¶ 1 Kenneth and Alexandria McClain, both minors, suffer from toxic lead poisoning. Appellants allege that the poisoning was due to the ingestion of lead-based paint found in their rental home. Juliet and Harvey Welker and Welker Real Estate, appellees, owned the rental unit. The trial court granted appellees’ motion in limine that sought to prohibit appellants’ expert from testifying as to issues of causation. After granting the motion, the trial court then granted appellees’ motion for non-suit. We reverse and remand for trial.
¶ 2 In 1991, pediatricians diagnosed the minor appellants as suffering from lead poisoning. At trial, appellants sought to introduce the testimony of Dr. Theodore Lidsky to show that the children experienced cognitive defects caused by the lead poisoning. Upon objection by the defense, the trial judge ruled that Dr. Lidsky’s proposed testimony regarding causation would be inadmissible. In its order denying post-trial relief, the trial judge ruled that since Dr. Lidsky did not possess a medical degree, he was not qualified to testify as to medical causation. Appellants now argue that the trial court erred in ruling that one must have a medical degree in order to testify in matters regarding organic causes and effects.
¶ 3 We recognize that our standard of review is very narrow.
The admission or exclusion of evidence, including the admission of testimony from an expert witness, is within the sound discretion of the trial court.... [W]e may only reverse upon a showing that the trial court clearly abused its discretion or committed an error of law. To constitute reversible error, an evi-dentiary ruling must not only be erroneous, but also harmful or prejudicial to the complaining party.
Turney Media Fuel, Inc. v. Toll Bros., Inc.,
¶ 4 In
Miller v. Brass Rail Tavern,
[i]t is well established in this Commonwealth that the standard for qualification of an expert witness is a liberal one. The test to be applied when qualifying an expert witness is whether the witness *157 has any reasonable pretension to specialized knowledge on the subject under investigation. If he does, he may testify and the weight to be given to such testimony is for the trial of fact to determine .... [Finally, it is not] necessary that an expert be a licensed medical practitioner to testify with respect to organic matters.
Id. at 528. Hence, our Supreme Court has permitted an otherwise qualified non-medical expert to give a medical opinion so long as the expert witness has sufficient specialized knowledge to aid the jury in its factual quest.
¶ 5 In the case at hand, the trial judge relied upon this Court’s decision in
Flanagan v. Labe,
¶ 6 In discussing its rationale, this Court in
Flanagan
noted several cases in which non-medical professionals did provide expert testimony, but were not permitted to testify regarding causation.
See id.
at 336-37 (citing
Simmons v. Mullen,
¶ 7 In the instant case, like the coroner in
Miller,
Dr. Lidsky “possesses more knowledge than is otherwise within the ordinary range of training, knowledge, intelligence or experience,” in his specialized fields of study.
Miller,
¶ 8 Because we have concluded that the trial court erred in preventing Dr. Lidsky from testifying as to the causation of the minor appellants’ cognitive dysfunction, the trial court’s entry of an order granting a non-suit becomes suspect. Our standard of review in determining the propriety of the entry of a non-suit is well settled:
[Entry] is proper only if the factfinder, viewing all the evidence in favor of the plaintiff, could not reasonably conclude that the essential elements of a cause of action have been established. When a nonsuit is entered, the lack of evidence to sustain the action must be so clear that it admits no room for fair and reasonable disagreement. A compulsory nonsuit can only be granted in cases where it is clear that a cause of action has not been established and the plaintiff must be given the benefit of all favorable evidence along with all reasonable inferences of fact arising from that evidence, resolving any conflict in the evidence in favor of the plaintiff. The fact-finder, however, cannot be permitted to reach a decision on the basis of speculation or conjecture.
Joyce v. Boulevard Therapy & Rehab. Ctr., P.C.,
¶ 9 Accordingly, the trial court’s order refusing to allow Dr. Lidsky to testify as to the causation of the cognitive defects is reversed, and this case is remanded for a trial consistent with this opinion. Jurisdiction is relinquished.
Notes
. The trial court's confusion on this issue is understandable, as many jurisdictions have come to differing conclusions. For opinions that collect inteijurisdictional decisions, compare
Hutchison v. American Family Mut. Ins. Co.,
. Appellants argue that the trial court erred in dismissing their entire case because, even without Dr. Lidsky's testimony, they could present a
prima facie
case regarding the children’s pain and suffering resulting from the lead poisoning.
See
Appellants' Brief, at 39. We decline to address this issue as our resolution of appellants' first issue makes this question moot. If we were to address this question, we would find it waived, as appellants have provided no analysis as is required under Pa.R.A.P. 2119(b).
See In re Hall,
