FRIEDMAN, Judge.
Somerset Welding and Steel (Employer) and Home Insurance Company (collectively, Petitioners) appeal from a decision of the Workmen’s Compensation Appeal Board (Board) [82]*82affirming a referee’s1 grant of benefits to Robert G. Lee, Jr. (Claimant) from March 27,1991 through February 6,1992 and reversing the referee’s termination of those benefits as of February 7, 1992.
On March 26, 1991, while working for Employer, Claimant slipped as he put together a water separator tank. Consequently, Claimant experienced pain in his back as well as burning pain in the back of his left leg.2 (Referee’s Finding of Fact, No. 4.) On March 27, 1991, Claimant’s wife informed Employer of the incident and told Employer that Claimant would be absent from work that day due to a doctor’s appointment. (Referee’s Findings of Fact, Nos. 5 and 17.) The next day, Employer terminated Claimant’s employment for continually disregarding company policy with regard to procedures for reporting off work. (Referee’s Findings of Fact, Nos. 6, 16 and 21.)
On May 15, 1991, Claimant filed a claim petition for workers’ compensation benefits, indicating that he suffered a herniated disc from the March 26th incident. Petitioners subsequently filed an answer to that petition generally denying Claimant’s allegations. At the evidentiary hearing, Claimant presented the deposition testimony of two physicians, Dr. Mark F. Yaros and Dr. Howard Gendell. Dr. Yaros testified that he examined Claimant on March 27, 1991. At that time, Claimant gave Dr. Yaros a “history” of left back pain radiating from Claimant’s upper lumbar spine through the hip and lateral aspect of his left leg to his knee and told Dr. Yaros that he had been experiencing back pain for two months. During that initial examination, Claimant did not inform Dr. Yaros of a specific incident precipitating the pain; however, Dr. Yaros stated that the Claimant’s symptoms and complaints were definitely different from any previous complaints. Dr. Yaros [83]*83deemed Claimant totally disabled as of April 1, 1991, the date on which diagnostic tests confirmed Claimant was suffering from a herniated disc.
Dr. Gendell testified that based on a myelogram, MRI, and examination results, Claimant suffered from low back and leg pain consistent with a herniated disc. Furthermore, Dr. Gendell stated that within a reasonable degree of medical certainty, the incident on March 26, 1991 caused a new injury or aggravated Claimant’s preexisting condition. Dr. Gendell, however, was unable to testify that Claimant continued to have a disability after February 6, 1992 and deferred such an opinion to Claimant’s rehabilitation physician.
Claimant did not offer any testimony or reports from his rehabilitation physician and neither party presented other medical witnesses.
The referee accepted the physicians’ testimonies and found Claimant totally disabled from March 27,1991 through February 6, 1992. The referee then terminated benefits effective February 7, 1992 because Claimant’s medical experts could not unequivocally establish a continuing disability after that date.
Both parties appealed. The Board held that Claimant presented unequivocal medical testimony supporting the existence of a work-related disability. However, the Board determined that the referee erred in placing the burden on Claimant to prove continuing disability and that, once Claimant established entitlement to benefits, the burden should have been on Petitioners to prove that Claimant had fully recovered from his disability. Because Petitioners failed to do so, the Board concluded that the referee improperly terminated benefits.
Petitioners now ask3 us to determine: (1) whether Claimant’s medical evidence is unequivocal, thereby supporting a [84]*84finding of causation between Claimant’s work-related incident and his disability; and (2) whether Claimant may receive benefits following the justifiable termination of his employment.
I.
Petitioners first argue that the testimony of Claimant’s medical witnesses was equivocal and, thus, could not provide the required causal link between the work-related incident and Claimant’s disability.
In a claim petition proceeding, a claimant must prove a causal relationship between a work-related. incident and a disability. Lewis v. Workmen’s Compensation Appeal Board (Pittsburgh Bd. of Educ.), 508 Pa. 360, 498 A.2d 800 (1985). Where, as here, an obvious causal connection between the disability and the alleged cause does not exist,4 the claimant can establish that connection through unequivocal medical testimony. Id. If such testimony is necessary, a claimant’s medical witnesses must testify that in their professional opinions, the disability resulted from the alleged cause, not that the injury “may have” resulted from the alleged cause. Id. If the testimony is based only upon possibilities, then that testimony is equivocal and not legally competent to establish a causal relationship. Id.
