Tuesday's Health Winners & Losers

NutriSystem

(NTRI) - Get Report

plunged 10% in heavy trading as a long-running selloff in the weight-loss company accelerated. The stock has dropped 22% in two weeks as

technical sell signals have been struck. Shares dropped $4.83 to $53.01.

Odyssey Healthcare

(ODSY)

dropped 7% after the hospice operator issued subpar 2007 guidance. Shares fell $1 to $12.12.

ICU Medical

(ICUI) - Get Report

sank 6% after the critical care company issued disappointing guidance for the coming year. Shares slid $2.52 to $37.50.

Theragenics

(TGX)

soared 19% after swinging to a fourth-quarter profit. Shares rose 66 cents to $4.12.

Wyeth

(WYE)

dropped 2% after posting a 17% rise in fourth-quarter earnings. Shares fell 96 cents to $49.64.

Among healthcare stocks gaining ground Tuesday,

Amgen

(AMGN) - Get Report

rose 94 cents to $70.91,

Elan

(ELN)

added 13 cents to $12.43 and

Biogen

(BIIB) - Get Report

tacked on 33 cents to $48.01.

Among decliners,

Merck

(MRK) - Get Report

slid 55 cents to $44.96 and

Cephalon

(CEPH)

gave up 38 cents to $73.85.