STEINBERG, J.,
After being treated at the scene of a two-car accident in the City of Allentown, the defendant has been charged with driving under the influence of a controlled substance1 and possession of drug paraphernalia.2 The defendant motions to suppress the statements she made at the scene and the evidence recovered. The defense also challenges the Commonwealth’s prima facie case by petitioning for a writ of habeas corpus, and motions to preclude the Commonwealth’s expert from testifying to the degree of the defendant’s impairment due to her use of heroin.
At an evidentiary hearing on defendant’s motion, the Commonwealth presented the testimony of Michael Matchette, a seven-year member of the Allentown Emergency Medical Service, Dr. Dean Fritch, a forensic toxicologist, and Officer Michael Billera, a six-year member of the Allentown Police Department. Based on this testimony, the transcript of the preliminary hearing,3 and the legal arguments of the parties, we make the following findings of fact and conclusions of law.
On August 18, 2001, at approximately 10:23 p.m., Officers Kristopher Vogt and Michael Billera responded to the scene of a two vehicle accident at 40th and Tilghman Street in the City of Allentown.4 The defendant’s car had rear-ended another vehicle that was [4]*4stopped at a red light.5 The defendant and her sister were trapped in their vehicle, which had sustained major front-end damage, and were being attended by paramedics.6 The defendant was in the front driver’s seat, and although she was covered in blood, she was conscious.7
After Emergency Medical Technician Michael Matchette treated the defendant, stabilized her, and placed her in a cervical collar, he asked if she had consumed any alcohol.8 The defendant indicated that she had not been drinking, but said that she had used heroin,9 although she could not remember exactly how many hours earlier.10 The defendant was then removed from the vehicle, strapped to a backboard and treated in the ambulance, where Officer Billera asked her if she had consumed any alcohol or drugs. She repeated to Officer Billera that she had used heroin, and admitted that she had a syringe in her pants pocket.11 A pair of scissors was utilized to cut the defendant’s pants pocket, and a bank envelope wrapped around an uncapped syringe was recovered.12 The defendant was then transported to the hospital where she was treated and blood was drawn. The defendant’s blood tested positive for heroin, yielding a result of 325 nanograms per milliliter total morphine.13
[5]*5The defense motions to suppress the defendant’s admission that she used heroin on the night in question, arguing that she was not given Miranda warnings. The Fifth Amendment protection against self-incrimination guaranteed by Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966), is only triggered when an individual is subject to custodial interrogation. Commonwealth v. Thompson, 778 A.2d 1215, 1221 (Pa. Super. 2001). Officer Billera’s questioning of the defendant in the ambulance14 did not necessitate Miranda warnings, as the defendant was not in custody or subject to interrogation.
“[Pjolice detentions become custodial when, under the totality of the circumstances, the conditions and/or duration of the detention become so coercive as to constitute the functional equivalent of arrest.” Commonwealth v. Mannion, 725 A.2d 196, 200 (Pa. Super. 1999). The standard for determining whether a suspect [6]*6has been subject to custodial detention or the functional equivalent of a formal arrest is an objective one based upon a totality of the circumstances. Commonwealth v. Gwynn, 555 Pa. 86, 98, 723 A.2d 143, 148 (1998). The Pennsylvania Superior Court has stated in Commonwealth v. Turner, 772 A.2d 970 (Pa. Super. 2001):
“The factors that the court considers to determine whether there has been a custodial interrogation include: the basis for the detention; its length; its location; whether the suspect was transported against his or her will, how far and why; whether restraints were used; whether the law enforcement officer showed, threatened or used force; and the investigative methods employed to confirm or dispel suspicions.” 772 A.2d 970, 973 (Pa. Super. 2001).
Although the defendant was strapped to a backboard and suffering from accident-related injuries, she was not in custody when Officer Billera asked her if she had consumed any alcohol or drugs. In Commonwealth v. Perry, 710 A.2d 1183, 1186 (Pa. Super. 1998), the court found that questioning by a police officer of the defendant, who was intoxicated, injured and awaiting treatment in a hospital emergency room, was proper where the questioning was the result of proper police investigative procedure. The court held that the questioning was not lengthy and the defendant’s presence in an emergency room did not de facto place him in custody. Id.
In Commonwealth v. Fento, 363 Pa. Super. 488, 494, 526 A.2d 784, 787 (1987), the court also held that the defendant was not in custody during his interview with a police officer in his hospital room. The court focused on the fact that “the only restraints placed on appellee [7]*7were created by his own medical condition as the result of the accident rather than any coercive action on the part of [the trooper]. Any restraint applied in this case was for medical purposes by medical personnel rather than investigative purposes by police officers.” Id. (emphasis added) As in Fento, she was not in custody, and Miranda, the defendant in the case sub judice could have expected her detention to last only as long as medically necessary, see id., and was restrained only by her medical condition. For those reasons, we find that she was not in custody and Miranda warnings were not necessary.15
[8]*8The defendant’s argument that the physical evidence was the fruit of an unlawful custodial interrogation fails in light of our determination that her statements are admissible and that she volunteered the information that she had a syringe in her pants pocket. Additionally, the defendant’s admission to heroin use defeats her argument that the police had no probable cause or reasonable suspicion to test her blood for controlled substances.
