.1 so that a result of exactly 35 falls outside it. Women usually run higher than men, which is why Mayo's cutoff for women is higher than Labcorp's single cutoff.","sources":[{"title":"Nuclear Magnetic Resonance Lipoprotein Profile, Serum (test NMRLP)","url":"https://www.testcatalog.org/show/NMRLP","publisher":"Mayo Clinic Laboratories","year":2026}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The number of HDL particles in your blood, counted by NMR. It sits beside HDL cholesterol, which measures the cholesterol those particles carry.","url":"https://bloodtesttracker.com/markers/hdl-p","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}