it. Porch v. Chater, 115 F.3d 567, 571 (8th Cir.1997). The ALJ must apply a sequential analysis to determine if a claimant is disabled, specifically whether the claimant is not currently working and has a severe impairment; whether this impairment meets or equals a listed impairment; if not, whether the impairment prevents the claimant from returning to his past relevant work; and, if so, whether the impairment prevents the claimant from performing other work in light of his age, education, and past work experience. 20 C.F.R. § 416.920. Further, it is the ALJ’s duty to investigate a claim presented at the time of the application or offered at the hearing as a basis for disability. Gregg v. Barnhart, 354 F.3d 710, 713 (8th Cir.2003); Battles v. Shalala, 36 F.3d 43, 44-45 (8th Cir.1994) (<HOLDING>). Christner’s main argument on appeal is that
holding the defendants claim that he was denied the right to testify was appropriate for direct review when the record was adequately developed to permit full consideration of the defendants claim the pertinent facts were undisputed a pcr hearing was not necessary to resolve a factual dispute and would not aid in the application of the law and the defendants claim was presented not as an ineffective assistance of counsel claim but rather as an error committed by the trial court in excluding the defendants testimony which was not an appropriate basis for an ineffective assistance of counsel claim holding that evidence based on new asthma attacks that occurred after alj hearing as immaterial to present application for benefits holding that a claimants failure to list an impairment either in her application for disability benefits or through her testimony disposes of the claim because the alj was under no obligation to investigate a claim not presented at the time of the application for benefits and not offered at the hearing as a basis for disability recognizing that an alj has a duty to ensure that an adequate record is developed during the disability hearing consistent with the issues raised  recognizing that the alj has an obligation to investigate a claim not presented in the application for benefits when testimony at the hearing places him on notice of the need for further inquiry