ORDERED that the interlocutory judgment is reversed insofar as appealed from, on the law, and the complaint is dismissed, and it is further,
ORDERED that the appeal from the order is dismissed as academic; and it is further,
ORDERED that the defendant is awarded one bill of costs.
On this record, there is no rational process by which the trier of fact could have found in favor of the plaintiffs (see, Dooley v. Skodneck, 138 A.D.2d 102 ; see also, Vigilant Ins. Co. v. Rippner Elec. Constr. Corp., 196 A.D.2d 494, 496 ; Jimenez v. Urban Universal Structures, 174 A.D.2d 604, 605 ).
"It is settled and unquestioned law that opinion evidence must be based on facts in the record or personally known to the witness" (Matter of Aetna Cas. Sur. Co. v. Barile, supra, 86 A.D.2d 362, 364 , quoting Cassano v. Hagstrom, 5 N.Y.2d 643, 646 ). An expert may not speculate and may not guess (see, Matter of Aetna Cas. Sur. Co. v. Barile, supra). Here, the testimony of the plaintiffs' expert witness as to the infant plaintiff's purported elevated blood lead level was equivocal at best and, at the very least, speculative. The expert never examined the infant plaintiff and was uncertain as to whether the blood test which resulted in the initially high reading was the admittedly unreliable "micro finger-stick" test.
Moreover, it was undisputed that a blood test administered only 11 days after the first test indicated a normal blood lead level of three micrograms per deciliter, and all of the experts agreed that a dramatic drop was unlikely, if not impossible, over such a short period of time. Moreover, all subsequent blood tests results (which the plaintiffs' expert had no reason to believe were not the result of the more accurate venous tests), indicated that the infant plaintiff's blood lead levels remained normal.
In light of the foregoing, we need not reach the contentions raised as to the issue of damages.
RITTER, J.P., THOMPSON, FEUERSTEIN, and SMITH, JJ., concur.