Coombs test was positive, and the serum haptoglobin was less than 0.6.
 patient has a positive coomb's test
(ROOT (S (S (NP (NNP Coombs) (NN test)) (VP (VBD was) (ADJP (JJ positive))) (, ,)) (CC and) (S (NP (DT the) (NN serum) (NN haptoglobin)) (VP (VBD was) (NP (QP (JJR less) (IN than) (CD 0.6))))) (. .)))
(ROOT (S (NP (NN patient)) (VP (VBZ has) (NP (NP (DT a) (JJ positive) (NN coomb) (POS 's)) (NN test)))))
( ( ( ( ( Coombs test ) ( ( was positive ) , ) ) and ) ( ( the ( serum haptoglobin ) ) ( was ( less ( than 0.6 ) ) ) ) ) . )
( patient ( has ( ( a ( positive ( coomb 's ) ) ) test ) ) )