PER CURIAM.
Big Horn Coal Company (Big Horn) petitions this court to review a final order of a Department of Labor Benefits Review Board (Board) affirming an Order of an administrative law judge (ALJ) awarding disability benefits to Edward Temple (Temple), an employee of Big Horn, under the Black Lung Benefits Act, 30 U.S.C. §§ 901-945 (the Act). Jurisdiction of this court to review the Board’s Order arises under 33 U.S.C. § 921(c) as incorporated into the Act by 30 U.S.C. § 932(a).
Temple was employed as a surface coal miner by Big Horn Coal Company of Sheridan, Wyoming, from 1940 until his retirement on January 1, 1978. Before his retirement, Temple filed a claim for benefits under the Act on May 28, 1976. On June 2, 1977, the Department of Labor’s Claims Examiner informally denied Temple’s claim because neither the X-ray report nor the ventilatory study showed pneumoconiosis under the applicable regulations. (Dir. Exh. 12.)
On March 1, 1978, the Act was amended. The Department of Labor (DOL) re-opened and reviewed Temple’s original application under new regulations implementing the 1978 amendments. (Dir. Exh. 3.) On February 8, 1979, the DOL reversed its informal denial and ruled that Temple was entitled to benefits under the Act. (Dir. Exh. 14.) By letter dated February 13, 1979, Big Horn generally controverted Temple’s claim and requested a hearing. (Dir. Exh. 16.)
A hearing was held in Sheridan, Wyoming, before an ALJ on July 23, 1980. On January 20, 1981, the ALJ issued a Decision and Order finding that Temple had pneumoconiosis under the interim presumption in 20j C.F.R. § 727.203(a)(3), which provides:
(a) Establishing interim presumption. A miner who engaged in coal mine employment for at least 10 years will be presumed to be totally disabled due to [1167]*1167pneumonconiosis, or to have been totally disabled due to pneumoconiosis at the time of death, or death will be presumed to be due to pneumoconiosis, arising out of that employment, if one of the following medical requirements is met: ******
(3) Blood gas studies which demonstrate the presence of an impairment in the transfer of oxygen from the lung alveoli to the blood as indicated by values which are equal to or less than the values specified in the following table____
The AU specifically found that “a P.C.0.2 of 31 and a P.O.2 of 57 at rest and a P.C.O.2 of 32 and a P.O.2 of 67 upon exercise satisfies the applicable criteria necessary to invoke the presumption contemplated by § 727.203.” (R. Vol. I, p. 82).
After finding the “interim presumption” triggered, the AU determined whether or not Big Horn had rebutted the presumption under section 727.203(b):
(b) Rebuttal of interim presumption. In adjudicating a claim under this sub-part, all relevant medical evidence shall be considered. The presumption in paragraph [20 CFR § 727.203(a)] shall be rebutted if:
(1) The evidence establishes that the individual is, in fact, doing his usual coal mine work or comparable and gainful work ...; or
(2) In light of all relevant evidence it is established that the individual is able to do his usual coal mine work or comparable and gainful work ...; or
(3) The evidence establishes that the total disability or the death of the miner did not arise in whole or in part out of coal mine employment; or
(4) The evidence establishes that the miner does not, or did not, have pneumo-coniosis.
20 C.F.R. § 727.203(b). The AU ruled that Big Horn failed to rebut the interim presumption under any of these methods. He specifically found as follows:
There can be no question but that this 68-year old retired miner with a long term record of exposure to dust in his many years of coal mine employment has “pneumoconiosis” as that term is defined by § 727.202. Dr. Seymour Thickman testified that Mr. Temple had “pneumo-coniosis.” Dr. James J. Batty stated that he had “chronic bronchitis.” Dr. Frederick A. Mathews, a specialist in Radiology, testified that the films of Mr. Temple’s lungs were “compatible with pneumoconiosis.” There was no medical evidence that would allow me to find that Mr. Temple did not have “any chronic pulmonary disease resulting in respiratory or pulmonous impairment significantly related, or aggravated by dust exposure in coal mine employment.” (§ 727.202.)