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STEINBERG, J.,
After being treated at the scene of a two-car accident in the City of Allentown, the defendant has been charged with driving under the influence of a controlled substance1 and possession of drug paraphernalia.2 The defendant motions to suppress the statements she made at the scene and the evidence recovered. The defense also challenges the Commonwealth’s prima facie case by petitioning for a writ of habeas corpus, and motions to preclude the Commonwealth’s expert from testifying to the degree of the defendant’s impairment due to her use of heroin.
At an evidentiary hearing on defendant’s motion, the Commonwealth presented the testimony of Michael Matchette, a seven-year member of the Allentown Emergency Medical Service, Dr. Dean Fritch, a forensic toxicologist, and Officer Michael Billera, a six-year member of the Allentown Police Department. Based on this testimony, the transcript of the preliminary hearing,3 and the legal arguments of the parties, we make the following findings of fact and conclusions of law.
On August 18, 2001, at approximately 10:23 p.m., Officers Kristopher Vogt and Michael Billera responded to the scene of a two vehicle accident at 40th and Tilghman Street in the City of Allentown.4 The defendant’s car had rear-ended another vehicle that was [4]*4stopped at a red light.5 The defendant and her sister were trapped in their vehicle, which had sustained major front-end damage, and were being attended by paramedics.6 The defendant was in the front driver’s seat, and although she was covered in blood, she was conscious.7
After Emergency Medical Technician Michael Matchette treated the defendant, stabilized her, and placed her in a cervical collar, he asked if she had consumed any alcohol.8 The defendant indicated that she had not been drinking, but said that she had used heroin,9 although she could not remember exactly how many hours earlier.10 The defendant was then removed from the vehicle, strapped to a backboard and treated in the ambulance, where Officer Billera asked her if she had consumed any alcohol or drugs. She repeated to Officer Billera that she had used heroin, and admitted that she had a syringe in her pants pocket.11 A pair of scissors was utilized to cut the defendant’s pants pocket, and a bank envelope wrapped around an uncapped syringe was recovered.12 The defendant was then transported to the hospital where she was treated and blood was drawn. The defendant’s blood tested positive for heroin, yielding a result of 325 nanograms per milliliter total morphine.13
[5]*5The defense motions to suppress the defendant’s admission that she used heroin on the night in question, arguing that she was not given Miranda warnings. The Fifth Amendment protection against self-incrimination guaranteed by Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966), is only triggered when an individual is subject to custodial interrogation. Commonwealth v. Thompson, 778 A.2d 1215, 1221 (Pa. Super. 2001). Officer Billera’s questioning of the defendant in the ambulance14 did not necessitate Miranda warnings, as the defendant was not in custody or subject to interrogation.
“[Pjolice detentions become custodial when, under the totality of the circumstances, the conditions and/or duration of the detention become so coercive as to constitute the functional equivalent of arrest.” Commonwealth v. Mannion, 725 A.2d 196, 200 (Pa. Super. 1999). The standard for determining whether a suspect [6]*6has been subject to custodial detention or the functional equivalent of a formal arrest is an objective one based upon a totality of the circumstances. Commonwealth v. Gwynn, 555 Pa. 86, 98, 723 A.2d 143, 148 (1998). The Pennsylvania Superior Court has stated in Commonwealth v. Turner, 772 A.2d 970 (Pa. Super. 2001):
“The factors that the court considers to determine whether there has been a custodial interrogation include: the basis for the detention; its length; its location; whether the suspect was transported against his or her will, how far and why; whether restraints were used; whether the law enforcement officer showed, threatened or used force; and the investigative methods employed to confirm or dispel suspicions.” 772 A.2d 970, 973 (Pa. Super. 2001).
Although the defendant was strapped to a backboard and suffering from accident-related injuries, she was not in custody when Officer Billera asked her if she had consumed any alcohol or drugs. In Commonwealth v. Perry, 710 A.2d 1183, 1186 (Pa. Super. 1998), the court found that questioning by a police officer of the defendant, who was intoxicated, injured and awaiting treatment in a hospital emergency room, was proper where the questioning was the result of proper police investigative procedure. The court held that the questioning was not lengthy and the defendant’s presence in an emergency room did not de facto place him in custody. Id.
