Correct

空腹

/ kōngfù / 
Strokes

Definition

an empty stomach

Example

As a Verb

be on an empty stomach

1
Kōngfù
空腹
chōuxuè
抽血
huàyàn
化验

take a blood test on an empty stomach

2
Kōngfù
空腹
chīyào
吃药

take medicines on an empty stomach