The only serious defense to this claim is the employer’s contention to the effect that Mr. Temple can still do his usual coal mine work. This only remaining element of an attempted rebuttal of the presumption in claimant’s favor was put to rest by the testimony of George Nu-gent, the General Manager for Peter Kiewit Son’s, Inc. (the operator of Big Horn) from 1943 until 1975. Mr. Nugent testified that Mr. Temple was a “working foreman” who could no longer “continue the physical exertion that a person would have being a mine superintendent where you really have to put in a lot of time and a lot of physical effort” (Tr. 81).
(R., Vol. I, p. 83.) The AU therefore awarded benefits to Temple and ordered Big Horn to pay them. On February 12, 1981, Big Horn appealed the AU’s Decision and Order to the DOL’s Benefits Review Board. On December 13, 1984, the Board entered its Decision and Order affirming the AU.
Big Horn raises several issues in its petition to review the Board’s Decision and Order. We need to address, however, only the following dispositive issue: whether the Board erred in approving the AU’s evaluation of the arterial blood gas tests without considering the effect of altitude, age, and weight. /
Big Horn argues that even if the interim presumption is valid, the AU failed to con[1168]*1168sider the rebuttal evidence it offered concerning altitude, age, and weight. Specifically, the AU ignored testimony by Dr. Hoyer, a physician who reviewed and commented on Temple’s 1979 ABG test results, and whose testimony Big Horn contends rebutted the section 727.203(a)(3) interim presumption. The Director of the Office of Workers’ Compensation Programs, DOL (Director) maintains that while the table values in section 727.203(a)(3) are not adjusted for altitude and age, “These factors are, instead, .considered on rebuttal, together with all other medical evidence relating to the cause or interpretation of the blood gas test results.” (Director’s Response Brief, p. 8.)
The Director concedes that the AU erred in failing to consider Dr. Hoyer’s analysis on rebuttal: “Dr. Hoyer found that the test did not establish a pulmonary abnormality in light of the post-exercise results, the age of the miner, and the altitude at which the test was performed; Dr. Thickman, in contrast, found that the arterial blood gas test results reflected a significant abnormality.
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PER CURIAM.
Big Horn Coal Company (Big Horn) petitions this court to review a final order of a Department of Labor Benefits Review Board (Board) affirming an Order of an administrative law judge (ALJ) awarding disability benefits to Edward Temple (Temple), an employee of Big Horn, under the Black Lung Benefits Act, 30 U.S.C. §§ 901-945 (the Act). Jurisdiction of this court to review the Board’s Order arises under 33 U.S.C. § 921(c) as incorporated into the Act by 30 U.S.C. § 932(a).
Temple was employed as a surface coal miner by Big Horn Coal Company of Sheridan, Wyoming, from 1940 until his retirement on January 1, 1978. Before his retirement, Temple filed a claim for benefits under the Act on May 28, 1976. On June 2, 1977, the Department of Labor’s Claims Examiner informally denied Temple’s claim because neither the X-ray report nor the ventilatory study showed pneumoconiosis under the applicable regulations. (Dir. Exh. 12.)
On March 1, 1978, the Act was amended. The Department of Labor (DOL) re-opened and reviewed Temple’s original application under new regulations implementing the 1978 amendments. (Dir. Exh. 3.) On February 8, 1979, the DOL reversed its informal denial and ruled that Temple was entitled to benefits under the Act. (Dir. Exh. 14.) By letter dated February 13, 1979, Big Horn generally controverted Temple’s claim and requested a hearing. (Dir. Exh. 16.)
A hearing was held in Sheridan, Wyoming, before an ALJ on July 23, 1980. On January 20, 1981, the ALJ issued a Decision and Order finding that Temple had pneumoconiosis under the interim presumption in 20j C.F.R. § 727.203(a)(3), which provides:
(a) Establishing interim presumption. A miner who engaged in coal mine employment for at least 10 years will be presumed to be totally disabled due to [1167]*1167pneumonconiosis, or to have been totally disabled due to pneumoconiosis at the time of death, or death will be presumed to be due to pneumoconiosis, arising out of that employment, if one of the following medical requirements is met: ******
(3) Blood gas studies which demonstrate the presence of an impairment in the transfer of oxygen from the lung alveoli to the blood as indicated by values which are equal to or less than the values specified in the following table____
The AU specifically found that “a P.C.0.2 of 31 and a P.O.2 of 57 at rest and a P.C.O.2 of 32 and a P.O.2 of 67 upon exercise satisfies the applicable criteria necessary to invoke the presumption contemplated by § 727.203.” (R. Vol. I, p. 82).
