MyBloodTest
Biomarkers
Home
›
Biomarkers
›
Phenytoin
Blood
Phenytoin
Also known as: Dilantin Level, Phenytoin Total
COMMON RANGE
10 – 20
µg/mL
9
21
M
Mayo Clinic Laboratories
Adult
↗
See all sources ↓
CONVERT & COMPARE
µg/mL
=
15
mcg/mL
=
15
ug/mL
Reference ranges across 10+ sources
Adult reference ranges from 3 entries across 3 named sources, shown in µg/mL. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
M
Mayo Clinic Laboratories
All
≥18y
10 – 20 µg/mL
↗
L
Labcorp
All
≥18y
10 – 20 µg/mL
↗
Q
Quest Diagnostics
All
≥18y
10 – 20 µg/mL
↗
M
Mayo Clinic Laboratories
All · ≥18y
↗
10 – 20 µg/mL
L
Labcorp
All · ≥18y
↗
10 – 20 µg/mL
Q
Quest Diagnostics
All · ≥18y
↗
10 – 20 µg/mL
Related biomarkers
Often tested alongside phenytoin or part of the same panel.
White Blood Cells (WBC)
Blood
Red Blood Cells (RBC)
Blood
Hemoglobin (Hgb)
Blood
Hematocrit (Hct)
Blood
Platelets (PLT)
Blood
Mean Corpuscular Volume (MCV)
Blood
Sources
M
Mayo Clinic Laboratories
L
Labcorp
Q
Quest Diagnostics
Last updated 2026-05-02
This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.
Track your phenytoin in MyBloodTest
Instant lab report scanning, personalized wellness insights, automatic wellness app syncing. All in one app.
Download on the
App Store
Get it on
Google Play
Free · iOS · Android · Web
MyBloodTest
© 2026 Joelis labs, UAB. All rights reserved.