BNP was elevated at 7882.
 BNP levels are normal
(ROOT (S (NP (NN BNP)) (VP (VBD was) (VP (JJ elevated) (PP (IN at) (NP (CD 7882))))) (. .)))
(ROOT (S (NP (NN BNP) (NNS levels)) (VP (VBP are) (ADJP (JJ normal)))))
( BNP ( ( was ( elevated ( at 7882 ) ) ) . ) )
( ( BNP levels ) ( are normal ) )