After finding the “interim presumption” triggered, the AU determined whether or not Big Horn had rebutted the presumption under section 727.203(b):
(b) Rebuttal of interim presumption. In adjudicating a claim under this sub-part, all relevant medical evidence shall be considered. The presumption in paragraph [20 CFR § 727.203(a)] shall be rebutted if:
(1) The evidence establishes that the individual is, in fact, doing his usual coal mine work or comparable and gainful work ...; or
(2) In light of all relevant evidence it is established that the individual is able to do his usual coal mine work or comparable and gainful work ...; or
(3) The evidence establishes that the total disability or the death of the miner did not arise in whole or in part out of coal mine employment; or
(4) The evidence establishes that the miner does not, or did not, have pneumo-coniosis.
20 C.F.R. § 727.203(b). The AU ruled that Big Horn failed to rebut the interim presumption under any of these methods. He specifically found as follows:
There can be no question but that this 68-year old retired miner with a long term record of exposure to dust in his many years of coal mine employment has “pneumoconiosis” as that term is defined by § 727.202. Dr. Seymour Thickman testified that Mr. Temple had “pneumo-coniosis.” Dr. James J. Batty stated that he had “chronic bronchitis.” Dr. Frederick A. Mathews, a specialist in Radiology, testified that the films of Mr. Temple’s lungs were “compatible with pneumoconiosis.” There was no medical evidence that would allow me to find that Mr. Temple did not have “any chronic pulmonary disease resulting in respiratory or pulmonous impairment significantly related, or aggravated by dust exposure in coal mine employment.” (§ 727.202.)
The only serious defense to this claim is the employer’s contention to the effect that Mr. Temple can still do his usual coal mine work. This only remaining element of an attempted rebuttal of the presumption in claimant’s favor was put to rest by the testimony of George Nu-gent, the General Manager for Peter Kiewit Son’s, Inc. (the operator of Big Horn) from 1943 until 1975. Mr. Nugent testified that Mr. Temple was a “working foreman” who could no longer “continue the physical exertion that a person would have being a mine superintendent where you really have to put in a lot of time and a lot of physical effort” (Tr. 81).
(R., Vol. I, p. 83.) The AU therefore awarded benefits to Temple and ordered Big Horn to pay them. On February 12, 1981, Big Horn appealed the AU’s Decision and Order to the DOL’s Benefits Review Board. On December 13, 1984, the Board entered its Decision and Order affirming the AU.
Big Horn raises several issues in its petition to review the Board’s Decision and Order. We need to address, however, only the following dispositive issue: whether the Board erred in approving the AU’s evaluation of the arterial blood gas tests without considering the effect of altitude, age, and weight. /
Big Horn argues that even if the interim presumption is valid, the AU failed to con[1168]*1168sider the rebuttal evidence it offered concerning altitude, age, and weight. Specifically, the AU ignored testimony by Dr. Hoyer, a physician who reviewed and commented on Temple’s 1979 ABG test results, and whose testimony Big Horn contends rebutted the section 727.203(a)(3) interim presumption. The Director of the Office of Workers’ Compensation Programs, DOL (Director) maintains that while the table values in section 727.203(a)(3) are not adjusted for altitude and age, “These factors are, instead, .considered on rebuttal, together with all other medical evidence relating to the cause or interpretation of the blood gas test results.” (Director’s Response Brief, p. 8.)