In Commonwealth v. Fento, 363 Pa. Super. 488, 494, 526 A.2d 784, 787 (1987), the court also held that the defendant was not in custody during his interview with a police officer in his hospital room. The court focused on the fact that “the only restraints placed on appellee [7]*7were created by his own medical condition as the result of the accident rather than any coercive action on the part of [the trooper]. Any restraint applied in this case was for medical purposes by medical personnel rather than investigative purposes by police officers.” Id. (emphasis added) As in Fento, she was not in custody, and Miranda, the defendant in the case sub judice could have expected her detention to last only as long as medically necessary, see id., and was restrained only by her medical condition. For those reasons, we find that she was not in custody and Miranda warnings were not necessary.15
[8]*8The defendant’s argument that the physical evidence was the fruit of an unlawful custodial interrogation fails in light of our determination that her statements are admissible and that she volunteered the information that she had a syringe in her pants pocket. Additionally, the defendant’s admission to heroin use defeats her argument that the police had no probable cause or reasonable suspicion to test her blood for controlled substances. Therefore, we are left to determine whether the Commonwealth has presented a prima facie case, and whether their expert, Dr. Fritch, can testify as to whether the defendant’s driving was impaired from her use of heroin.
At the pretrial motions hearing, the Commonwealth presented evidence that the defendant’s blood tested positive for heroin, yielding a result of 325 nanograms per milliliter total morphine.16 The defense motioned to preclude the Commonwealth’s witness, Dr. Dean ■ Fritch, a forensic toxicologist, from interpreting those results at trial, arguing that “[a]ny opinion which seeks to interpret and extrapolate a certain level of a controlled substance metabolite in the blood stream back to the time of operation of a vehicle to determine a level of impairment or intoxication to a degree rendering the driver incapable of safe driving does not meet the general acceptance standard (Frye test) for scientific evidence. . . .” Defense omnibus pretrial motion at ¶12. Although the defense cites the test set forth in Frye v. [9]*9United States, 293 F. 1013 (D.C. Cir. 1923), a full Frye hearing was not requested in the motion or at the pretrial hearing.
We agree with the defense that there is no standard in Pennsylvania for the level of a controlled substance in the blood that would render a person incapable of safely operating her vehicle.17 While .10 percent blood alco[10]*10hol concentration is the standard set in Pennsylvania for the amount of alcohol in the blood which would render a person incapable of safely driving their vehicle, see 75 Pa. C.S. §3731(a)(4)(i) (“A person shall not drive, operate or be in actual physical control of the movement of a vehicle in any of the following circumstances ... [wjhile the amount of alcohol by weight in the blood of an adult is 0.10 percent or greater”), no standard exists against which the defendant’s blood test result of 325 nanograms per milliliter of morphine18 can be measured. Therefore, we direct our inquiry to whether Dr. Fritch can generally testify as to the defendant’s driving impairment based on the level of morphine in her blood.
We note that the standard by which we are measuring the admissibility of this expert testimony is different at this preliminary proceeding than it will be at trial. At a preliminary hearing, the Commonwealth need not prove its case beyond a reasonable doubt, but must only present a prima facie case. Commonwealth v. Saunders, 456 Pa. Super. 741, 745, 691 A.2d 946, 948 (1997), appeal denied, 550 Pa. 703, 705 A.2d 1307 (1997). Therefore, at this stage the mere introduction of the blood test is enough to prove a prima facie case, see Commonwealth v. Rick, 244 Pa. Super. 33, 366 A.2d 302 (1976) (chemist’s report which would have been inadmissible on its own at trial was sufficient for a prima [11]*11facie case at preliminary hearing), and the Commonwealth will face a heavier burden in terms of getting their expert testimony admitted at trial. See id. at 36-37, 366 A.2d at 303-304 (“the difference in purpose between a preliminary hearing and a trial dictates a different enforcement of the rules of evidence.”). Therefore, we do not preclude the Commonwealth from calling Dr. Fritch as an expert witness at trial to interpret the results of the morphine in the defendant’s blood to formulate a basis for a scientifically acceptable opinion on driving impairment. Whether this testimony may be admitted under the Frye standard as set forth in Commonwealth v. Topa, 471 Pa. 223, 369 A.2d 1277 (1977), and its progeny is a question to be addressed at trial or a full Frye hearing. See Rick, supra. We do note, however, that the Commonwealth will have to introduce at a Frye hearing evidence of general acceptance of impairment levels pertaining to controlled substances, to wit, heroin, in the scientific disciplines. It will be incumbent upon the Commonwealth through the use of scientific texts, journals, or the testimony of experts to demonstrate that impairment is reached at the levels suggested by Dr. Fritch. The testimony introduced at the pretrial hearing19 does not provide sufficient scien[12]*12tifie support to allow this court to conclude that Dr. Fritch’s conclusions have been generally accepted in the relevant scientific community,20 or even supported by judicial authority. However, the Commonwealth is not required to do so until a full Frye hearing is held.
[13]*13Therefore, for the foregoing reasons, the defendant’s omnibus pretrial motions must be denied.
ORDER
And now, May 22, 2002, upon consideration of the omnibus pretrial motion of defendant Christine Hausman, and after a hearing on the motion, for the reasons stated in the accompanying memorandum opinion;
It is hereby ordered that the motion to suppress statements is denied;
It is further ordered that the motion to suppress physical evidence is denied;
It is further ordered that the motion to preclude expert testimony is denied without prejudice subject to a full Frye hearing;
It is further ordered that the petition for writ of habeas corpus is denied.