As he was thought to have anemia of chronic disease based on iron studies at OSH, possible renal contribution so he received erythropoeitin.
 He has an elevated creatinine
(ROOT (FRAG (SBAR (IN As) (S (NP (PRP he)) (VP (VBD was) (VP (VBN thought) (S (VP (TO to) (VP (VB have) (NP (NP (NN anemia)) (PP (IN of) (NP (JJ chronic) (NN disease)))) (PP (VBN based) (PP (IN on) (NP (NN iron) (NNS studies)))) (PP (IN at) (NP (NNP OSH)))))))))) (, ,) (NP (NP (JJ possible) (JJ renal) (NN contribution)) (SBAR (IN so) (S (NP (PRP he)) (VP (VBD received) (NP (NN erythropoeitin)))))) (. .)))
(ROOT (S (NP (PRP He)) (VP (VBZ has) (NP (DT an) (JJ elevated) (NN creatinine)))))
( ( As ( he ( was ( thought ( to ( ( ( have ( anemia ( of ( chronic disease ) ) ) ) ( based ( on ( iron studies ) ) ) ) ( at OSH ) ) ) ) ) ) ) ( , ( ( ( possible ( renal contribution ) ) ( so ( he ( received erythropoeitin ) ) ) ) . ) ) )
( He ( has ( an ( elevated creatinine ) ) ) )