The Director concedes that the AU erred in failing to consider Dr. Hoyer’s analysis on rebuttal: “Dr. Hoyer found that the test did not establish a pulmonary abnormality in light of the post-exercise results, the age of the miner, and the altitude at which the test was performed; Dr. Thickman, in contrast, found that the arterial blood gas test results reflected a significant abnormality. While the Administrative Law Judge erred in failing to consider these conflicting opinions on rebuttal, this error is harmless.” {Director’s Response Brief, p. 17 (footnote omitted).) The Director concludes that this error was harmless because even had the AU considered Dr. Hoyer’s analysis, his analysis could not legally establish rebuttal. Id. Relying on the Benefits Review Board’s decision in Martino v. United States Fuel Co., 6 Black Lung Rep. 1-33 (1983), Big Horn argues that the AU’s failure to consider Dr. Hoyer’s testimony as rebuttal evidence is reversible error.
In Martino, as in this case, the Board rejected a challenge to the validity and constitutionality of the section 727.203(a)(3) interim presumption because the table standards were not adjusted for altitude. The Board held: “If a blood gas study meets the table standards, then it is qualifying regardless of the altitude at which it was conducted.” Id. at 1-42. The Board, however, went on to explain that the AU must consider rebuttal evidence regarding the effect of altitude and other factors on the ABG test results:
Although altitude may not be considered for invocation of the presumption, it is nonetheless relevant for rebuttal of the interim presumption. Section 727.203(b) provides that, “[i]n adjudicating a claim under this subpart, all relevant medical evidence shall be considered.” 20 C.F.R. § 727.203(b). Blood gas tests are relevant medical evidence because they measure the existence and extent of an impairment in the transfer of oxygen from the lung alveoli to the blood. Because these tests concern impairment, they are particularly relevant to rebuttal pursuant to Section 727.-203(b)(2). This section provides that the presumption shall be rebutted if “[i]n light of all relevant evidence, it is established that the individual is able to do his usual coal mine work or comparable and gainful work ... [.]” 20 C.F.R. § 727.-203(b)(2). The presumption may be rebutted under Section 727.203(b)(2) by proving that the miner’s respiratory or pulmonary impairment is either non-existent or not totally disabling---- If a blood gas study produces abnormal results which can be attributed to altitude rather than pathogenic dysfunction, then this evidence is relevant to either the existence or extent of disablity due to a respiratory or pulmonary impairment. Consequently, the effect of altitude on arterial oxygen pressure is relevant medical evidence which the factfinder must consider if introduced____
******
The effect of altitude on arterial oxygen pressure is a medical determination which must be made by a physician____ Without a physician’s opinion, the fact-finder would be unable to make a rational evaluation of the relationship between altitude and the claimant’s blood gas test results or draw any inferences from this information concerning the claimant’s im[1169]*1169pairment. It is therefore held that a medical opinion which attributes a claimant’s blood gas test results to altitude rather than a pulmonary or respiratory impairment is relevant rebuttal evidence concerning work capability and must be considered by the factfinder under Section 727.203(b)(2).
Id. at 1-42 to 1-43 (citations and footnotes omitted) (emphasis added).
In Martino, the Board required the AU to consider rebuttal evidence attributing an ABG test result to altitude or other factors. In this case the Director concedes that the AU failed to consider the medical testimony of Dr. Hoyer. Yet the Director argues that the AU’s failure to consider this testimony was harmless error because Dr. Hoyer’s opinion is, by itself, not enough to rebut the interim presumption.. The Director, however, cannot deny that the Benefits Review Board has clearly stated that such a medical opinion is significant when evaluated with other evidence and must be considered by the factfinder.
“Agencies are under an obligation to follow their own regulations, procedures, and precedents, or provide a rational explanation for their departures.” National Conservative Political Action Committee v. FEC, 626 F.2d 953, 959 (D.C. Cir.1979). See also, Midwestern Transportation, Inc. v. ICC, 635 F.2d 771, 777 (10th Cir.1980). No rational explanation was given by the Board for departing from Martino. Therefore, in light of the Board’s Martino decision, we hold that it was reversible error for the AU not to consider Dr. Hoyer’s testimony as rebuttal evidence. We decline to determine the proper weight to be given Dr. Hoyer’s testimony in the first instance based on the record before us. Under Martino, this is the responsibility of the AU. We deny enforcement of the Board’s Order and remand for further proceedings consistent with this opinion.
ENFORCEMENT DENIED and REMANDED.