The determination as to whether expert testimony in a workers’ compensation proceeding is equivocal so as not to be competent evidence is a question of law, subject to our review. Cyclops Corp./Sawhill Tubular Div. v. Workmen’s Compensation Appeal Board (Paulsen), 158 Pa.Commonwealth Ct. 595, 632 A.2d 617 (1993). “In conducting such review the medical [85]*85witness’s entire testimony must be reviewed and taken as a whole and a final decision ‘should not rest upon a few words taken out of context of the entire testimony.’ ” Lewis, 508 Pa. at 366, 498 A.2d at 803, quoting Wilkes-Barre City v. Workmen’s Compensation Appeal Board, 54 Pa.Commonwealth Ct. 230, 420 A.2d 795 (1980).
First, Petitioners argue that Dr. Yaros testified as to possibilities, specifically that the alleged incident “may have caused” Claimant’s injury or “could have aggravated” a preexisting condition. We agree.
Here, Dr. Yaros testified that, within a reasonable degree of medical certainty, Claimant’s disability commenced on April 1, 1991; however, Dr. Yaros never stated unequivocally that the incident of March 26, 1991 caused Claimant’s back pain. At most, Dr. Yaros’ testimony, when taken in its entirety, establishes that “something” aggravated Claimant’s pre-existing back condition which could have been the work-related incident here.5 Therefore, we disagree with the Board’s determination that Dr. Yaros’ testimony was unequivocal.
Petitioners also maintain that Dr. Gendell’s testimony is equivocal because: (1) it is premised on the assumption that the “history” given to him was accurate, and (2) it is inconsistent. Here, we disagree.
[86]*86Dr. Gendell did base his medical opinion on the medical history provided by Claimant, stating that assuming the “history” he received as true, the work-related incident here either aggravated Claimant’s pre-existing back condition or caused a new injury. (R.R.
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FRIEDMAN, Judge.
Somerset Welding and Steel (Employer) and Home Insurance Company (collectively, Petitioners) appeal from a decision of the Workmen’s Compensation Appeal Board (Board) [82]*82affirming a referee’s1 grant of benefits to Robert G. Lee, Jr. (Claimant) from March 27,1991 through February 6,1992 and reversing the referee’s termination of those benefits as of February 7, 1992.
On March 26, 1991, while working for Employer, Claimant slipped as he put together a water separator tank. Consequently, Claimant experienced pain in his back as well as burning pain in the back of his left leg.2 (Referee’s Finding of Fact, No. 4.) On March 27, 1991, Claimant’s wife informed Employer of the incident and told Employer that Claimant would be absent from work that day due to a doctor’s appointment. (Referee’s Findings of Fact, Nos. 5 and 17.) The next day, Employer terminated Claimant’s employment for continually disregarding company policy with regard to procedures for reporting off work. (Referee’s Findings of Fact, Nos. 6, 16 and 21.)
On May 15, 1991, Claimant filed a claim petition for workers’ compensation benefits, indicating that he suffered a herniated disc from the March 26th incident. Petitioners subsequently filed an answer to that petition generally denying Claimant’s allegations. At the evidentiary hearing, Claimant presented the deposition testimony of two physicians, Dr. Mark F. Yaros and Dr. Howard Gendell. Dr. Yaros testified that he examined Claimant on March 27, 1991. At that time, Claimant gave Dr. Yaros a “history” of left back pain radiating from Claimant’s upper lumbar spine through the hip and lateral aspect of his left leg to his knee and told Dr. Yaros that he had been experiencing back pain for two months. During that initial examination, Claimant did not inform Dr. Yaros of a specific incident precipitating the pain; however, Dr. Yaros stated that the Claimant’s symptoms and complaints were definitely different from any previous complaints. Dr. Yaros [83]*83deemed Claimant totally disabled as of April 1, 1991, the date on which diagnostic tests confirmed Claimant was suffering from a herniated disc.
Dr. Gendell testified that based on a myelogram, MRI, and examination results, Claimant suffered from low back and leg pain consistent with a herniated disc. Furthermore, Dr. Gendell stated that within a reasonable degree of medical certainty, the incident on March 26, 1991 caused a new injury or aggravated Claimant’s preexisting condition. Dr. Gendell, however, was unable to testify that Claimant continued to have a disability after February 6, 1992 and deferred such an opinion to Claimant’s rehabilitation physician.
Claimant did not offer any testimony or reports from his rehabilitation physician and neither party presented other medical witnesses.
The referee accepted the physicians’ testimonies and found Claimant totally disabled from March 27,1991 through February 6, 1992. The referee then terminated benefits effective February 7, 1992 because Claimant’s medical experts could not unequivocally establish a continuing disability after that date.
