Table 2 Warfarin sensitivity based on genotypes and three ranges of recommended warfarin doses (mg/week) from the USA FDA drug label (COUMADIN, Reference ID: 3022954).

From: Clinical Model for Predicting Warfarin Sensitivity

VKORC1

CYP2C9

*1/*1

*1/*2

*1/*3

*2/*2

*2/*3

*3/*3

G/G

Normal

(35–49)

Normal

(35–49)

Sensitive

(21–28)

Sensitive

(21–28)

Sensitive

(21–28)

Very Sensitive

(3.5–14)

A/G

Normal

(35–49)

Sensitive

(21–28)

Sensitive

(21–28)

Sensitive

(21–28)

Very Sensitive

(3.5–14)

Very Sensitive

(3.5–14)

A/A

Sensitive

(21–28)

Sensitive

(21–28)

Very Sensitive

(3.5–14)

Very Sensitive

(3.5–14)

Very Sensitive

(3.5–14)

Very Sensitive

(3.5–14)

  1. Ranges are derived from multiple published clinical studies. VKORC1-1639G > A (rs9923231) variant is used in this table. Other co-inherited VKORC1 variants may also be important determinants of warfarin dose.
  2. Doses were multiplied by 7 to provide consistent units of milligrams per week.