Version 2.77

Part Descriptions

Phenytoin-free levels detect the level of non-protein-bound phenytoin in the blood. It is used to measure therapeutic and toxic levels of the drug. Source: Regenstrief Institute

LP207910-3   free DRUG/TOX
The measurement of free (unbound) drug concentrations in plasma is important for certain drugs and has two advantages over measurement of total concentration: (1) the free concentration is independent of changes in plasma binding (e.g., due to changes in albumin), and (2) the free concentration is more directly related to both the efficacy and toxicity of the drug PMID: 6636249. For most drugs and the majority of patients, measuring the free and total concentrations is not necessary. However, for certain drugs, including some anticonvulsants and antibiotics, and specific patient populations, such as critically ill or immunosuppressed patients, the free concentration is a better indicator of therapeutic effect and potential toxicity. Source: Regenstrief LOINC

Fully-Specified Name


Additional Names

Short Name
Phenytoin Free MFr SerPl
Display Name
Phenytoin Free/Total phenytoin [Mass fraction]
Consumer Name Alpha Get Info
Free phenytoin/, Blood

Basic Attributes

First Released
Version 1.0i
Last Updated
Version 2.73
Order vs. Observation
Common Test Rank Get Info

Language Variants Get Info

Tag Language Translation
es-AR Spanish (Argentina) fenitoína.libre/fenitoíón de masa:punto en el tiempo:suero/plasma:cuantitativo:
es-ES Spanish (Spain) Fenitoína libre/Fenitoíón de masa:Punto temporal:Suero o Plasma:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Phenytoin.libre/ón de masa:Punto temporal:Suero o Plasma:Cuantitativo:
et-EE Estonian (Estonia) Fenütoiin.vaba/fenütoiin.üld:MFr:Pt:S/P:Qn:
Synonyms: Juhuslik Kvantitatiivne Plasma Seerum Seerum või plasma
fr-CA French (Canada) Phénytoïne.libre/Phénytoïne.totale:Fraction de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:
fr-FR French (France) Diphénylhydantoïne libre/diphénylhydantoïne totale:Fraction massique:Ponctuel:Sérum/Plasma:Numérique:
fr-BE French (Belgium) Phénytoïne.libre/Phénytoïne.totale:Fraction de masse:Temps ponctuel:Sérum/Plasma:Quantitatif:
it-IT Italian (Italy) Fenitoina.libera/Fenitoina.totale:MFr:Pt:Siero/Plasma:Qn:
Synonyms: Fenitoina Libera Frazione di massa Livelli farmacologici e tossicologia Plasma Punto nel tempo (episodio) Siero Siero o Plasma
ko-KR Korean (Korea, Republic Of) 유리페니토인/총페니토인:질량분획:검사시점:혈청/혈장:정량:
nl-NL Dutch (Netherlands) fenytoïne.vrij/fenytoïne.totaal:massafractie:moment:serum of plasma:kwantitatief:
pt-BR Portuguese (Brazil) Fenitoína.livre/Fenitoí
Synonyms: Diphenylhydantoin; Dilantin; DPH; Dilj; DI-HYDAN; Epanutin; Fenantoin; Lehydan; Phenhydan; Sinergina; Zentropil; Mass fraction; Percent; Point in time; Random; SerPl; SerPlas; SerP; Serum; SR; Plasma; Pl; Plsm; Quantitative; QNT; Quant; Quan; Drugs; Tot; Totl; FR; Non-protein bound; DRUG/TOXICOLOGY; DRUG/TOXICOLOGY
ru-RU Russian (Russian Federation) Фенитоин.свободный/Фенитоин.общий:МассДол:ТчкВрм:Сыв/Плаз:Колич:
Synonyms: Количественный Массовая доля Плазма Сыворотка Сыворотка или Плазма Точка во времени;Момент
tr-TR Turkish (Turkey) Fenitoin.serb/ütlFr:Zmlı:Ser/Plaz:Kant:
zh-CN Chinese (China) 苯妥英.游离型/苯妥英.总计:质量分数:时间点:血清/血浆:定量型:
Synonyms: C15H12N2O2;二苯乙内酰脲;苯妥营;二苯基乙内酰脲;二苯尿囊素 MFr 全体数量 全部 共计 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 总 总和 总数 总苯妥英;苯妥英.总;苯妥英总计;苯妥英(二苯乙内酰脲、二苯基乙内酰脲、二苯尿囊素、苯妥营).总计 总量 总额 时刻;随机;随意;瞬间 毒品 毒品类 汇总 游离 游离型苯妥英;游离苯妥英;苯妥英.游离;苯妥英(二苯乙内酰脲、二苯基乙内酰脲、二苯尿囊素、苯妥营).游离型 药品类 药物 药物/毒理学;药物/毒理学试验;药物毒理学试验;药物毒理学试验类 药物类 血清或血浆 非蛋白结合型 非蛋白质结合型

Example Units

Unit Source
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