Both parties appealed. The Board held that Claimant presented unequivocal medical testimony supporting the existence of a work-related disability. However, the Board determined that the referee erred in placing the burden on Claimant to prove continuing disability and that, once Claimant established entitlement to benefits, the burden should have been on Petitioners to prove that Claimant had fully recovered from his disability. Because Petitioners failed to do so, the Board concluded that the referee improperly terminated benefits.
Petitioners now ask3 us to determine: (1) whether Claimant’s medical evidence is unequivocal, thereby supporting a [84]*84finding of causation between Claimant’s work-related incident and his disability; and (2) whether Claimant may receive benefits following the justifiable termination of his employment.
I.
Petitioners first argue that the testimony of Claimant’s medical witnesses was equivocal and, thus, could not provide the required causal link between the work-related incident and Claimant’s disability.
In a claim petition proceeding, a claimant must prove a causal relationship between a work-related. incident and a disability. Lewis v. Workmen’s Compensation Appeal Board (Pittsburgh Bd. of Educ.), 508 Pa. 360, 498 A.2d 800 (1985). Where, as here, an obvious causal connection between the disability and the alleged cause does not exist,4 the claimant can establish that connection through unequivocal medical testimony. Id. If such testimony is necessary, a claimant’s medical witnesses must testify that in their professional opinions, the disability resulted from the alleged cause, not that the injury “may have” resulted from the alleged cause. Id. If the testimony is based only upon possibilities, then that testimony is equivocal and not legally competent to establish a causal relationship. Id.
The determination as to whether expert testimony in a workers’ compensation proceeding is equivocal so as not to be competent evidence is a question of law, subject to our review. Cyclops Corp./Sawhill Tubular Div. v. Workmen’s Compensation Appeal Board (Paulsen), 158 Pa.Commonwealth Ct. 595, 632 A.2d 617 (1993). “In conducting such review the medical [85]*85witness’s entire testimony must be reviewed and taken as a whole and a final decision ‘should not rest upon a few words taken out of context of the entire testimony.’ ” Lewis, 508 Pa. at 366, 498 A.2d at 803, quoting Wilkes-Barre City v. Workmen’s Compensation Appeal Board, 54 Pa.Commonwealth Ct. 230, 420 A.2d 795 (1980).
First, Petitioners argue that Dr. Yaros testified as to possibilities, specifically that the alleged incident “may have caused” Claimant’s injury or “could have aggravated” a preexisting condition. We agree.
Here, Dr. Yaros testified that, within a reasonable degree of medical certainty, Claimant’s disability commenced on April 1, 1991; however, Dr. Yaros never stated unequivocally that the incident of March 26, 1991 caused Claimant’s back pain. At most, Dr. Yaros’ testimony, when taken in its entirety, establishes that “something” aggravated Claimant’s pre-existing back condition which could have been the work-related incident here.5 Therefore, we disagree with the Board’s determination that Dr. Yaros’ testimony was unequivocal.
Petitioners also maintain that Dr. Gendell’s testimony is equivocal because: (1) it is premised on the assumption that the “history” given to him was accurate, and (2) it is inconsistent. Here, we disagree.
[86]*86Dr. Gendell did base his medical opinion on the medical history provided by Claimant, stating that assuming the “history” he received as true, the work-related incident here either aggravated Claimant’s pre-existing back condition or caused a new injury. (R.R. at 295A.) Contrary to Petitioner’s argument, medical causation testimony is not rendered equivocal because it is based on the medical expert’s assumption of the truthfulness of the information provided; however” the supposed facts forming the basis of that determination must be proven by competent evidence and accepted as true by the' referee. McGraw-Edison/Power Systems Div. v. Workmen’s Compensation Appeal Board, 62 Pa.Commonwealth Ct. 302, 436 A.2d 706 (1981).
Here, the referee found that Claimant injured himself on March 26, 1991 due to a work-related incident. That finding is supported by competent evidence within the record. (E.g., R.R.' at 27A-28A.)6 Furthermore, the referee found Dr. Gendell’s testimony to be credible.
Petitioners, however, note that Dr. Gendell’s conclusion that within reasonable medical certainty the work-related incident either aggravated a pre-existing back condition or had caused a new injury is inconsistent with portions of his testimony in [87]*87which he stated that the alleged incident could cause the Claimant’s present symptoms.7
“The rationalization of a witness’ testimony and the acceptance of those portions thereof on which to make findings and an award is the province of the referee, and is not a review prerogative of this Court.” Blue Bell Printing v. Workmen’s Compensation Appeal Board (Montgomery Publishing Co.), 115 Pa.Commonwealth Ct. 203, 207, 539 A.2d 933, 935 (1988). The appearance of inconsistencies in a medical expert’s testimony does not render that testimony equivocal. Wetterau, Inc. v. Workmen’s Compensation Appeal Board (Mihaljevich), 148 Pa.Commonwealth Ct. 55, 61, 609 A.2d 858, 861 (1992). In fact, Dr. Gendell never contradicted himself by testifying that the work-related incident did not cause Claimant’s disability. When taken as a whole, Dr. Gendell’s testimony indicates that within a reasonable degree of medical certainty the incident caused a new injury or an aggravation of a pre-existing condition. Thus, Claimant presented unequivocal medical testimony of causation.8
[88]*88II.
Next, Petitioners argue that the Board inappropriately affirmed the referee’s award of benefits because Claimant’s loss of earnings since March 28, 1991 resulted from Claimant’s justifiable discharge for disregarding company policy and was not the result of a work-related injury.
In United Parcel Service v. Workmen’s Compensation Appeal Board (Portanova), 140 Pa.Commonwealth Ct. 626, 594 A.2d 829 (1991), we held that when a claimant is discharged because of misconduct which occurred prior to his injury, the claimant’s loss of earnings is deemed to have resulted from disability due to injury. However, if a claimant commits misconduct after the injury and is properly discharged for that conduct, then he is precluded from receiving compensation for loss of earnings from the date of his termination. See Wells-Moore v. Workmen’s Compensation Appeal Board (McNeil Consumer Products Co.), 144 Pa.Commonwealth Ct. 382, 601 A.2d 879 (1992); see also Woodard v. Workmen’s Compensation Appeal Board (Koppers) 49 Pa.Commonwealth Ct. 558, 411 A.2d 890 (1980).
Here, the referee found that Claimant’s injury occurred prior to the termination of his employment. Therefore, Claimant’s loss of earnings resulted from a disability due to an injury9 which consequently entitled him to benefits as of March 27, 1991. However, on March 28, 1991, Employer justifiably terminated Claimant’s employment because of Claimant’s history of misconduct, with the last event occurring after the injury. Thus, Claimant’s loss of earnings beginning March 28,1991 resulted from his discharge and his compensation for loss of earnings should have been suspended on that date. Moreover, that suspension should have continued for the period of his disability.
[89]*89As to the length of Claimant’s disability, Petitioners note that the Board erred by reversing the referee’s termination of benefits as of February 7, 1992 and placing the burden of disproving Claimant’s continuing disability with Petitioners. We agree.
A referee can determine the period of a claimant’s disability and award benefits accordingly even though the employer has not filed a termination petition. Thomas v. Workmen’s Compensation Appeal Board (George’s Painting Contractors), 157 Pa.Commonwealth Ct. 207, 629 A.2d 251 (1993). Moreover, the burden of proof remains with the claimant to demonstrate not only that he has sustained a compensable injury but also that the injury continues to cause disability throughout the pendency of the claim petition proceeding. Inglis House v. Workmen’s Compensation Appeal Board (Reedy), 535 Pa. 135, 634 A.2d 592 (1993); Innovative Spaces v. Workmen’s Compensation Appeal Board (DeAngelis), 166 Pa.Commonwealth Ct. 141, 646 A.2d 51 (1994).
After February 6, 1992, Claimant failed to meet that burden because he did not produce unequivocal medical opinion that his disability continued after that date. (Referee’s Finding of Fact, Nos. 13, 14, and 15.) Thus, the referee properly terminated benefits as of February 7, 1992.
Accordingly, Claimant is entitled to full benefits for March 27,199110 and medical expenses incurred from March 27,1991 through February 6, 1992, although he is not entitled to compensation for loss of earnings from March 28, 1991 through February 6, 1992. 77 P.S. § 514; see Odd Fellow’s Home of Pennsylvania v. Workmen’s Compensation Appeal Board (Cook), 144 Pa.Commonwealth Ct. 280, 601 A.2d 465 (1991). Moreover, Claimant’s benefits are terminated as of February 7, 1992. Therefore, we affirm the Board’s order as to Claimant’s entitlement to benefits, reverse the order as to [90]*90the termination of benefits, vacate as to the period of entitlement and remand the case to the Board for computation of benefits consistent with this opinion.
ORDER
AND NOW, this 11th day of October, 1994, the order of the Workmen’s Compensation Appeal Board, entered November 29,1993, at A 93-0490, is affirmed as to Claimant’s entitlement to benefits, reversed as to the termination of benefits, and vacated as to the period of entitlement. Accordingly, we remand this case to the Board for computation of benefits consistent with this opinion.
Jurisdiction relinquished.